All calculators
538 free tools across 26 categories. Every one shows the formula and the working, not just a number.
- Finance401(k) CalculatorProject your 401(k) balance at retirement.
- Finance50/30/20 Budget CalculatorSplit take-home pay into needs, wants and savings.
- BusinessA/B Test Significance CalculatorIs your test result real?
- HealthA1C CalculatorConvert A1C to average blood glucose.
- MathAbsolute Value CalculatorDistance from zero, and |ax+b| equations.
- PhysicsAcceleration CalculatorAcceleration from speed change and time.
- EducationACT Score CalculatorRaw scores to an estimated ACT composite.
- BusinessAd Budget Allocation CalculatorSplit budget across channels by efficiency.
- HealthAdjusted Body Weight CalculatorIBW and adjusted weight for dosing.
- BusinessAffiliate Earnings CalculatorAffiliate income from traffic and commission.
- Date & TimeAge CalculatorExact age in years, months, days and total time lived.
- EngineeringAir Changes Per Hour CalculatorVentilation rate for a room.
- Home & DIYAir Conditioner Size CalculatorBTU capacity for a room.
- FoodAir Fryer Conversion CalculatorConvert oven recipes to air fryer time and temperature.
- HealthAlcohol Units CalculatorUnits and standard drinks in a beverage.
- FinanceAmortization CalculatorYear-by-year split of principal versus interest on any loan.
- HealthAnion Gap CalculatorAnion gap with albumin correction and delta ratio.
- FinanceAnnuity CalculatorPayout and value of a fixed annuity.
- MathAntilog CalculatorInverse logarithm for any base.
- TechnologyAPI Rate Limit CalculatorRequests per second your app needs.
- EducationApprenticeship Wage CalculatorApprentice pay per week, month and year.
- FinanceAPR CalculatorTrue yearly cost of a loan including fees.
- FinanceAPY CalculatorEffective yearly yield with compounding.
- ScienceAquarium Heater CalculatorHeater wattage for your tank.
- PetsAquarium Volume CalculatorTank volume, stocking level and water changes.
- MathArc Length CalculatorLength of a circular arc.
- ConversionsArea ConverterSquare feet, metres, acres and hectares.
- MathArithmetic Sequence Calculatornth term and sum of an arithmetic series.
- ConversionsAspect Ratio CalculatorResize while keeping proportions exact.
- Home & DIYAsphalt CalculatorTons of asphalt for a driveway.
- EducationAttendance Percentage CalculatorYour attendance rate, plus how many classes you can still miss.
- TechnologyAudio File Size CalculatorFile size from bitrate and duration.
- FinanceAuto Lease CalculatorMonthly car lease payment breakdown.
- StatisticsAverage CalculatorMean, median, mode and range from a list.
- HealthBaby Weight Percentile CalculatorWhere your baby's weight sits.
- TechnologyBackup Window CalculatorTime to back up your data set.
- FinanceBalloon Payment CalculatorPayments plus the lump sum due at the end.
- TechnologyBandwidth CalculatorBandwidth needed for users and streams.
- ConversionBase ConverterConvert numbers between any bases.
- Home & DIYBaseboard CalculatorLinear feet of trim for a room.
- TechnologyBattery Life CalculatorRuntime from capacity and current draw.
- EngineeringBeam Load CalculatorBending moment and deflection for a beam.
- ScienceBeer-Lambert Law CalculatorAbsorbance, concentration and path length.
- EducationBell Curve Grade CalculatorAssign letter grades on a normal curve.
- EngineeringBelt Length CalculatorV-belt length between two pulleys.
- MathBinary ConverterBinary, decimal, hex and octal in one step.
- StatisticsBinomial Distribution CalculatorProbability of k successes in n trials.
- HealthBlood Alcohol CalculatorEstimated BAC and hours until sober.
- HealthBlood Pressure CalculatorCategory, MAP and pulse pressure.
- HealthBMI CalculatorBody mass index with the healthy weight range for your height.
- HealthBMR CalculatorCalories your body burns at complete rest.
- FinanceBoat Loan CalculatorMonthly payment for a boat purchase.
- HealthBody Fat CalculatorUS Navy method body fat from tape measurements.
- HealthBody Surface Area CalculatorBSA by Mosteller, Du Bois and Haycock formulas.
- FinanceBond Price CalculatorPrice and yield of a fixed-rate bond.
- ScienceBoyle's Law CalculatorPressure and volume at constant temperature.
- BusinessBreak-Even Point CalculatorUnits and revenue needed before you make a profit.
- Home & DIYBTU CalculatorHeating and cooling capacity a room needs.
- BusinessBurn Rate and Runway CalculatorMonths of runway at current burn.
- Date & TimeBusiness Days CalculatorCount or add working days, skipping weekends.
- FinanceBusiness Loan CalculatorRepayments and cost of a business loan.
- BusinessBusiness Valuation CalculatorValue a business on earnings multiples.
- BusinessCafe Break-Even CalculatorCovers per day to break even.
- HealthCaffeine Half-Life CalculatorSee how much caffeine is still in your system at bedtime.
- BusinessCAGR CalculatorCompound annual growth rate between any two values.
- HealthCalorie Deficit CalculatorDaily calories to lose a target amount by a chosen date.
- HealthCalories Burned CalculatorEnergy burnt in any activity using MET values.
- InvestingCapital Gains Tax CalculatorEstimate tax on an investment gain.
- AutoCar Depreciation CalculatorProject your vehicle's value year by year.
- AutoCar Loan CalculatorAuto payment including trade-in, down payment and sales tax.
- HealthCarb CalculatorDaily carbohydrate target.
- EverydayCarbon Footprint CalculatorAnnual CO₂e from driving, flying, home and diet.
- ScienceCarbon Offset CalculatorTrees and cost to offset your emissions.
- Home & DIYCarpet CalculatorSquare yards of carpet and cost.
- BusinessCash Flow Forecast CalculatorClosing balance over the next months.
- PetsCat Age CalculatorCat years converted to human years.
- FinanceCD CalculatorCertificate of deposit maturity value.
- EducationCGPA CalculatorCumulative GPA across all semesters.
- ScienceCharles's Law CalculatorVolume and temperature at constant pressure.
- StatisticsChi Square CalculatorGoodness of fit test statistic.
- HealthChild BMI CalculatorBMI and category for children.
- EducationChild Height PredictorPredicted adult height from parent heights.
- HealthCholesterol Ratio CalculatorTotal to HDL ratio and LDL estimate.
- EverydayChore Split CalculatorFair division of household tasks.
- BusinessChurn Rate CalculatorMonthly and annual churn plus retention.
- Home & DIYCinder Block CalculatorBlocks, mortar and cost for any CMU wall, including waste allowance.
- MathCircle CalculatorArea, circumference and diameter from any one value.
- MathCircumference CalculatorCircle circumference from radius or diameter.
- EducationCitation Page EstimatorPages, words and references for a paper.
- EducationClass Average CalculatorMean, median and spread for a set of scores.
- EducationClass Rank Percentile CalculatorConvert rank in class into a percentile.
- EducationClassroom Seating CalculatorHow many desks fit a room safely.
- Real EstateClosing Cost CalculatorEstimate cash needed to close on a home.
- TechnologyCloud Hosting Cost CalculatorMonthly cloud bill from compute and egress.
- TechnologyCode Review Time CalculatorReview hours from lines changed.
- MathCoin Flip Probability CalculatorOdds of getting a number of heads in N flips.
- EducationCollege Credit CalculatorTrack credits earned and credits left to graduate.
- EngineeringColumn Buckling CalculatorEuler critical buckling load.
- MathCombination and Permutation CalculatornCr, nPr and factorials for counting problems.
- BusinessCommission CalculatorCommission earned on sales.
- ScienceCompost Ratio CalculatorBalance greens and browns for fast compost.
- FinanceCompound Interest CalculatorGrow a lump sum plus regular contributions at any compounding frequency.
- Home & DIYConcrete CalculatorCubic yards and bags for slabs, footings and posts.
- MathCone Volume CalculatorVolume and surface area of a cone.
- StatisticsConfidence Interval CalculatorMargin of error and interval around a sample mean.
- BusinessConsulting Day Rate CalculatorDay rate from your income target.
- BusinessContent Production Cost CalculatorCost per article and cost per organic visit.
- BusinessConversion Rate CalculatorConversion rate, uplift and revenue per visitor.
- FoodCooking Measurement ConverterCups, tablespoons, millilitres, grams and ounces.
- HealthCorrected Calcium CalculatorCalcium adjusted for low albumin.
- StatisticsCorrelation Coefficient CalculatorPearson r for two data sets.
- FinanceCost of Living CalculatorSalary needed in another city.
- Real EstateCost of Moving CalculatorTotal upfront cash to move into a new place.
- BusinessCost Per Unit CalculatorFixed plus variable cost per item.
- Date & TimeCountdown CalculatorTime remaining to any future date.
- BusinessCPC CalculatorCost per click, clicks and CTR.
- EducationCPD Hours CalculatorTrack professional development hours.
- BusinessCPM CalculatorCost per thousand impressions, spend and reach.
- HealthCreatinine Clearance CalculatorCockcroft-Gault kidney function.
- FinanceCredit Card Payoff CalculatorMonths to clear a card balance and the interest it costs.
- EducationCredit Hour Workload CalculatorWeekly hours your course load really needs.
- MathCross Product CalculatorVector cross product in 3D.
- InvestingCrypto Profit CalculatorProfit, ROI and break-even after fees.
- MathCube Root CalculatorCube root of any number.
- FinanceCurrency Conversion Margin CalculatorThe hidden spread your bank charges on a transfer.
- BusinessCustomer Acquisition Cost CalculatorWhat each new customer costs to win.
- BusinessCustomer Lifetime Value CalculatorLTV from spend, frequency and churn.
- GamingD&D HP CalculatorAverage or rolled hit points for any class, level and Constitution score.
- HealthDaily Water Intake CalculatorHow much to drink for your weight, climate and training.
- ConversionsData Storage ConverterBytes, KB, MB, GB and TB, binary or decimal.
- Date & TimeDate Add or Subtract CalculatorAdd or subtract days, weeks, months or years from a date.
- Date & TimeDate Difference CalculatorDays, weeks, months and business days between two dates.
- HealthDays Supply CalculatorPharmacy days-supply for tablets, liquids, inhalers and insulin.
- FinanceDebt Avalanche CalculatorPay highest-rate debt first.
- FinanceDebt Snowball CalculatorTotal payoff time when every freed-up payment rolls into the next debt.
- FinanceDebt-to-Income Ratio CalculatorThe DTI number lenders check before approving you.
- BusinessDebtor Days CalculatorHow long customers take to pay.
- Home & DIYDeck CalculatorBoards, joists and cost for a deck.
- PhysicsDensity CalculatorDensity, mass or volume from the other two.
- BusinessDepreciation CalculatorStraight-line and declining balance schedules.
- MathDeterminant Calculator2×2 and 3×3 matrix determinants.
- WeatherDew Point CalculatorDew point from temperature and humidity.
- GamingDice Probability CalculatorOdds of hitting any total on any number of dice.
- GamingDice RollerRoll any dice notation, with modifiers and totals.
- ScienceDilution CalculatorM1V1 = M2V2 for any dilution problem.
- FinanceDiscount CalculatorSale price and money saved from any percentage off.
- MathDistance Formula CalculatorDistance and midpoint between two coordinates.
- InvestingDividend Yield CalculatorYield, annual income and yield on cost.
- PetsDog Age CalculatorDog years in human terms, adjusted for size.
- PetsDog Food CalculatorDaily calories and cups for your dog's weight.
- InvestingDollar Cost Averaging CalculatorWhat regular investing grows into.
- ScienceDoppler Effect CalculatorObserved frequency for a moving source.
- EducationDorm vs Apartment CalculatorCompare on-campus and off-campus living.
- MathDot Product CalculatorScalar product and angle between vectors.
- EverydayDouble Discount CalculatorStacked discounts and the real saving.
- Real EstateDown Payment CalculatorHow much deposit you need and when.
- ConversionsDownload Time CalculatorHow long a file takes at your connection speed.
- Home & DIYDrywall CalculatorSheets, screws and compound needed.
- EngineeringDuct Size CalculatorDuct diameter for a target airflow.
- HealthDue Date CalculatorEstimated delivery date and pregnancy milestones.
- BusinessEBITDA CalculatorOperating earnings before non-cash items.
- BusinessEcommerce Profit CalculatorNet profit per order after every fee.
- FinanceEffective Tax Rate CalculatorThe share of income you actually pay.
- HealtheGFR CalculatorKidney function estimate from serum creatinine.
- Home & DIYElectricity Cost CalculatorWhat any appliance costs to run per day, month and year.
- MathEllipse CalculatorArea, perimeter and foci of an ellipse.
- BusinessEmail Marketing ROI CalculatorRevenue and ROI from an email campaign.
- FinanceEmergency Fund CalculatorHow big your safety net should be, and how long to build it.
- StatisticsEmpirical Rule CalculatorTurn a mean and standard deviation into the 68%, 95% and 99.7% intervals.
- BusinessEmployee Cost CalculatorTrue cost of hiring beyond salary.
- BusinessEmployee Stock Option CalculatorVested value, spread and exercise cost.
- BusinessEmployee Turnover Cost CalculatorWhat losing a team member really costs.
- BusinessEOQ CalculatorEconomic order quantity and cycle cost.
- BusinessEquity Dilution CalculatorOwnership after a funding round.
- ScienceEscape Velocity CalculatorSpeed needed to leave a gravity well.
- EducationEssay Word Count PlannerSplit a word limit across intro, body and conclusion.
- AutoEV Charging Cost CalculatorCost per charge, per mile, and versus petrol.
- TechnologyEV Range CalculatorReal-world range from battery and efficiency.
- BusinessEvent Ticket Pricing CalculatorTicket price to cover event costs.
- EducationExam Percentile CalculatorYour percentile from mean and standard deviation.
- EducationExam Readiness CalculatorAre your mock scores good enough yet?
- MathExponent CalculatorPowers, roots, scientific notation and logs in one place.
- FinanceExtra Mortgage Payment CalculatorSee how many years and how much interest an extra monthly payment saves.
- MathFactorial Calculatorn! and related combinatorics.
- BusinessFBA Fee CalculatorMarketplace fulfilment fees and take-home.
- FinanceFederal Income Tax CalculatorMarginal and effective tax rate from 2024 brackets.
- HealthFENa CalculatorDistinguish prerenal from intrinsic renal azotemia in seconds.
- Home & DIYFence CalculatorPosts, rails and pickets needed.
- HealthFiber Intake CalculatorDaily fibre target and your gap.
- MathFibonacci CalculatorFibonacci terms and the golden ratio.
- EducationField Trip Cost CalculatorCost per student for a school trip.
- EducationFinal Grade CalculatorThe exam score you need to hit your target grade.
- FinanceFIRE Number CalculatorThe portfolio size that makes work optional, and when you reach it.
- Home & DIYFirewood Cord CalculatorCords in a stack and cost per cord.
- EducationFlashcard Schedule CalculatorDaily card reviews for your deck.
- Home & DIYFlooring CalculatorBoxes of flooring and cost.
- BusinessFood Cost CalculatorMenu food cost percentage and pricing.
- PhysicsForce CalculatorNewton's second law: F = ma.
- MathFraction CalculatorAdd, subtract, multiply and divide fractions with full working.
- MathFraction to Decimal CalculatorConvert fractions to decimals and percentages, both ways.
- BusinessFranchise ROI CalculatorPayback on a franchise investment.
- BusinessFreelance Hourly Rate CalculatorThe rate you must charge to hit your income target.
- ScienceFrequency Wavelength CalculatorConvert between frequency and wavelength.
- AutoFuel Cost CalculatorTrip fuel cost from distance, economy and price.
- FinanceFuture Value CalculatorWhat money today is worth later.
- Home & DIYGarden Soil CalculatorCubic yards of soil or compost for a bed.
- MathGCF and LCM CalculatorGreatest common factor and least common multiple, with prime factors.
- EngineeringGear Ratio CalculatorRatio, output speed and torque.
- Home & DIYGenerator Size CalculatorWatts needed to run your home.
- MathGeometric Sequence Calculatornth term and sum of a geometric series.
- HealthGestational Age CalculatorWeeks pregnant from LMP.
- EverydayGift Budget CalculatorPlan holiday gift spending.
- HealthGlucose Conversion Calculatormg/dL to mmol/L blood sugar.
- HealthGoal Weight Date CalculatorWhen you'll hit your target at your current rate.
- FunGolden Birthday CalculatorThe year you turn the same age as your birth date — plus how far away it is.
- EducationGPA CalculatorWeighted GPA from grades and credit hours.
- EducationGPA Improvement CalculatorGrades needed to raise your GPA.
- EducationGPA to Percentage CalculatorConvert between GPA, percentage and letter grade.
- EducationGrade Curve CalculatorApply flat, top-score or square-root curves to a raw score instantly.
- EducationGrade Needed CalculatorThe score you need on what's left.
- EducationGrade to Percentage ConverterLetter grade, GPA point and percentage in one view.
- MathGraphing CalculatorPlot any function instantly, with roots, extrema and a value table.
- Home & DIYGravel CalculatorTons and cubic yards of gravel for any area.
- ScienceGravitational Force CalculatorNewton's law of universal gravitation.
- ScienceGreenhouse Heating CalculatorHeater size to hold your target temperature.
- BusinessGross Profit CalculatorRevenue minus cost of goods sold.
- FinanceGross to Net CalculatorConvert gross pay into take-home pay.
- ScienceHalf-Life CalculatorRemaining amount after any number of half-lives.
- ScienceHarvard Composition CalculatorWork out mass percent composition the Harvard chemistry way, step by step.
- MathHarvard Graphing CalculatorThe Harvard-style online function plotter: graph f(x) with roots, extrema and a value table.
- TechnologyHash Collision CalculatorBirthday-problem collision odds.
- HealthHeart Rate Zone CalculatorFive training zones from your max and resting heart rate.
- WeatherHeat Index CalculatorApparent temperature from heat and humidity.
- EngineeringHeat Transfer CalculatorConduction heat loss through a wall.
- Real EstateHELOC CalculatorHow much home equity you can borrow.
- MathHexagon Area CalculatorRegular hexagon area and perimeter.
- EducationHomework Time CalculatorNightly homework load by grade.
- FinanceHourly to Salary CalculatorConvert an hourly rate into weekly, monthly and annual pay.
- FinanceHouse Affordability CalculatorThe price range your income and debts actually support.
- EngineeringHVAC Load CalculatorCooling load in BTU and tons.
- MathHyperbola CalculatorCenter, vertices, foci, eccentricity and asymptotes from a, b and the center.
- ChemistryIdeal Gas Law CalculatorSolve PV = nRT for any unknown.
- HealthIdeal Weight CalculatorFour classic formulas plus the healthy BMI range.
- FinanceInflation CalculatorWhat money today will be worth later, and vice versa.
- BusinessInfluencer Rate CalculatorFair sponsored post pricing by reach.
- Home & DIYInsulation CalculatorBatts or rolls needed by R-value.
- HealthInsulin Dose CalculatorMeal bolus and correction dose.
- HealthIntermittent Fasting CalculatorFasting and eating window schedule.
- StatisticsInterquartile Range CalculatorIQR, quartiles and outlier fences.
- BusinessInventory Turnover CalculatorHow fast stock sells through.
- BusinessInvoice Total CalculatorLine totals, tax, discount and the amount due.
- TechnologyIP Address Range CalculatorAddress counts across prefixes.
- FinanceIRR CalculatorInternal rate of return on cash flows.
- HealthIV Drip Rate CalculatorDrops per minute for an infusion.
- HealthJet Lag Recovery CalculatorHow many days to adjust, and when to seek light.
- TravelJet Lag Recovery CalculatorHow long jet lag will last and how to adjust.
- BusinessJob Quote CalculatorPrice a job with labour, materials and margin.
- HealthKeto Macro CalculatorKetogenic fat, protein and carb split.
- BusinessKeyword Opportunity CalculatorScore keywords by traffic value versus difficulty.
- PhysicsKinetic Energy CalculatorEnergy of a moving object, and stopping distance.
- EducationLanguage Fluency Hours CalculatorHours and months to reach your target level.
- BusinessLate Payment Interest CalculatorStatutory interest on overdue invoices.
- MathLaw of Cosines CalculatorSolve triangles with two sides and an angle.
- MathLaw of Sines CalculatorSolve triangles from angles and a side.
- Home & DIYLawn Fertilizer CalculatorHow many pounds of product your lawn needs.
- HealthLean Body Mass CalculatorEverything that isn't fat: muscle, bone, organs and water.
- AutoLease vs Buy CalculatorCompare the true cost of leasing against buying the same car.
- EngineeringLED Resistor CalculatorSeries resistor for any LED.
- ConversionsLength ConverterMetres, feet, miles, inches and more in one place.
- ScienceLens Equation CalculatorFocal length, image distance and magnification.
- EducationLesson Plan Timing CalculatorSplit a class period across activities.
- ScienceLight Travel Time CalculatorHow long light takes to cross a distance.
- StatisticsLinear Regression CalculatorBest fit line for paired data.
- FinanceLoan Comparison CalculatorCompare two loan offers side by side.
- FinanceLoan Payment CalculatorMonthly payment, total interest and payoff total for any fixed-rate loan.
- Real EstateLoan to Value CalculatorLTV ratio for a mortgage.
- MathLogarithm Calculatorlog base 10, natural log and any custom base.
- BusinessLoyalty Points Value CalculatorWhat your points are actually worth.
- HealthMacro CalculatorProtein, carbs and fat grams for your calorie target.
- StatisticsMargin of Error CalculatorThe ± figure behind any poll or survey result.
- BusinessMarkdown CalculatorSale price, markdown percent and remaining margin in one view.
- EducationMarking Time CalculatorHours to mark a set of papers.
- BusinessMarkup CalculatorSet a selling price from cost and target markup.
- HealthMeal Calorie CalculatorCalories from macros in a meal.
- MathMean Value Theorem CalculatorFind every c in (a, b) where the instantaneous rate equals the average rate of change.
- BusinessMeeting Cost CalculatorThe salary cost of that meeting.
- BusinessMenu Pricing CalculatorMenu price from food cost percentage.
- HealthMetabolic Age CalculatorCompare your BMR to age norms.
- HealthMETs CalculatorExercise intensity and calories from METs.
- MathMidpoint CalculatorMidpoint between two coordinates.
- MathMixed Number CalculatorConvert and add mixed numbers.
- MathModulo CalculatorRemainder after division.
- ScienceMolar Mass CalculatorGrams per mole and mole conversions.
- ScienceMolarity CalculatorMoles, mass and concentration for any solution.
- ScienceMomentum CalculatorMomentum, impulse and force.
- Home & DIYMortar CalculatorBags of mortar for block or brick.
- FinanceMortgage Payment CalculatorPrincipal, interest, tax and insurance in one monthly figure.
- Real EstateMortgage Payoff CalculatorPay off your mortgage years early.
- AutoMPG CalculatorReal fuel economy from your own fill-ups.
- BusinessMRR and ARR CalculatorRecurring revenue with growth projection.
- Home & DIYMulch CalculatorBags or yards of mulch for your beds.
- FinanceNet Present Value CalculatorDiscounted value of future cash flows.
- FinanceNet Worth CalculatorAssets minus liabilities.
- StatisticsNormal Distribution CalculatorProbabilities under the bell curve.
- BusinessNPS CalculatorNet promoter score from survey responses.
- ScienceOhm's Law CalculatorVoltage, current, resistance and power from any two.
- HealthOne Rep Max CalculatorEstimated 1RM plus a full percentage training table.
- EducationOnline Course Pricing CalculatorPrice your course to hit a revenue goal.
- BusinessOperating Leverage CalculatorHow profit reacts to sales changes.
- ScienceOrbital Period CalculatorKepler's third law for any orbit.
- FinanceOregon Kicker CalculatorEstimate your Oregon surplus refund credit from your prior-year tax liability.
- FoodOven Temperature ConverterCelsius, Fahrenheit, fan and gas mark equivalents.
- FinanceOvertime Pay CalculatorTime-and-a-half, double time and total weekly gross.
- HealthOvulation CalculatorFertile window and ovulation day from your cycle.
- HealthPack Year CalculatorSmoking history in pack years.
- Home & DIYPaint CalculatorGallons needed for walls, doors and windows deducted.
- ScienceParallel Resistor CalculatorTotal resistance in parallel and series.
- MathPartial Derivative CalculatorNumeric partial derivatives of multivariable functions at a point, including gradients.
- BusinessPartnership Profit Split CalculatorSplit profit by capital, hours or agreement.
- EducationPass Rate CalculatorCohort pass rate and students at risk.
- TechnologyPassword Entropy CalculatorEntropy bits and crack time.
- BusinessPayback Period CalculatorHow long to recover an investment.
- FinancePaycheck CalculatorEstimate take-home pay after tax and deductions.
- BusinessPayroll Tax CalculatorEmployer and employee payroll tax.
- HealthPediatric Dose CalculatorWeight-based dosing for children.
- FinancePension CalculatorDefined benefit pension income.
- SciencePercent Composition CalculatorMass percent of each element, or of a solute in a solution.
- MathPercent Error CalculatorExperimental accuracy against a true value.
- SciencePercent Yield CalculatorActual vs theoretical reaction yield.
- MathPercentage CalculatorPercent of a number, percent change and 'X is what % of Y'.
- MathPercentage Change CalculatorIncrease, decrease and percentage-point difference.
- MathPercentage Increase CalculatorGrowth or decline between two values, in percent.
- MathPermutation CalculatorOrdered arrangements nPr.
- FinancePersonal Loan CalculatorUnsecured loan payment and interest.
- EverydayPet Food Cost CalculatorMonthly and yearly pet food spend.
- SciencepH Adjustment CalculatorAcid or base needed to shift pH.
- ChemistrypH CalculatorpH, pOH and ion concentrations.
- MathPiecewise Function CalculatorEvaluate and graph piecewise-defined functions, and test continuity at a point.
- EngineeringPipe Velocity CalculatorFlow velocity and pipe sizing.
- Real EstatePMI CalculatorPrivate mortgage insurance cost.
- StatisticsPoisson Distribution CalculatorProbability of k events in an interval.
- GamingPokémon Type CalculatorWeaknesses, resistances and immunities for any single or dual type.
- EducationPomodoro CalculatorPomodoros, breaks and total time for a task.
- Home & DIYPool Volume CalculatorGallons in a pool, plus chlorine dosing.
- EngineeringPower Factor Correction CalculatorCapacitor kVAr needed to fix power factor.
- HealthPregnancy Due Date CalculatorDue date and trimester milestones from your last period.
- HealthPregnancy Weight Gain CalculatorRecommended gain by BMI and week.
- FinancePresent Value CalculatorWhat future money is worth today.
- ConversionPressure ConverterConvert psi, bar, kPa, atm and mmHg.
- Real EstatePrice Per Square Foot CalculatorCompare homes on price per square foot.
- MathPrime Factorization CalculatorBreak any number into its prime building blocks.
- TechnologyPrint Size CalculatorMaximum print size from image pixels.
- StatisticsProbability CalculatorCombined probability of independent events.
- BusinessProductivity CalculatorOutput per hour, labour productivity rate and productive-time percentage.
- BusinessProfit Margin CalculatorGross, net and markup from revenue and cost.
- BusinessProfit Margin CalculatorGross, operating and net margin from revenue.
- BusinessProject Fee CalculatorCompare hourly billing with a fixed fee.
- TechnologyProject Timeline CalculatorDuration with buffer and part-time staff.
- ScienceProjectile Motion CalculatorRange, height and flight time.
- ScienceProjectile Range CalculatorRange, height and flight time.
- Real EstateProperty Tax CalculatorAnnual and monthly property tax.
- HealthProtein Intake CalculatorDaily protein target based on weight and training.
- HealthPulse Pressure CalculatorDifference between systolic and diastolic.
- EngineeringPump Flow Rate CalculatorFlow, head and hydraulic power.
- BusinessPurchase Order CalculatorLanded cost of an import order.
- MathPyramid Volume CalculatorVolume and surface area of a pyramid.
- MathPythagorean Theorem CalculatorSolve for any missing side of a right triangle.
- MathQuadratic Formula CalculatorRoots, vertex and discriminant for ax² + bx + c.
- StatisticsQuartile CalculatorQ1, median, Q3 and five number summary.
- BusinessQuota Attainment CalculatorPace against target and pipeline needed.
- FitnessRace Time PredictorPredict race times from a recent result.
- MathRadical Form CalculatorSimplify square and nth roots to exact radical form, with the decimal value.
- ScienceRadioactive Decay CalculatorRemaining activity after any time.
- TechnologyRAID Capacity CalculatorUsable capacity and fault tolerance.
- ScienceRainwater Collection CalculatorLitres collected from your roof.
- Home & DIYRainwater Harvesting CalculatorWater you can collect from your roof.
- MathRandom Number GeneratorRandom integers in any range, with or without repeats.
- MathRatio CalculatorSimplify ratios, scale them and solve for a missing term.
- EngineeringRC Time Constant CalculatorCharge time and cutoff frequency.
- EducationReading Level CalculatorFlesch reading ease and grade level.
- EducationReading Log CalculatorPages per day to finish by a deadline.
- EverydayReading Time CalculatorHow long a word count takes to read or speak.
- Home & DIYRebar CalculatorRebar length and tie count for a slab.
- FoodRecipe Scaling CalculatorScale any recipe up or down by servings.
- BusinessRecruitment Funnel CalculatorApplicants needed to make a hire.
- MathRectangle Area CalculatorArea, perimeter and diagonal.
- FinanceRefinance Break-Even CalculatorHow many months until a refinance pays for itself.
- MathRelative Extrema CalculatorLocate local maxima, local minima and inflection points on any interval.
- Real EstateRent Affordability CalculatorHow much rent you can realistically afford.
- FinanceRent vs Buy CalculatorWhich is cheaper over the years you plan to stay.
- Real EstateRental Yield CalculatorGross and net yield on a rental.
- EngineeringResistor Value CalculatorResistance from band values and tolerance.
- BusinessRetainer Pricing CalculatorMonthly retainer that stays profitable.
- FinanceRetirement Savings CalculatorProjected nest egg and the income it can support.
- BusinessRevenue Per Employee CalculatorProductivity benchmark for your team.
- ScienceReynolds Number CalculatorLaminar or turbulent flow test.
- EverydayRing Size CalculatorRing size from finger circumference or diameter.
- TravelRoad Trip Cost CalculatorFuel, tolls and time for a driving trip.
- BusinessROAS CalculatorReturn on ad spend and break-even ROAS.
- BusinessROI CalculatorReturn on investment, plus the annualised rate.
- MathRolle's Theorem CalculatorCheck the hypotheses and find every c in (a, b) with f′(c) = 0.
- MathRoman Numeral ConverterNumbers to Roman numerals and back.
- Home & DIYRoof Pitch CalculatorPitch, angle, rafter length and roof area.
- FinanceRoth IRA CalculatorTax-free retirement growth projection.
- MathRounding CalculatorRound to decimals, whole numbers or any nearest multiple.
- EngineeringRPM to Speed CalculatorVehicle speed from engine RPM.
- EducationRubric Score CalculatorWeighted rubric criteria into one grade.
- HealthRucking Calorie CalculatorCalories burned rucking, using the Pandolf load-carriage equation.
- FinanceRule of 72 CalculatorHow long money takes to double.
- HealthRunning Pace CalculatorPace, finish time and splits for any distance.
- BusinessSaaS Pricing CalculatorPrice per seat to hit margin targets.
- BusinessSafety Stock CalculatorBuffer stock and reorder point.
- FinanceSalary to Hourly CalculatorWhat your annual salary really works out to per hour.
- BusinessSales Growth CalculatorGrowth rate between two periods.
- FinanceSales Tax CalculatorAdd or remove sales tax from any price.
- StatisticsSample Size CalculatorHow many responses you need for a reliable survey.
- EducationSAT Score CalculatorRaw answers to an estimated 400–1600 SAT score.
- HealthSauna Calorie CalculatorEstimate calories burned during a sauna session from weight, temperature and time.
- FinanceSavings Goal CalculatorHow much to set aside each month to hit a target by a deadline.
- EducationScholarship Value CalculatorWhat an award is really worth over a degree.
- EducationSchool Choice Score CalculatorScore schools against what matters to you.
- EducationSchool Fundraiser CalculatorUnits to sell to hit a fundraising goal.
- EducationSchool Run Time CalculatorLeave time for the school run.
- EducationSchool Supplies Budget CalculatorBack-to-school cost per child.
- EducationSchool Year Days CalculatorInstructional days left this year.
- MathScientific Notation ConverterConvert between standard form and decimal notation.
- TechnologyScreen PPI CalculatorPixel density and viewing distance.
- MathSector Area CalculatorArea of a pie slice of a circle.
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