Everyday calculators

Exact age in years, months, days and total time lived.

Convert oven recipes to air fryer time and temperature.

Tank volume, stocking level and water changes.

Count or add working days, skipping weekends.

Annual CO₂e from driving, flying, home and diet.

Cat years converted to human years.

Daily calories your cat needs by weight, age and neuter status.

Wall shelf spacing your cat can actually climb.

Cat tree height, platform size and base for your cats.

Right amount of coffee grounds for your brew.

Cups, tablespoons, millilitres, grams and ounces.

Copy-and-paste cursive, script and calligraphy fonts.

Add or subtract days, weeks, months or years from a date.

Days, weeks, months and business days between two dates.

Roll any dice notation, with modifiers and totals.

Dog years in human terms, adjusted for size.

Daily calories and cups for your dog's weight.

Air time and gate-to-gate duration for any distance.

How long jet lag will last and how to adjust.

Water, salt and yeast from flour weight and hydration %.

Weaknesses, resistances and immunities for any single or dual type.

Predict your puppy's adult weight from its current age and weight.

Scale any recipe up or down by servings.

Ring size from finger circumference or diameter.

Fuel, tolls and time for a driving trip.

Days used and days left in the rolling 180-day window.

US, UK, EU and centimetre shoe sizes.

Turn baker's percentages into exact gram weights for flour, water, starter and salt.

Fair shares when people owe different amounts.

Total hours worked from clock in/out times.

Add, subtract and convert hours, minutes and seconds.

Local arrival time and the best window to call.

Total trip cost and daily spend.

Compare which pack size is genuinely cheaper.

Words, characters, sentences and reading time.