Engineering calculators

19 free engineering tools, each with the formula and step-by-step working.

• Air Changes Per Hour CalculatorVentilation rate for a room.
• Beam Load CalculatorBending moment and deflection for a beam.
• Belt Length CalculatorV-belt length between two pulleys.
• Column Buckling CalculatorEuler critical buckling load.
• Duct Size CalculatorDuct diameter for a target airflow.
• Gear Ratio CalculatorRatio, output speed and torque.
• Heat Transfer CalculatorConduction heat loss through a wall.
• HVAC Load CalculatorCooling load in BTU and tons.
• LED Resistor CalculatorSeries resistor for any LED.
• Pipe Velocity CalculatorFlow velocity and pipe sizing.
• Power Factor Correction CalculatorCapacitor kVAr needed to fix power factor.
• Pump Flow Rate CalculatorFlow, head and hydraulic power.
• RC Time Constant CalculatorCharge time and cutoff frequency.
• Resistor Value CalculatorResistance from band values and tolerance.
• RPM to Speed CalculatorVehicle speed from engine RPM.
• Sound Level CalculatorCombine decibels and distance loss.
• Thermal Expansion CalculatorLength change with temperature.
• Three Phase Power CalculatorkW, kVA and current for 3-phase loads.
• Transformer Turns Ratio CalculatorVoltage, current and turns for a transformer.

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