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Engineering calculations, answered at a glance

Free, fast and checked calculators for engineers, builders, students and homeowners. Each tool shows its formula, a worked example and the standard or textbook it comes from. Your numbers never leave your device.

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Picked by our team: one common first question from each branch. Not based on visitor counts.

Concrete Mix Calculator: Cement, Sand and AggregateConcrete MixCement bags, sand and aggregate for a volume of concreteRebar Weight Calculator (Steel Bar Weight per Metre)Rebar WeightWeight of reinforcement bars by diameter, length and countBrick and Block Calculator for a WallBricks & BlocksHow many bricks or blocks a wall needs, and the mortarAC Size Calculator: Room Area to BTU and TonsAC SizeAir conditioner size for a room, in BTU/h and tonskVA, kW and Amps Calculator (Single and Three Phase)kVA · kW · AmpsConvert between amps, kW and kVA with power factor

Civil & construction Concrete, reinforcement, brickwork

Brick and Block Calculator for a WallBricks & BlocksHow many bricks or blocks a wall needs, and the mortarConcrete Mix Calculator: Cement, Sand and AggregateConcrete MixCement bags, sand and aggregate for a volume of concreteRebar Weight Calculator (Steel Bar Weight per Metre)Rebar WeightWeight of reinforcement bars by diameter, length and count

Electrical Power, current, kVA and kW

kVA, kW and Amps Calculator (Single and Three Phase)kVA · kW · AmpsConvert between amps, kW and kVA with power factor

Mechanical & HVAC Air conditioning and cooling

AC Size Calculator: Room Area to BTU and TonsAC SizeAir conditioner size for a room, in BTU/h and tons

Coming soon What we are building next. Tell us which one you need first.

PlannedVoltage Drop CalculatorVoltage drop along a copper or aluminium cableI want this
PlannedOhm's Law and Power CalculatorVoltage, current, resistance and power from any twoI want this
PlannedBattery Backup Time CalculatorHow long a UPS or inverter battery runs a loadI want this
PlannedSteel Plate and Section Weight CalculatorWeight of steel plates, flats, angles and sectionsI want this

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