Electrical and everyday calculators
Instant results, no sign-up, and the formula behind every answer. All calculations run on your device.
Electrical & energy
- Wire size calculatorMinimum wire gauge by ampacity and voltage drop.
- Voltage drop calculatorVolts and % lost in the wire.
- Circuit breaker size calculatorBreaker amps and trip curve.
- AWG ↔ mm² converterAmerican wire gauge to metric size.
- Ohm's law calculatorVolts, amps, ohms and watts.
- Watts to amps and amps to wattsW ↔ A for DC, single and three-phase.
- kW, HP, metric HP, kVA and amps converterkW ↔ HP ↔ kVA ↔ A.
- Power factor correction calculatorkVAR and µF to correct the power factor.
- Torque, power and RPM calculatorN·m, kW/HP and RPM.
- Motor speed calculator (poles, Hz, VFD)RPM from poles, Hz and VFD.
- Solar panel calculatorPanels, kW, production and savings.
- Solar battery calculatorkWh, Ah and battery bank layout.
- Appliance electricity cost calculatorkWh and cost per month and year.
Plumbing & hydraulics
- Water pump power calculatorHP and kW from flow and head.
- Pipe friction loss calculatorHead loss and velocity.
- Pipe size calculatorMinimum diameter and standard pipe.
- Pressure and head converterpsi ↔ bar ↔ ft of head ↔ kPa.
- Tank volume and fill time calculatorLiters, gallons and fill time.
- Booster pump sizing for buildingsPeak flow and pump pressure.
- Drip irrigation calculatorFlow, emitters and water use.
Construction & engineering
Math
- Percentage calculator% of, % ratio and % change.
- Proportion calculator (rule of three)Direct and inverse proportions.
- LCM and GCF calculatorLCM, GCF and prime factors.
- Quadratic equation solverRoots of ax² + bx + c = 0.
- Right triangle calculatorPythagoras, angles and area.
- Area and volume calculator2D shapes and 3D solids.