Calculator Hub
Electric Calculators
This page groups practical electrical calculators and converters for quick estimates, fast checks, and simple engineering reference use.
Where to start
If you want a basic power estimate
Start with the Power Calculator.
If you are working with a three-phase load
Use the 3 Phase Power Calculator.
If you want to convert amps to watts
Use the Amps to Watts Calculator.
If you want to convert kVA to kW
Use the kVA to kW Calculator.
If you want a rough electricity bill estimate
Use the Electricity Cost Calculator.
If you want to estimate battery backup time
Use the Battery Runtime Calculator.
Electrical calculation paths
Most electrical estimates start with one known value and then move to the next practical question: watts, kW, three-phase power, apparent power, cost, or runtime.
| Starting point | Use this tool | Next useful step |
|---|---|---|
| Volts and amps | Power Calculator | Convert the watt result to cost or compare it with equipment ratings. |
| Current in amps | Amps to Watts Calculator | Choose DC, single-phase, or three-phase before comparing kW. |
| Balanced three-phase load | 3 Phase Power Calculator | Use line voltage, current, and power factor for amps to kW. |
| kVA rating | kVA to kW Calculator | Apply power factor before comparing real power in kW. |
| Known power and usage time | Electricity Cost Calculator | Estimate kWh and cost from the power result. |
Power Estimation
Tools for estimating electrical power in single-phase and three-phase systems.
- Power CalculatorCalculate electrical power using voltage, current, and power factor.
- Amps to Watts CalculatorConvert amps to watts using voltage and current type for DC, single-phase, and three-phase loads.
- 3 Phase Power CalculatorEstimate three-phase electrical power from voltage, current, and power factor.
Cost and Runtime
Tools for estimating electricity cost and battery operating time.
- Electricity Cost CalculatorEstimate electricity usage and cost using power, time, and kWh rate.
- Battery Runtime CalculatorEstimate battery runtime using battery voltage, capacity, and load power.
Conversion Tools
Tools for converting between common power-related units.
- kVA to kW CalculatorConvert apparent power in kVA to real power in kW using power factor.
- kW to HP ConverterConvert kilowatts to horsepower and horsepower to kilowatts.
Important note
These calculators are intended for quick estimation and general reference. They are useful for fast checks, but they are not a replacement for detailed engineering review, code compliance, manufacturer documentation, or final design verification.