PRELIMINARY ENGINEERING TOOL
Amps to kWh calculator
Estimate electricity units for one steady operating interval; a meter is needed to measure actual consumption.
Inputs
Calculation steps
E = √3 × 415 V × 20 A × 0.8 PF × 8 h / 1000 = 92.007 kWh
Formula ID: ENERGY_THREE_PHASE_V1
- system
- three-phase
- voltageV
- 415
- currentA
- 20
- powerFactor
- 0.8
- hours
- 8
- timeS
- 28800
- factor
- 1.7320508
- apparentPowerVA
- 14376.022
- activePowerW
- 11500.817
- energyJ
- 331223540
Intermediate values are retained without display rounding in the calculation.
Assumptions and references
Current, voltage and power factor are assumed constant for the entered hours. For a changing load, calculate separate intervals or use a suitable energy meter. No tariff, fixed charge or power-factor penalty is included.
Read the 230 V and 415 V examples →UNDERSTAND THE TOOL
What this calculator does
Convert a representative electrical current into estimated active power and energy over an entered operating interval. One instantaneous reading is not a measured energy total.
How to use it
- Choose DC, single phase or balanced three phase.
- Enter current and voltage from the same operating condition.
- Enter AC power factor and the hours for which that condition is representative.
- Review kW, kWh, assumptions and the calculation trace.
Fields and meanings
- Current
- Representative operating current, not automatically the equipment nameplate value.
- Voltage
- Across the load for single phase or line-to-line for balanced three phase.
- Power factor
- Needed for active AC power; not used for DC.
- Operating hours
- Time spent at the entered operating point. Changing loads need separate intervals.
Review required. This estimates energy only for a steady interval. It does not measure consumption, model a load profile or calculate a tariff bill.
Read the full explanation →