Electrical & digital
Single & three-phase AC power Calculator
Compute real, apparent and reactive power for a balanced AC load. This free single & three-phase ac power calculator shows the calculation and its assumptions so you can compare your own figures.
Calculated on your device
Your results
Real Power KW3.496 kW
Compute real, apparent and reactive power for a balanced AC load.
Apparent Power KVA3.68 kVA
Calculated outcomes
- Reactive Power KVAR
- 1.1491 kVAr
Assumptions and estimates
- Single-phase P=VI×power factor; balanced three-phase P=√3×line voltage×line current×power factor. Assumes sinusoidal AC and balanced phases. This is a power calculation, not cable, breaker or electrical-installation design.
- Method: Single phase: S=VI; balanced three phase: S=√3VI; P=S×PF; Q=√(S²−P²).
- Editable inputs are planning assumptions; check the method and result notes for scope.
Useful next steps
- Use Compare options to test an alternative side by side.
- Copy, print or download a record of this calculation when you need one.
Reports open your email app addressed to s@s1.ie with the public page address only. Your inputs are never added.
How the single & three-phase ac power calculation works
Single phase: S=VI; balanced three phase: S=√3VI; P=S×PF; Q=√(S²−P²).
Editable inputs are planning assumptions; check the method and result notes for scope.
Using this calculator
- Enter your own figures in the labelled inputs. Keep the currencies, units and time periods consistent.
- Choose any applicable rate profile, pattern or assumption shown for this tool. Open additional inputs when relevant.
- Review real power kw and apparent power kva, then read the stated assumptions and eligibility conditions before using the result.
Worked example
This is a static example using illustrative inputs, not facts about you or today’s date. The displayed eligibility selections and assumptions apply only to this example.
See example inputs
- RMS voltage / line voltage (V)
- 230
- RMS current / line current (A)
- 16
- Power factor
- 0.95
- Balanced three-phase load
- No
- Real Power KW
- 3.496 kW
- Apparent Power KVA
- 3.68 kVA