Convert amps to kVA for single-phase or three-phase power from current and voltage, or convert kVA to amps. Common voltages are listed for quick entry.
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kVA from Amps Formula
The formula below applies to single-phase apparent power. For balanced three-phase power, multiply it by √3.
kVA = I × V / 1000
Variables:
- kVA is the kVA from Amps ((kilo-volt-amps))
- I is RMS current (amps); for three-phase, use line current.
- V is RMS voltage (volts); for three-phase, use line-to-line voltage.
For single-phase, multiply RMS current by RMS voltage and divide by 1000. For balanced three-phase, kVA = √3 × line current × line-to-line voltage / 1000. kVA is apparent power; power factor is needed to determine real power in kW.
| Amperes (A) | Volts (V) | Apparent Power (kVA) |
|---|---|---|
| 1 | 120 | 0.120 |
| 2 | 120 | 0.240 |
| 3 | 120 | 0.360 |
| 5 | 120 | 0.600 |
| 7.5 | 120 | 0.900 |
| 10 | 120 | 1.200 |
| 12 | 120 | 1.440 |
| 15 | 120 | 1.800 |
| 20 | 120 | 2.400 |
| 30 | 120 | 3.600 |
| 1 | 240 | 0.240 |
| 2 | 240 | 0.480 |
| 5 | 240 | 1.200 |
| 10 | 240 | 2.400 |
| 15 | 240 | 3.600 |
| 20 | 240 | 4.800 |
| 30 | 240 | 7.200 |
| 40 | 240 | 9.600 |
| 50 | 240 | 12.000 |
| 60 | 240 | 14.400 |
| Single‑phase formula: kVA = (V × A) ÷ 1000. Examples above use common voltages (120 V and 240 V). For other voltages, adjust V accordingly. | ||
How to Calculate kVA from Amps?
The following steps outline how to calculate the kVA from Amps.
- First, determine RMS current (line current for three-phase).
- Next, determine RMS voltage (line-to-line for three-phase).
- Use kVA = I * V / 1000 for single-phase, or multiply by √3 for balanced three-phase.
- Finally, calculate the kVA from Amps.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use these single-phase RMS values as an example problem.
total current (amps) = 30
total voltage (volts) = 20
kVA = 30 * 20 / 1000 = 0.6 kVA
