Knowing the voltage helps verify system compatibility, select proper insulation, and ensure safe operation. This tool derives voltage from the apparent power and current ratings.
3Φ: kV = kVA ÷ (A × √3). 1Φ: kV = kVA ÷ A.
Verify system voltage class, select insulation ratings, and confirm compatibility.
Transformer verification, cable voltage rating, switchgear selection.
kVA (apparent power), Amps (current), Phase (1Φ/3Φ), kV (voltage).
Derive voltage from power and current.
For 3-phase. Single-phase: kV = kVA ÷ Amps. Result is line-to-line voltage in kV.
3 steps to find voltage.
Find the apparent power rating of the equipment.
Measure or find the rated current in amperes.
For 3Φ: kVA ÷ (A × 1.732). For 1Φ: kVA ÷ A.
Voltage at various current levels.
| kVA | 50 A | 100 A | 200 A | 500 A | 1000 A |
|---|---|---|---|---|---|
| 10 | 0.115 | 0.058 | 0.029 | 0.012 | 0.006 |
| 50 | 0.577 | 0.289 | 0.144 | 0.058 | 0.029 |
| 100 | 1.155 | 0.577 | 0.289 | 0.115 | 0.058 |
| 500 | 5.774 | 2.887 | 1.443 | 0.577 | 0.289 |
| 1000 | 11.547 | 5.774 | 2.887 | 1.155 | 0.577 |
| 5000 | 57.74 | 28.87 | 14.43 | 5.774 | 2.887 |
Voltage calculation scenarios.
500 kVA at 139 A (3Φ):
500 ÷ (139 × 1.732) = 2.08 kV
1000 kVA at 100 A (3Φ):
1000 ÷ (100 × 1.732) = 5.77 kV
100 kVA at 240 A (1Φ):
100 ÷ 240 = 0.417 kV (417V)
25 free conversion tools — each with its own unique calculator, interactive visuals, and detailed explanations.
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Converter for kva-to-kw-3-phase
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Converter for kva-to-kv
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Converter for watts-to-kwh
Converter for voltage-drop-calculator
Questions about finding voltage from kVA.
No. You also need the current (amps) and phase to calculate voltage.
Kilovolts — 1 kV = 1,000 volts. Used for medium and high voltage systems.
The √3 (1.732) factor relates line-to-line voltage to the phase voltage in 3Φ systems.
Low: <1 kV. Medium: 1–35 kV. High: 35–230 kV. Extra-high: >230 kV.
Knowing the voltage class ensures you select transformers with proper insulation and tap ranges.
The formula gives line-to-line voltage for 3-phase systems.