Instantly convert kilovolt-amps (kVA) to amperes (A) for electrical system design, generator sizing, and circuit protection planning. Our free calculator supports single-phase (120V/240V) and three-phase (208V/400V/480V) systems with optional power factor adjustment. Used by electricians, engineers, and facility managers worldwide.
kVA to Amps Calculator
Current (A): —
Pro Tip: For three-phase systems, always use line-to-line voltage (e.g., 400V, not 230V). If your load has a known power factor below 1.0, enter it for more accurate real-world current estimation.
Popular kVA to Amps Conversions
Based on standard voltages. For custom values, use the calculator above.
Single-Phase @ 240V
5 kVA → 20.8 A
10 kVA → 41.7 A
25 kVA → 104.2 A
50 kVA → 208.3 A
Three-Phase @ 400V
5 kVA → 7.2 A
10 kVA → 14.4 A
25 kVA → 36.1 A
50 kVA → 72.2 A
Three-Phase @ 480V (US Industrial)
10 kVA → 12.0 A
25 kVA → 30.1 A
75 kVA → 90.2 A
100 kVA → 120.3 A
How to Convert kVA to Amps: Step-by-Step Guide
Step 1: Identify Your System Type
Determine if your electrical system is single-phase (common in homes/small businesses) or three-phase (industrial/commercial). This choice changes the conversion formula.
Step 2: Note the System Voltage
Find the RMS voltage:
Single-phase: typically 120V, 230V, or 240V (line-to-neutral)
Three-phase: typically 208V, 400V, or 480V (line-to-line) Using the wrong voltage type is the #1 calculation error.
Step 3: Apply the Correct Formula
Single-Phase: Amps = (kVA × 1,000) ÷ Volts
Three-Phase: Amps = (kVA × 1,000) ÷ (√3 × Volts) where √3 ≈ 1.732
Step 4: Account for Power Factor (Optional)
If converting from real power (kW) instead of apparent power (kVA), first calculate: kVA = kW ÷ Power Factor. Typical industrial loads: PF = 0.8–0.95. For pure kVA→Amps conversion, PF = 1.0 is assumed.
kVA to Amps Formulas Explained
Single-Phase Formula
I(A) = S(kVA) × 1,000 ÷ V(V)
Where:
I = Current in Amperes (A)
S = Apparent Power in Kilovolt-Amps (kVA)
V = RMS Voltage in Volts (V)
1,000 = Conversion factor (kilo = 1,000)
Three-Phase Formula (Balanced Load)
I(A) = S(kVA) × 1,000 ÷ (√3 × VL-L(V))
Where:
√3 ≈ 1.732 (accounts for 120° phase displacement)
VL-L = Line-to-Line Voltage (not line-to-neutral) • Assumes balanced load across all three phases
⚠️ Common Mistake: Using line-to-neutral voltage (e.g., 230V) in the three-phase formula instead of line-to-line (400V). This produces results 1.732× too high.
Complete kVA to Amps Conversion Table
Select voltage to view amps for common kVA values. All values rounded to 1 decimal place.
Voltage Options: 240V Single-Phase | 400V Three-Phase | 480V Three-Phase | 208V Three-Phase
| kVA | Amps (Single-Phase @240V) | Amps (Three-Phase @400V) |
|---|---|---|
| 1 | 4.2 A | 1.4 A |
| 5 | 20.8 A | 7.2 A |
| 10 | 41.7 A | 14.4 A |
| 15 | 62.5 A | 21.7 A |
| 25 | 104.2 A | 36.1 A |
| 30 | 125.0 A | 43.3 A |
| 50 | 208.3 A | 72.2 A |
| 75 | 312.5 A | 108.3 A |
| 100 | 416.7 A | 144.3 A |
| 150 | 625.0 A | 216.5 A |
| 250 | 1,041.7 A | 360.8 A |
| 500 | 2,083.3 A | 721.7 A |
Three-phase values assume line-to-line voltage and balanced load. For other voltages, use the calculator above.
Related: Amps to kVA Calculator
FAQS
Q: How many amps is 1 kVA? A: It depends entirely on voltage and phase: • 240V single-phase: 1 kVA = 4.2 A • 400V three-phase: 1 kVA = 1.4 A • 480V three-phase: 1 kVA = 1.2 A Always use the calculator with your specific system parameters for accuracy.
Q: What’s the difference between kVA and kW? A: kVA (kilovolt-amps) measures apparent power—the total power flowing in a circuit. kW (kilowatts) measures real power—the power actually doing useful work. They relate via power factor: kW = kVA × PF. Generators and transformers are rated in kVA because they must handle the total current, regardless of power factor.
Q: Why does three-phase use √3 in the formula? A: In balanced three-phase systems, the 120° phase displacement between conductors means the total power isn’t simply 3× single-phase power. The √3 (≈1.732) factor mathematically accounts for this vector relationship when using line-to-line voltage. It ensures accurate current calculation for breaker and cable sizing.
Q: Is this calculator accurate for engineering design? A: This tool provides preliminary estimates for planning purposes. For final electrical design: ✓ Consult local electrical codes (NEC, IEC, etc.) ✓ Account for continuous load derating (typically 80% rule) ✓ Consider voltage drop, ambient temperature, and conduit fill ✓ Have calculations reviewed by a licensed electrical engineer Never size safety-critical components based solely on online calculators.
Q: How do I include power factor in my calculation? A: Power factor is not used when converting kVA to amps because kVA already represents apparent power. However, if you’re starting with kW (real power), first convert to kVA: kVA = kW ÷ Power Factor. Then use the kVA value in the amps formula.
Why Trust This Calculator?
Engineering-Verified Formulas Calculations follow IEEE/IEC standards for AC power systems. Formulas cross-checked against NFPA 70 (NEC) Appendix D examples.
Real-Time Validation Input validation prevents common errors (negative values, impossible voltages). Results update instantly as you type.
Global Voltage Support Presets for North America (120/208/240/480V), Europe (230/400V), and industrial standards worldwide.
Privacy-Focused No data collection. All calculations happen in your browser—your inputs never leave your device.
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