kVA and kW to Amps Chart (Single and Three Phase)
Full-load current for standard transformer and generator sizes at common voltages, calculated from I = kVA × 1000 ÷ (√3 × V) for three-phase and I = kVA × 1000 ÷ V for single-phase. Use the calculator for any other size, voltage or power factor.
kVA, kW and amps calculator
601.4 A
500 kVA = 400 kW at power factor 0.8 (three-phase, 480 V)
I = kVA × 1000 ÷ (√3 × V); kW = kVA × PF. Size cables and protection to your wiring code.
Standards and method
Every current is calculated from the formulas above. No values are typed in.
Maintained by Miguel Coelho. Updated . See our editorial policy.
Printable kVA to amps chart
Full-load current for transformers and generators, single- and three-phase, 120 V to 600 V. Includes the exact definition, formulas, a worked example and sources. Conversion values are checked against the defining constants, and reference data is cited to its source, before the PDF is published.
Free to print, share and use in teaching materials with attribution (CC BY 4.0).
Also in the Electrician and Electronics Reference Pack, with related sheets in one PDF.
Full kVA to amps chart
Full-load current for transformers and generators, single- and three-phase, 120 V to 600 V. These are the same tables as the printable PDF. For: Electricians, electrical engineers, generator and transformer installers, facilities managers.
- Key relationship
- Apparent power S (kVA) = √3 × V(line) × I ÷ 1000 for three-phase; V × I ÷ 1000 for single-phase
- Formula
- I = kVA × 1000 ÷ (√3 × V); I = kW × 1000 ÷ (√3 × V × PF)
- Reverse
- kVA = √3 × V × I ÷ 1000; kW = kVA × PF
- Worked example
- 500 kVA at 480 V three-phase: 500,000 ÷ (1.732 × 480) = 601.4 A
- Rounding
- Amps to 1 decimal place. Voltages are line-to-line for three-phase. Generators are usually rated at power factor 0.8.
Three-phase kVA to amps
| kVA | 208 V | 220 V | 380 V | 400 V | 415 V | 440 V | 480 V | 600 V |
|---|---|---|---|---|---|---|---|---|
| 3 | 8.3 | 7.9 | 4.6 | 4.3 | 4.2 | 3.9 | 3.6 | 2.9 |
| 6 | 16.7 | 15.7 | 9.1 | 8.7 | 8.3 | 7.9 | 7.2 | 5.8 |
| 9 | 25.0 | 23.6 | 13.7 | 13.0 | 12.5 | 11.8 | 10.8 | 8.7 |
| 15 | 41.6 | 39.4 | 22.8 | 21.7 | 20.9 | 19.7 | 18.0 | 14.4 |
| 30 | 83.3 | 78.7 | 45.6 | 43.3 | 41.7 | 39.4 | 36.1 | 28.9 |
| 45 | 124.9 | 118.1 | 68.4 | 65.0 | 62.6 | 59.0 | 54.1 | 43.3 |
| 50 | 138.8 | 131.2 | 76.0 | 72.2 | 69.6 | 65.6 | 60.1 | 48.1 |
| 75 | 208.2 | 196.8 | 114.0 | 108.3 | 104.3 | 98.4 | 90.2 | 72.2 |
| 100 | 277.6 | 262.4 | 151.9 | 144.3 | 139.1 | 131.2 | 120.3 | 96.2 |
| 112.5 | 312.3 | 295.2 | 170.9 | 162.4 | 156.5 | 147.6 | 135.3 | 108.3 |
| 125 | 347.0 | 328.0 | 189.9 | 180.4 | 173.9 | 164.0 | 150.4 | 120.3 |
| 150 | 416.4 | 393.6 | 227.9 | 216.5 | 208.7 | 196.8 | 180.4 | 144.3 |
| 200 | 555.1 | 524.9 | 303.9 | 288.7 | 278.2 | 262.4 | 240.6 | 192.5 |
| 225 | 624.5 | 590.5 | 341.9 | 324.8 | 313.0 | 295.2 | 270.6 | 216.5 |
| 250 | 693.9 | 656.1 | 379.8 | 360.8 | 347.8 | 328.0 | 300.7 | 240.6 |
| 300 | 832.7 | 787.3 | 455.8 | 433.0 | 417.4 | 393.6 | 360.8 | 288.7 |
| 400 | 1,110.3 | 1,049.7 | 607.7 | 577.4 | 556.5 | 524.9 | 481.1 | 384.9 |
| 500 | 1,387.9 | 1,312.2 | 759.7 | 721.7 | 695.6 | 656.1 | 601.4 | 481.1 |
| 630 | 1,748.7 | 1,653.3 | 957.2 | 909.3 | 876.5 | 826.7 | 757.8 | 606.2 |
| 750 | 2,081.8 | 1,968.2 | 1,139.5 | 1,082.5 | 1,043.4 | 984.1 | 902.1 | 721.7 |
| 800 | 2,220.6 | 2,099.5 | 1,215.5 | 1,154.7 | 1,113.0 | 1,049.7 | 962.3 | 769.8 |
| 1,000 | 2,775.7 | 2,624.3 | 1,519.3 | 1,443.4 | 1,391.2 | 1,312.2 | 1,202.8 | 962.3 |
| 1,250 | 3,469.7 | 3,280.4 | 1,899.2 | 1,804.2 | 1,739.0 | 1,640.2 | 1,503.5 | 1,202.8 |
| 1,500 | 4,163.6 | 3,936.5 | 2,279.0 | 2,165.1 | 2,086.8 | 1,968.2 | 1,804.2 | 1,443.4 |
| 2,000 | 5,551.4 | 5,248.6 | 3,038.7 | 2,886.8 | 2,782.4 | 2,624.3 | 2,405.6 | 1,924.5 |
| 2,500 | 6,939.3 | 6,560.8 | 3,798.4 | 3,608.4 | 3,478.0 | 3,280.4 | 3,007.0 | 2,405.6 |
| 3,000 | 8,327.2 | 7,873.0 | 4,558.0 | 4,330.1 | 4,173.6 | 3,936.5 | 3,608.4 | 2,886.8 |
Single-phase kVA to amps
| kVA | 120 V | 208 V | 220 V | 230 V | 240 V | 277 V |
|---|---|---|---|---|---|---|
| 0.5 | 4.2 | 2.4 | 2.3 | 2.2 | 2.1 | 1.8 |
| 1 | 8.3 | 4.8 | 4.5 | 4.3 | 4.2 | 3.6 |
| 1.5 | 12.5 | 7.2 | 6.8 | 6.5 | 6.3 | 5.4 |
| 2 | 16.7 | 9.6 | 9.1 | 8.7 | 8.3 | 7.2 |
| 3 | 25.0 | 14.4 | 13.6 | 13.0 | 12.5 | 10.8 |
| 5 | 41.7 | 24.0 | 22.7 | 21.7 | 20.8 | 18.1 |
| 7.5 | 62.5 | 36.1 | 34.1 | 32.6 | 31.3 | 27.1 |
| 10 | 83.3 | 48.1 | 45.5 | 43.5 | 41.7 | 36.1 |
| 15 | 125.0 | 72.1 | 68.2 | 65.2 | 62.5 | 54.2 |
| 25 | 208.3 | 120.2 | 113.6 | 108.7 | 104.2 | 90.3 |
| 37.5 | 312.5 | 180.3 | 170.5 | 163.0 | 156.3 | 135.4 |
| 50 | 416.7 | 240.4 | 227.3 | 217.4 | 208.3 | 180.5 |
| 75 | 625.0 | 360.6 | 340.9 | 326.1 | 312.5 | 270.8 |
| 100 | 833.3 | 480.8 | 454.5 | 434.8 | 416.7 | 361.0 |
| 167 | 1,391.7 | 802.9 | 759.1 | 726.1 | 695.8 | 602.9 |
Three-phase kW to amps at power factor 0.8 (generators)
| kW | kVA | 208 V | 400 V | 415 V | 480 V | 600 V |
|---|---|---|---|---|---|---|
| 10 | 12.5 | 34.7 | 18.0 | 17.4 | 15.0 | 12.0 |
| 20 | 25 | 69.4 | 36.1 | 34.8 | 30.1 | 24.1 |
| 25 | 31.3 | 86.7 | 45.1 | 43.5 | 37.6 | 30.1 |
| 30 | 37.5 | 104.1 | 54.1 | 52.2 | 45.1 | 36.1 |
| 40 | 50 | 138.8 | 72.2 | 69.6 | 60.1 | 48.1 |
| 50 | 62.5 | 173.5 | 90.2 | 87.0 | 75.2 | 60.1 |
| 60 | 75 | 208.2 | 108.3 | 104.3 | 90.2 | 72.2 |
| 75 | 93.8 | 260.2 | 135.3 | 130.4 | 112.8 | 90.2 |
| 80 | 100 | 277.6 | 144.3 | 139.1 | 120.3 | 96.2 |
| 100 | 125 | 347.0 | 180.4 | 173.9 | 150.4 | 120.3 |
| 125 | 156.3 | 433.7 | 225.5 | 217.4 | 187.9 | 150.4 |
| 150 | 187.5 | 520.4 | 270.6 | 260.9 | 225.5 | 180.4 |
| 200 | 250 | 693.9 | 360.8 | 347.8 | 300.7 | 240.6 |
| 250 | 312.5 | 867.4 | 451.1 | 434.8 | 375.9 | 300.7 |
| 300 | 375 | 1,040.9 | 541.3 | 521.7 | 451.1 | 360.8 |
| 400 | 500 | 1,387.9 | 721.7 | 695.6 | 601.4 | 481.1 |
| 500 | 625 | 1,734.8 | 902.1 | 869.5 | 751.8 | 601.4 |
| 600 | 750 | 2,081.8 | 1,082.5 | 1,043.4 | 902.1 | 721.7 |
| 750 | 937.5 | 2,602.2 | 1,353.2 | 1,304.3 | 1,127.6 | 902.1 |
| 800 | 1,000 | 2,775.7 | 1,443.4 | 1,391.2 | 1,202.8 | 962.3 |
| 1,000 | 1,250 | 3,469.7 | 1,804.2 | 1,739.0 | 1,503.5 | 1,202.8 |
| 1,500 | 1,875 | 5,204.5 | 2,706.3 | 2,608.5 | 2,255.3 | 1,804.2 |
| 2,000 | 2,500 | 6,939.3 | 3,608.4 | 3,478.0 | 3,007.0 | 2,405.6 |
Three-phase amps to kVA
| Amps | kVA at 208 V | kVA at 400 V | kVA at 415 V | kVA at 480 V | kVA at 600 V |
|---|---|---|---|---|---|
| 10 | 3.6 | 6.9 | 7.2 | 8.3 | 10.4 |
| 16 | 5.8 | 11.1 | 11.5 | 13.3 | 16.6 |
| 20 | 7.2 | 13.9 | 14.4 | 16.6 | 20.8 |
| 25 | 9.0 | 17.3 | 18.0 | 20.8 | 26.0 |
| 32 | 11.5 | 22.2 | 23.0 | 26.6 | 33.3 |
| 40 | 14.4 | 27.7 | 28.8 | 33.3 | 41.6 |
| 50 | 18.0 | 34.6 | 35.9 | 41.6 | 52.0 |
| 63 | 22.7 | 43.6 | 45.3 | 52.4 | 65.5 |
| 80 | 28.8 | 55.4 | 57.5 | 66.5 | 83.1 |
| 100 | 36.0 | 69.3 | 71.9 | 83.1 | 103.9 |
| 125 | 45.0 | 86.6 | 89.9 | 103.9 | 129.9 |
| 160 | 57.6 | 110.9 | 115.0 | 133.0 | 166.3 |
| 200 | 72.1 | 138.6 | 143.8 | 166.3 | 207.8 |
| 250 | 90.1 | 173.2 | 179.7 | 207.8 | 259.8 |
| 400 | 144.1 | 277.1 | 287.5 | 332.6 | 415.7 |
| 630 | 227.0 | 436.5 | 452.8 | 523.8 | 654.7 |
| 800 | 288.2 | 554.3 | 575.0 | 665.1 | 831.4 |
| 1,000 | 360.3 | 692.8 | 718.8 | 831.4 | 1,039.2 |
| 1,250 | 450.3 | 866.0 | 898.5 | 1,039.2 | 1,299.0 |
| 1,600 | 576.4 | 1,108.5 | 1,150.1 | 1,330.2 | 1,662.8 |
| 2,000 | 720.5 | 1,385.6 | 1,437.6 | 1,662.8 | 2,078.5 |
| 2,500 | 900.7 | 1,732.1 | 1,797.0 | 2,078.5 | 2,598.1 |
| 3,200 | 1,152.9 | 2,217.0 | 2,300.2 | 2,660.4 | 3,325.5 |
| 4,000 | 1,441.1 | 2,771.3 | 2,875.2 | 3,325.5 | 4,156.9 |
kW, kVA and kvar at different power factors
For 100 kW of load. Lower power factor means more current for the same real power.
| Power factor | kVA for 100 kW | kvar for 100 kW | Amps at 400 V 3-phase | Amps at 480 V 3-phase |
|---|---|---|---|---|
| 0.60 | 166.7 | 133.3 | 240.6 | 200.5 |
| 0.70 | 142.9 | 102.0 | 206.2 | 171.8 |
| 0.75 | 133.3 | 88.2 | 192.5 | 160.4 |
| 0.80 | 125.0 | 75.0 | 180.4 | 150.4 |
| 0.85 | 117.6 | 62.0 | 169.8 | 141.5 |
| 0.90 | 111.1 | 48.4 | 160.4 | 133.6 |
| 0.95 | 105.3 | 32.9 | 151.9 | 126.6 |
| 1.00 | 100.0 | 0.0 | 144.3 | 120.3 |
Formulas
Motor full-load currents for conductor and protection sizing come from code tables (NEC 430.248–430.250) or the motor nameplate, not from these formulas.
| To find | Single-phase | Three-phase | DC |
|---|---|---|---|
| Amps from kVA | I = kVA × 1000 ÷ V | I = kVA × 1000 ÷ (√3 × V) | — |
| Amps from kW | I = kW × 1000 ÷ (V × PF) | I = kW × 1000 ÷ (√3 × V × PF) | I = kW × 1000 ÷ V |
| kVA from amps | kVA = V × I ÷ 1000 | kVA = √3 × V × I ÷ 1000 | — |
| kW from amps | kW = V × I × PF ÷ 1000 | kW = √3 × V × I × PF ÷ 1000 | kW = V × I ÷ 1000 |
| kW from kVA | kW = kVA × PF | kW = kVA × PF | — |
| Motor input kW | kW = hp × 0.7457 ÷ efficiency | kW = hp × 0.7457 ÷ efficiency | kW = hp × 0.7457 ÷ efficiency |
Sources for this chart
Every current is calculated from the formulas above. No values are typed in.
- IEEE Std 1459 — Definitions of apparent (VA), active (W) and reactive (var) power
- IEC 60038 — Standard voltages (230/400 V; 120/208 V, 277/480 V and 347/600 V systems in North America)
Related Converters & Charts
kVA and kW to Amps Chart (Single and Three Phase) FAQs
Common questions about the kVA to amps chart.
How many amps is 500 kVA at 480 V three phase?
I = 500,000 ÷ (√3 × 480) = 601.4 A. At 400 V it is 721.7 A and at 208 V it is 1,387.9 A.
How do you convert kW to amps?
Divide by the voltage and the power factor: I = kW × 1000 ÷ (√3 × V × PF) for three-phase, or kW × 1000 ÷ (V × PF) for single-phase. A 100 kW generator at power factor 0.8 and 480 V delivers 150.4 A.
What is the difference between kVA and kW?
kVA is apparent power (volts × amps); kW is the real power that does work. kW = kVA × power factor, so a 100 kVA generator rated at power factor 0.8 supplies 80 kW.
Can I download this chart as a PDF, CSV, or JSON?
Yes. Use the Download A4 PDF or US Letter PDF buttons for a printable version, or download the same tables as CSV or JSON from the links on this page.