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Single vs. Three Phase AC - Amperage

Convert between single phase (120, 240 and 480 Voltage) and three phase (240 and 480 Voltage)

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In a single-phase AC power system there is only one single sinusoidal voltage.

Most AC power is produced and distributed as three-phase power with three sinusoidal voltages 120 degrees out of phase with each other.

The diagram and table below can be used to convert amperage between single phase and three phase equipment and vice versa.

print Single Phase vs. Three Phase AC Diagram

Example - Power Supply to Electric Heater

10 kW of power is required by an electric heater. The power supply available is 230V single or three phase. From the chart above we can estimate the current in the two alternatives to be approximately

  • 43 A with single phase 230V
  • 25 A with three phase 230V

Apparent Power is the power supplied to the electric circuit - typical from a power supplier to the grid - to cover the real and reactive power consumption in the loads. For pure resistive loads apparent power is equal to real power and 1 VA = 1 W.

For full table with Three Phase Balanced Loads - rotate the screen!

Apparent Power
(VA)
Current (amps)
Single Phase (volts)Three Phase Balanced Load (volts)
120208230240208230240277347380400415480600
100 0.83 0.48 0.43 0.42 0.28 0.25 0.24 0.21 0.17 0.15 0.14 0.14 0.12 0.10
150 1.3 0.72 0.65 0.63 0.42 0.38 0.36 0.31 0.25 0.23 0.22 0.21 0.18 0.14
200 1.7 1.0 0.87 0.83 0.56 0.50 0.48 0.42 0.33 0.30 0.29 0.28 0.24 0.19
250 2.1 1.2 1.1 1.0 0.69 0.63 0.60 0.52 0.42 0.38 0.36 0.35 0.30 0.24
300 2.5 1.4 1.3 1.3 0.83 0.75 0.72 0.63 0.50 0.46 0.43 0.42 0.36 0.29
350 2.9 1.7 1.5 1.5 1.0 0.88 0.84 0.73 0.58 0.53 0.51 0.49 0.42 0.34
400 3.3 1.9 1.7 1.7 1.1 1.0 1.0 0.83 0.67 0.61 0.58 0.56 0.48 0.38
450 3.8 2.2 2.0 1.9 1.2 1.1 1.1 0.94 0.75 0.68 0.65 0.63 0.54 0.43
500 4.2 2.4 2.2 2.1 1.4 1.3 1.2 1.0 0.83 0.76 0.72 0.70 0.60 0.48
550 4.6 2.6 2.4 2.3 1.5 1.4 1.3 1.1 0.92 0.84 0.79 0.77 0.66 0.53
600 5.0 2.9 2.6 2.5 1.7 1.5 1.4 1.3 1.0 0.91 0.87 0.83 0.72 0.58
650 5.4 3.1 2.8 2.7 1.8 1.6 1.6 1.4 1.1 1.0 0.94 0.90 0.78 0.63
700 5.8 3.4 3.0 2.9 1.9 1.8 1.7 1.5 1.2 1.1 1.0 1.0 0.84 0.67
750 6.3 3.6 3.3 3.1 2.1 1.9 1.8 1.6 1.2 1.1 1.1 1.0 0.90 0.72
800 6.7 3.8 3.5 3.3 2.2 2.0 1.9 1.7 1.3 1.2 1.2 1.1 1.0 0.77
850 7.1 4.1 3.7 3.5 2.4 2.1 2.0 1.8 1.4 1.3 1.2 1.2 1.0 0.82
900 7.5 4.3 3.9 3.8 2.5 2.3 2.2 1.9 1.5 1.4 1.3 1.3 1.1 0.87
950 7.9 4.6 4.1 4.0 2.6 2.4 2.3 2.0 1.6 1.4 1.4 1.3 1.1 0.91
1000 8.3 4.8 4.3 4.2 2.8 2.5 2.4 2.1 1.7 1.5 1.4 1.4 1.2 1.0
1100 9.2 5.3 4.8 4.6 3.1 2.8 2.6 2.3 1.8 1.7 1.6 1.5 1.3 1.1
1200 10 5.8 5.2 5.0 3.3 3.0 2.9 2.5 2.0 1.8 1.7 1.7 1.4 1.2
1300 11 6.3 5.7 5.4 3.6 3.3 3.1 2.7 2.2 2.0 1.9 1.8 1.6 1.3
1400 12 6.7 6.1 5.8 3.9 3.5 3.4 2.9 2.3 2.1 2.0 1.9 1.7 1.3
1500 13 7.2 6.5 6.3 4.2 3.8 3.6 3.1 2.5 2.3 2.2 2.1 1.8 1.4
1600 13 7.7 7.0 6.7 4.4 4.0 3.8 3.3 2.7 2.4 2.3 2.2 1.9 1.5
1700 14 8.2 7.4 7.1 4.7 4.3 4.1 3.5 2.8 2.6 2.5 2.4 2.0 1.6
1800 15 8.7 7.8 7.5 5.0 4.5 4.3 3.8 3.0 2.7 2.6 2.5 2.2 1.7
1900 16 9.1 8.3 7.9 5.3 4.8 4.6 4.0 3.2 2.9 2.7 2.6 2.3 1.8
2000 17 9.6 8.7 8.3 5.6 5.0 4.8 4.2 3.3 3.0 2.9 2.8 2.4 1.9
2500 21 12 11 10 6.9 6.3 6.0 5.2 4.2 3.8 3.6 3.5 3.0 2.4
3000 25 14 13 13 8.3 7.5 7.2 6.3 5.0 4.6 4.3 4.2 3.6 2.9
3500 29 17 15 15 9.7 8.8 8.4 7.3 5.8 5.3 5.1 4.9 4.2 3.4
4000 33 19 17 17 11 10 9.6 8.3 6.7 6.1 5.8 5.6 4.8 3.8
4500 38 22 20 19 12 11 11 9.4 7.5 6.8 6.5 6.3 5.4 4.3
5000 42 24 22 21 14 13 12 10 8.3 7.6 7.2 7.0 6.0 4.8
5500 46 26 24 23 15 14 13 11 9.2 8.4 7.9 7.7 6.6 5.3
6000 50 29 26 25 17 15 14 13 10 9.1 8.7 8.3 7.2 5.8
6500 54 31 28 27 18 16 16 14 11 9.9 9.4 9.0 7.8 6.3
7000 58 34 30 29 19 18 17 15 12 11 10 9.7 8.4 6.7
7500 63 36 33 31 21 19 18 16 12 11 11 10 9.0 7.2
8000 67 38 35 33 22 20 19 17 13 12 12 11 9.6 7.7
8500 71 41 37 35 24 21 20 18 14 13 12 12 10 8.2
9000 75 43 39 38 25 23 22 19 15 14 13 13 11 8.7
9500 79 46 41 40 26 24 23 20 16 14 14 13 11 9.1
10000 83 48 43 42 28 25 24 21 17 15 14 14 12 9.6
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