To use the amps to watts conversion calculator, select the current type, enter the current in amps and voltage in volts, and provide the power factor (a value between 0 and 1) for AC systems. For AC three phase systems, choose between line to line or line to neutral voltage. Click the “Calculate” button to display the power results in watts, kilowatts, and milliwatts in the output section. Click “Reset” to clear all fields and start fresh.
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DC Amps to Watts Calculation
P(W) = I(A) x V(V), where
P(W) – power in watts (W);
I(A) – electric current in amperes (A);
V(V) – voltage in volts (V).
Conversion for Single-Phase AC Circuits
P(W) = PF x I(A) x V(V), where
P(W) – power in watts (W);
I(A) – electric current in amperes (A);
PF – power factor;
V(V) – RMS voltage in volts (V).
Conversion for Three-Phase AC Circuits
Calculation with Line-to-Line Voltage
P(W) = √3 × PF × I(A) × VL-L(V), where
P(W) – power in watts (W);
I(A) – phase current in amperes (A);
PF – power factor;
V(L-L) – line-to-line RMS voltage in volts (V).
Calculation with Line to Neutral Voltage
P(W) = 3 × PF × I(A)× VL-N(V), where
P(W) – power in watts (W);
I(A) – phase current in amperes (A);
PF – power factor;
V(L-N) – line to neutral RMS voltage in volts (V).
Typical Power Factor Values
Here are typical power factor values in the table:
| Device/Load | Power Factor |
|---|---|
| Incandescent lamps | 1.0 |
| Resistive loads | 1.0 |
| Synchronous motors | 0.8-0.95 |
| Induction motors (small) | 0.7-0.8 |
| Induction motors (large) | 0.85-0.95 |
| Transformers | 0.8-0.95 |
| Fluorescent lighting (magnetic ballast) | 0.7-0.9 |
| Fluorescent lighting (electronic ballast) | 0.9-0.99 |
| Computers and electronics | 0.6-0.8 |
Amps to Watts at 12V (DC)
Table showing amps converted to watts at 12 volts DC.
| Current (A) | Power (W) |
|---|---|
| 0.1 | 1.2 |
| 0.2 | 2.4 |
| 0.3 | 3.6 |
| 0.4 | 4.8 |
| 0.5 | 6.0 |
| 0.6 | 7.2 |
| 0.7 | 8.4 |
| 0.8 | 9.6 |
| 0.9 | 10.8 |
| 1.0 | 12.0 |
| 1.5 | 18.0 |
| 2.0 | 24.0 |
| 2.5 | 30.0 |
| 3.0 | 36.0 |
| 3.5 | 42.0 |
| 4.0 | 48.0 |
| 4.5 | 54.0 |
| 5.0 | 60.0 |
| 10.0 | 120.0 |
| 15.0 | 180.0 |
| 20.0 | 240.0 |
Amps to Watts at 120V (Single-Phase AC)
Table showing amps converted to watts at 120 volts single-phase AC. Power factor equals 1.
| Current (A) | Power (W) |
|---|---|
| 0.1 | 12 |
| 0.2 | 24 |
| 0.3 | 36 |
| 0.4 | 48 |
| 0.5 | 60 |
| 0.6 | 72 |
| 0.7 | 84 |
| 0.8 | 96 |
| 0.9 | 108 |
| 1.0 | 120 |
| 1.5 | 180 |
| 2.0 | 240 |
| 2.5 | 300 |
| 3.0 | 360 |
| 3.5 | 420 |
| 4.0 | 480 |
| 4.5 | 540 |
| 5.0 | 600 |
| 10.0 | 1200 |
| 15.0 | 1800 |
| 20.0 | 2400 |
Amps to Watts at 240V (Single-Phase AC)
Here’s the table for the conversion of amps to watts at 240V single-phase AC:
| Current (A) | Power (W) |
|---|---|
| 0.1 | 24 |
| 0.2 | 48 |
| 0.3 | 72 |
| 0.4 | 96 |
| 0.5 | 120 |
| 0.6 | 144 |
| 0.7 | 168 |
| 0.8 | 192 |
| 0.9 | 216 |
| 1.0 | 240 |
| 1.5 | 360 |
| 2.0 | 480 |
| 2.5 | 600 |
| 3.0 | 720 |
| 3.5 | 840 |
| 4.0 | 960 |
| 4.5 | 1080 |
| 5.0 | 1200 |
| 10.0 | 2400 |
| 15.0 | 3600 |
| 20.0 | 4800 |
