Amps to Watts Calculator
Calculate power (Watts) from current (Amps) and voltage for both AC and DC circuits.
Table of Contents
Amps to Watts Conversion
Convert Amps (A) to Watts (W) with our comprehensive calculator. Learn how to calculate power consumption for DC and AC circuits with practical examples.
Ampere (A)
A unit of electric current measuring the rate of electric charge flow. One ampere equals one coulomb per second.
Watt (W)
A unit of power measuring the rate of energy usage. One watt equals one joule per second.
DC Circuit Calculation
P(W) = I(A) ร V(V)
Where:
- P = Power in Watts
- I = Current in Amps
- V = Voltage in Volts
AC Single Phase Calculation
P(W) = PF ร I(A) ร V(V)
Where:
- PF = Power Factor
- I = Current in Amps
- V = RMS Voltage in Volts
AC Three Phase Calculation
Line to Line:
P(W) = โ3 ร PF ร I(A) ร VL-L(V)Line to Neutral:
P(W) = 3 ร PF ร I(A) ร VL-N(V)Typical Power Factor Values
| Device | Typical Power Factor |
|---|---|
| Resistive Load | 1.0 |
| Fluorescent Lamp | 0.95 |
| Incandescent Lamp | 1.0 |
| Induction Motor (Full Load) | 0.85 |
| Induction Motor (No Load) | 0.35 |
| Synchronous Motor | 0.90 |
Important: These are typical values. For accurate calculations, use the actual power factor of your device.
Quick Reference Table (120V)
| Current (A) | Voltage (V) | Power (W) |
|---|---|---|
| 0.1 | 120 | 12 |
| 0.2 | 120 | 24 |
| 0.3 | 120 | 36 |
| 0.4 | 120 | 48 |
| 0.5 | 120 | 60 |
| 0.6 | 120 | 72 |
| 0.7 | 120 | 84 |
| 0.8 | 120 | 96 |
| 0.9 | 120 | 108 |
| 1.0 | 120 | 120 |
| 2.0 | 120 | 240 |
| 3.0 | 120 | 360 |
| 4.0 | 120 | 480 |
| 5.0 | 120 | 600 |
| 6.0 | 120 | 720 |
| 7.0 | 120 | 840 |
| 8.0 | 120 | 960 |
| 9.0 | 120 | 1080 |
| 10.0 | 120 | 1200 |
