Watts to Amps Calculator
Safely convert electric power (Watts) to current (Amps) for Direct Current (DC) or Alternating Current (AC) circuits using our precise engineering calculator.
Electrical Parameters
W
V
The Watt's Law & Power Triangle
The relationship between Power (P), Voltage (V), and Current (I) is described by Watt's Law.
DC Formula
I = P / V
Current (Amps) equals Power (Watts) divided by Voltage (Volts).
AC Formula (Single Phase)
I = P / (PF × V)
You must divide by the Power Factor (PF) because some current is used to create magnetic fields (reactive power) and doesn't do "work" (watts).
Common Breaker Sizes
| Circuit Type | Voltage | Max Watts (80% Load) | Common Usage |
|---|---|---|---|
| 15 Amp | 120V | 1,440W | Lighting, Outlets |
| 20 Amp | 120V | 1,920W | Kitchen Outlets, Tools |
| 30 Amp | 240V | 5,760W | Dryers, Water Heaters |
*Safety Code typically recommends loading circuits to only 80% of their rated capacity for continuous loads.
Frequently Asked Questions
Frequently Asked Questions
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