Power converter
Watts to Ohms Calculator
Find resistance in ohms from power in watts and voltage or current.
How Watts to Ohms works
Ohms measure electrical resistance. According to Ohm's and Watt's laws, resistance can be calculated if you know power and either voltage or current.
This is useful for sizing heating elements or resistors.
Formula
1
R = V² ÷ P2
R = P ÷ I²Where V is volts, I is amps, P is watts.
Watts to Ohms conversion table
| Power↕ | Resistance at 120V↕ |
|---|---|
| 60 W | 240 Ω |
| 100 W | 144 Ω |
| 1000 W | 14.4 Ω |
| 1500 W | 9.6 Ω |
FAQ: Watts to Ohms
How do you convert watts to ohms?
If you know voltage: Ohms = Volts² ÷ Watts. If you know current: Ohms = Watts ÷ Amps².
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