Amps to Watts Calculator
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Amps to watts formula
The formula for converting amps to watts is:
Watts = Amps × Volts
How to convert amps to watts
The Watt’s Law formula is all that’s needed for this conversion. The wattage (power produced) is calculated by multiplying the amps (current) by the voltage...
To convert amps (electrical current) to watts (electrical power) at a fixed voltage, you can use the equation: watts = amps × volts. Simply multiply your amps figure by the voltage.
Example calculations
- 15 amps × 120 volts = 1800 watts
- 20 amps × 120 volts = 2400 watts
Amps to watts at 120V (AC)
| Amps: | Watts (at 120V): |
|---|---|
| 1 amp | 120 watts |
| 2 amps | 240 watts |
| 3 amps | 360 watts |
| 4 amps | 480 watts |
| 5 amps | 600 watts |
| 6 amps | 720 watts |
| 7 amps | 840 watts |
| 8 amps | 960 watts |
| 9 amps | 1080 watts |
| 10 amps | 1200 watts |
| 11 amps | 1320 watts |
| 12 amps | 1440 watts |
| 13 amps | 1560 watts |
| 14 amps | 1680 watts |
| 15 amps | 1800 watts |
| 16 amps | 1920 watts |
| 17 amps | 2040 watts |
| 18 amps | 2160 watts |
| 19 amps | 2280 watts |
| 20 amps | 2400 watts |
| 30 amps | 3600 watts |
| 40 amps | 4800 watts |
| 50 amps | 6000 watts |
| 60 amps | 7200 watts |
| 70 amps | 8400 watts |
| 80 amps | 9600 watts |
| 90 amps | 10800 watts |
| 100 amps | 12000 watts |
| Note: conversions are a guide only. | |
Amps to watts at 12V (DC)
| Amps: | Watts (at 12V): |
|---|---|
| 1 amp | 12 watts |
| 2 amps | 24 watts |
| 3 amps | 36 watts |
| 4 amps | 48 watts |
| 5 amps | 60 watts |
| 6 amps | 72 watts |
| 7 amps | 84 watts |
| 8 amps | 96 watts |
| 9 amps | 108 watts |
| 10 amps | 120 watts |
| 11 amps | 132 watts |
| 12 amps | 144 watts |
| 13 amps | 156 watts |
| 14 amps | 168 watts |
| 15 amps | 180 watts |
| 16 amps | 192 watts |
| 17 amps | 204 watts |
| 18 amps | 216 watts |
| 19 amps | 228 watts |
| 20 amps | 240 watts |
| 30 amps | 360 watts |
| 40 amps | 480 watts |
| 50 amps | 600 watts |
| 60 amps | 720 watts |
| 70 amps | 840 watts |
| 80 amps | 960 watts |
| 90 amps | 1080 watts |
| 100 amps | 1200 watts |
| Note: conversions are a guide only. | |
Amps to watts conversion example
Let's go through an example conversion for amps to watts...
Example question
Question: 5 amps are being sent at 120 volts. What’s the wattage?
- Power = Current × Voltage
- Power = 5A × 120V
- Power = 600W
As you can see, converting amps to watts is a fairly straightforward process. If you need a little help with checking your calculation, you can use our amps to watts calculator at the top of this page.
Calculator by Alastair Hazell Last updated: July 31, 2023This page has been reviewed by Derek Bulled, Director of CDS Electrical and an approved electrician with over 30 years of experience.
References
- What is Watt’s law?, EngineeringClicks.
- How Much Electrical Power Do You Need?, Mississippi State University.
- Unit 4: Energy Through Our Lives-Part II, University of Wisconsin - Stevens Point.
If you have any problems using our amps and watts converter, please contact us.