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Amps to Watts Calculator

volts
< 1
Use this calculator to convert amps to watts for both alternating current (AC) and direct current (DC) flows.

Disclaimer: Whilst every effort has been made in building this calculator, we are not to be held liable for any damages or monetary losses arising out of or in connection with the use of it. This tool is here purely as a service to you, please use it at your own risk. Full disclaimer. Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate calculations.

How to convert amps to watts

The formula for converting amps to watts (at a fixed voltage) is watts = amps × volts. To convert amps to watts you multiply your amps figure by the voltage.

watts = amps × volts

Example conversions

  • 15 amps × 120 volts = 1800 watts
  • 20 amps × 120 volts = 2400 watts

Amps to watts at 120V (AC) chart

Amps: Watts (at 120V):
1 amps 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) chart

Amps: Watts (at 12V):
1 amps 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.

How to convert amps to watts manually

The Watt’s Law formula is all that’s needed for these unit conversions. The wattage (power produced / P) is calculated by multiplying the amps (current / I) by the voltage (V):

Power (P) = Current (I) x Voltage (V)

So…

watts = amps × volts

Example: 5 amps are being sent at 120 volts. What’s the wattage?

Power = Current x Voltage
Power = 5A x 120V
Power = 600W

Calculator created by Alastair Hazell

Content reviewed by Derek Bulled, Director of CDS Electrical and an approved electrician with over 30 years of experience.


If you have any problems using this amps and watts converter, please contact me.