Calc

Watts to Amps Conversion Calculator

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Use this calculator tool to convert watts to amps and amps to watts. Options are available for both alternating current (AC) and direct current (DC). An explanation for how to convert between watts and amps and conversion charts are available further down the page.

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< 1

volts
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Disclaimer

Whilst every effort has been made in building this watts and amps converter, we are not to be held liable for any special, incidental, indirect or consequential damages or monetary losses of any kind arising out of or in connection with the use of the converter tools and information derived from the web site. This watts and amps converter is here purely as a service to you, please use it at your own risk. Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate conversions.

Please see the full disclaimer for more information.

Convert between watts and amps

If trying to convert amps, watts and volts has got you feeling wired, then settle down and plug in to our handy guide to discover what’s watt. You’re sure to have a lightbulb moment in no time!

  1. How do you convert watts to amps?
    Formula for converting watts to amps (at a fixed voltage) is:
    amps = watts ÷ volts
  2. How do you convert amps to watts?
    Formula for converting amps to watts (at a fixed voltage) is:
    watts = amps x volts

Let's look at these conversions a little more closely.

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Amps

Amps are amperes, a unit which measures electrical current. It can be helpful to imagine electrical current as water in a hose. In this analogy, the quantity (volume) of water would be the amps.

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Volts

Volts are a unit to measure force. They measure the force required to make the electrical current (amps) flow. In the hose analogy, the volts would be the water pressure. North American homes typically use 120V for their electrical supply, whilst 230V is common across many other countries.

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Watts

Watts represent the amount of energy produced by the amps and volts working together. Multiplying amps (water volume) by volts (water pressure) gives you the wattage (the resulting power or energy). A water wheel would turn faster and longer, generating more energy if it uses increased water volume and higher water pressure; the same applies to the wattage if amps and volts are increased.

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AC/DC

DC stands for direct current, when the current flows in one single direction. A flashlight with a battery uses a direct current.

AC stands for alternating current, when the current periodically changes direction. In Northern America and Western Japan, this usually happens 60 times per second, or 60Hz / hertz. In Europe, the UK, East Japan and most of Australia, South America, Africa and Asia, the current changes direction 50 times per second, which is 50Hz. Power supplied to homes and businesses uses AC supply.

How to convert amps to watts

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 (force / E):

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

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

How to convert watts to amps

To find the amps, you work backwards with Watt’s Law and divide the wattage by the volts:

Current (I) = Power (P) ÷ Voltage (E)

So…

amps = watts ÷ volts

Example: 600 watts are being sent at 120 volts. What's the current?

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

And…

If you’re working with larger units, you need to remember that 1 kilowatt is equal to 1000 watts. The formula for Watt’s law stays the same, just as long as you express the wattage in watts (your sum will go wrong if you use ‘5W’ to mean ‘5KW’; you need to use 5000W instead).

Example: 2.4KW watts are being sent at 120 volts

Current = Power ÷ Voltage
Current = 2400W ÷ 120V
Current = 20A

It’s simple, really, but if you’re feeling short-circuited after all those numbers, just use our watts and amps conversion calculator above.

Watts and amps conversion charts

Watts and amps conversions at 120V (AC) chart
Power Voltage Current
50 watts 120 volts 0.4167 amps
100 watts 120 volts 0.8333 amps
150 watts 120 volts 1.25 amps
200 watts 120 volts 1.6667 amps
250 watts 120 volts 2.0833 amps
300 watts 120 volts 2.5 amps
350 watts 120 volts 2.9167 amps
400 watts 120 volts 3.3333 amps
450 watts 120 volts 3.75 amps
500 watts 120 volts 4.1667 amps
550 watts 120 volts 4.5833 amps
600 watts 120 volts 5 amps
650 watts 120 volts 5.4167 amps
700 watts 120 volts 5.8333 amps
750 watts 120 volts 6.25 amps
800 watts 120 volts 6.6667 amps
850 watts 120 volts 7.0833 amps
900 watts 120 volts 7.5 amps
950 watts 120 volts 7.9167 amps
1000 watts 120 volts 8.3333 amps
1050 watts 120 volts 8.75 amps
1100 watts 120 volts 9.1667 amps
1150 watts 120 volts 9.5833 amps
1200 watts 120 volts 10 amps
1250 watts 120 volts 10.4167 amps
1300 watts 120 volts 10.8333 amps
1350 watts 120 volts 11.25 amps
1400 watts 120 volts 11.6667 amps
1450 watts 120 volts 12.0833 amps
1500 watts 120 volts 12.5 amps
1550 watts 120 volts 12.9167 amps
1600 watts 120 volts 13.3333 amps
1650 watts 120 volts 13.75 amps
1700 watts 120 volts 14.1667 amps
1750 watts 120 volts 14.5833 amps
1800 watts 120 volts 15 amps
1850 watts 120 volts 15.4167 amps
1900 watts 120 volts 15.8333 amps
1950 watts 120 volts 16.25 amps
2000 watts 120 volts 16.6667 amps

Note: conversions are for guide-purposes only and are rounded to maximum 4 decimal places.

Watts and amps conversions at 12V (DC) chart
Power Voltage Current
5 watts 12 volts 0.4167 amps
10 watts 12 volts 0.8333 amps
15 watts 12 volts 1.25 amps
20 watts 12 volts 1.6667 amps
25 watts 12 volts 2.0833 amps
30 watts 12 volts 2.5 amps
35 watts 12 volts 2.9167 amps
40 watts 12 volts 3.3333 amps
45 watts 12 volts 3.75 amps
50 watts 12 volts 4.1667 amps
55 watts 12 volts 4.5833 amps
60 watts 12 volts 5 amps
65 watts 12 volts 5.4167 amps
70 watts 12 volts 5.8333 amps
75 watts 12 volts 6.25 amps
80 watts 12 volts 6.6667 amps
85 watts 12 volts 7.0833 amps
90 watts 12 volts 7.5 amps
95 watts 12 volts 7.9167 amps
100 watts 12 volts 8.3333 amps
105 watts 12 volts 8.75 amps
110 watts 12 volts 9.1667 amps
115 watts 12 volts 9.5833 amps
120 watts 12 volts 10 amps
125 watts 12 volts 10.4167 amps
130 watts 12 volts 10.8333 amps
135 watts 12 volts 11.25 amps
140 watts 12 volts 11.6667 amps
145 watts 12 volts 12.0833 amps
150 watts 12 volts 12.5 amps
155 watts 12 volts 12.9167 amps
160 watts 12 volts 13.3333 amps
165 watts 12 volts 13.75 amps
170 watts 12 volts 14.1667 amps
175 watts 12 volts 14.5833 amps
180 watts 12 volts 15 amps
185 watts 12 volts 15.4167 amps
190 watts 12 volts 15.8333 amps
195 watts 12 volts 16.25 amps
200 watts 12 volts 16.6667 amps

Note: conversions are for guide-purposes only and are rounded to maximum 4 decimal places.

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