Conversions

Watts to BTU Calculator

Convert electrical power in watts into a heat rate in BTU per hour — handy for comparing heaters and AC units.

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W

Results

Heat rate
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Last updated June 30, 2026. Results update automatically as you type.

How it works

BTU per hour = watts × 3.412. So 1,000 W equals about 3,412 BTU/h.

Frequently asked questions

How many BTU is 1000 watts?

About 3,412 BTU per hour.

Is this for heaters or AC?

Both. For a heater, watts in roughly equals heat out. For an AC, the BTU cooling output is usually much higher than its electrical watts because it moves heat rather than generating it.

BTU and tons of cooling?

12,000 BTU/h equals one ton of cooling, which is about 3,517 W of heat.

These calculators provide general estimates for educational purposes only and are not financial advice. Real-world results depend on factors not captured here. Verify figures independently before making any purchase or financial decision.

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