btu to wh | Exact Decimal + Formula

1 BTU = 0.293071 Watt-hour

One watt-hour equals about 3.41 btu (exactly 3.412141633 BTU). Real-world use: HVAC heating and cooling ratings, gas appliances, and barbecue grills. This page expresses those values in watt-hours, which is used for battery capacities and small appliance energy consumption. Type a value above for an instant answer; the exact formula and the reference table are below.

About BTU and Watt-hour

BTU (BTU)

A British thermal unit (BTU) is the heat needed to raise one pound of water by one degree Fahrenheit, about 1,055 joules.

Where it's used: HVAC heating and cooling ratings, gas appliances, and barbecue grills.

Watt-hour (Wh)

A watt-hour is one watt of power sustained for one hour, equal to 3,600 joules.

Where it's used: Battery capacities and small appliance energy consumption.

Energy Converter

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Precision

Formula

Wh = BTU × 0.29307107

To convert BTU to Watt-hour, use the formula displayed above.

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BTU to Watt-hour: Quick Reference Table

BTU	Watt-hour (Decimal)	Fraction	Real-world equivalent
0.001 BTU	0.000293 Wh	-	fractional unit measurement
0.01 BTU	0.002931 Wh	-	fractional unit measurement
0.1 BTU	0.029307 Wh	-	fractional unit measurement
0.5 BTU	0.146536 Wh	-	fractional unit measurement
1 BTU	0.293071 Wh	-	fractional unit measurement
2 BTU	0.586142 Wh	-	fractional unit measurement
5 BTU	1.465355 Wh	-	standard single unit scale
10 BTU	2.930711 Wh	-	standard single unit scale
25 BTU	7.326777 Wh	-	standard single unit scale
50 BTU	14.653554 Wh	-	multiple unit increments
100 BTU	29.307107 Wh	-	multiple unit increments
250 BTU	73.267768 Wh	-	multiple unit increments
500 BTU	146.535535 Wh	-	multiple unit increments
1000 BTU	293.07107 Wh	-	multiple unit increments

BTU to Wh Formula and Examples

Direct Formula Wh = BTU × 0.29307107

Inverse Formula BTU = Wh × 3.412142

Mental Math Shortcut

Divide the value by roughly 3.4 to quickly estimate the converted result.

Common BTU to Watt-hour Calculations

5 BTU = 1.465355 Wh
10 BTU = 2.930711 Wh
50 BTU = 14.653554 Wh
100 BTU = 29.307107 Wh
500 BTU = 146.535535 Wh

Precision & Practical Use

For example, 10 BTU = 2.930711 Wh — roughly standard single unit scale.

Utility bills and appliance ratings are given in whole kWh or BTU. Round converted figures to match the source document you're comparing against.

How to Convert BTU to Watt-hour

How many watt-hours are in one btu?

One BTU (BTU) equals 0.293071 Watt-hour (Wh). To convert btus to watt-hours, multiply the btu value by 0.293071.

How do I convert BTU to Watt-hour?

Multiply your btu value by 0.293071 to get the result in Watt-hour: Wh = BTU × 0.293071. For example, 5 BTU = 1.465355 Wh.

What is the formula for converting BTU to Wh?

The conversion formula is Wh = BTU × 0.293071. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.

Is there a quick mental estimate for BTU to Wh?