British Thermal Unit to Watt-hour Converter

One British Thermal Unit equals 0.2930710702 Watt-hour (1 BTU = 0.2930710702 Wh). Multiply a British Thermal Unit value by 0.2930710702 to get the equivalent in Watt-hour. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.

Formula

Wh = BTU × 0.2930710702

Multiply the British Thermal Unit value by 0.2930710702 to get the equivalent value in Watt-hour.

Example Conversions

1 British Thermal Unit (BTU)

0.2930710702 Watt-hour (Wh)

5 British Thermal Unit (BTU)

1.465355351 Watt-hour (Wh)

10 British Thermal Unit (BTU)

2.930710702 Watt-hour (Wh)

25 British Thermal Unit (BTU)

7.326776754 Watt-hour (Wh)

100 British Thermal Unit (BTU)

29.30710702 Watt-hour (Wh)

Conversion Table

Common conversion values from British Thermal Unit to Watt-hour
British Thermal Unit (BTU) Watt-hour (Wh)
0.1 0.02930710702
0.5 0.1465355351
1 0.2930710702
2 0.5861421403
5 1.465355351
10 2.930710702
25 7.326776754
50 14.65355351
100 29.30710702
250 73.26776754
500 146.5355351
1000 293.0710702

How to Convert Manually

Use these steps to convert British Thermal Unit values to Watt-hour without the calculator.

  1. Write down the value in British Thermal Unit (BTU) that you want to convert.
  2. Multiply that value by 0.2930710702.
  3. For example, 10 British Thermal Unit × 0.2930710702 = 2.930710702 Watt-hour.
  4. Label the result as Watt-hour (Wh).

Relative Size Comparison

1 British Thermal Unit
1BTU
1 Watt-hour3.412141633British Thermal Units
1Wh

This chart shows the visual difference in size between exactly one British Thermal Unit and one Watt-hour.

About British Thermal Unit and Watt-hour

The British thermal unit is about 1,055.06 joules — the heat to raise one pound of water by 1 °F. US heating and cooling equipment is rated in BTU per hour. The watt-hour is exactly 3,600 joules — one watt sustained for one hour. Battery capacities for phones, laptops, and e-bikes are rated in watt-hours. One British Thermal Unit equals 0.2930710702 Watt-hour (1 BTU = 0.2930710702 Wh). British Thermal Unit to Watt-hour conversion comes up most often in air conditioner and furnace ratings in the US and in US natural gas appliance specs, typically when figures need restating for battery capacity ratings.

Precision and Rounding: Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15 British Thermal Unit equals 4.396066053 Watt-hour.

15 BTU × 0.2930710702 = 4.396066053 Wh

FAQ

How do I convert British Thermal Unit to Watt-hour?

Multiply the British Thermal Unit value by 0.2930710702 to get the equivalent value in Watt-hour.

What is the formula for British Thermal Unit to Watt-hour?

The formula is Wh = BTU × 0.2930710702.

How many Watt-hour are in 1 British Thermal Unit?

1 British Thermal Unit equals 0.2930710702 Watt-hour.

Can I convert Watt-hour back to British Thermal Unit?

Yes. 1 Watt-hour equals 3.412141633 British Thermal Unit, and the related converter can reverse the calculation.

What are common names for British Thermal Unit and Watt-hour?

British Thermal Unit is shown as BTU and may also be searched as btu, british thermal unit. Watt-hour is shown as Wh and may also be searched as watt hour, watt-hour.

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