Energy

BTU to Wh Converter

Convert British thermal units (BTU) to watt-hours (Wh). 1 British thermal unit = 0.2930710702 watt-hours (exact)

1 British thermal unit = 0.293071070172 watt-hours

How to convert British thermal units to watt-hours

FormulaWh = BTU × 0.2930710702

Multiply the value in British thermal units by 0.2930710702. To go the other way, multiply by 3.412141633 (or divide by 0.2930710702).

A British thermal unit is smaller than a watt-hour: it takes 3.412141633 British thermal units to make one watt-hour.

Worked examples

  • 1 British thermal unit1 BTU × 0.2930710702 = 0.2930710702 Wh
  • 5 British thermal units5 BTU × 0.2930710702 = 1.465355351 Wh
  • 10 British thermal units10 BTU × 0.2930710702 = 2.930710702 Wh
  • 20 British thermal units20 BTU × 0.2930710702 = 5.861421403 Wh
  • 100 British thermal units100 BTU × 0.2930710702 = 29.30710702 Wh

British thermal units to watt-hours conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

British thermal units to watt-hours: 0.1–10 BTU
British thermal units (BTU)Watt-hours (Wh)
0.1 BTU0.029307107 Wh
0.25 BTU0.073267768 Wh
0.5 BTU0.14653554 Wh
1 BTU0.29307107 Wh
2 BTU0.58614214 Wh
3 BTU0.87921321 Wh
4 BTU1.1722843 Wh
5 BTU1.4653554 Wh
6 BTU1.7584264 Wh
7 BTU2.0514975 Wh
8 BTU2.3445686 Wh
9 BTU2.6376396 Wh
10 BTU2.9307107 Wh
British thermal units to watt-hours: 12–1,000 BTU
British thermal units (BTU)Watt-hours (Wh)
12 BTU3.5168528 Wh
15 BTU4.3960661 Wh
20 BTU5.8614214 Wh
25 BTU7.3267768 Wh
30 BTU8.7921321 Wh
40 BTU11.722843 Wh
50 BTU14.653554 Wh
75 BTU21.98033 Wh
100 BTU29.307107 Wh
250 BTU73.267768 Wh
500 BTU146.53554 Wh
1,000 BTU293.07107 Wh

About the units

British thermal unit (BTU)

The International Table BTU, 1,055.05585262 J — roughly the energy to heat one pound of water by 1 °F. Furnace and AC capacities are rated in BTU (per hour). One British thermal unit equals 1,055.055853 joules (J).

Watt-hour (Wh)

One watt sustained for an hour: 3,600 J. Battery capacities are rated in Wh.

Frequently asked questions

How many watt-hours are in one British thermal unit?

There are 0.2930710702 watt-hours in one British thermal unit, and this value is exact by definition.

How do I convert British thermal units to watt-hours?

Multiply the number of British thermal units by 0.2930710702. For example, 10 BTU × 0.2930710702 = 2.930710702 Wh.

How many British thermal units are in one watt-hour?

One watt-hour equals 3.412141633 British thermal units. That is the reverse factor, 1 ÷ 0.2930710702.

What is 10 British thermal units in watt-hours?

10 BTU = 2.930710702 Wh.

Is this BTU to Wh converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

Convert British thermal units to other units

Convert other units to watt-hours

Try “psi to bar”, “cups”, “binary” or “5 ft in cm”.