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British Thermal Units to Watt-hours Converter

Convert British thermal units (IT) (Btu) to watt-hours (Wh), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
0.293071070172 Wh
joules (watt-seconds)
1,055.05585262 J
kilojoules
1.05505585262 kJ
megajoules
0.00105505585262 MJ
gigajoules
1.05505585262 × 10⁻⁶ GJ
calories (thermochemical)
252.164400722 cal
kilocalories (food Calories)
0.252164400722 kcal
megacalories
0.000252164400722 Mcal
kilowatt-hours
0.000293071070172 kWh
megawatt-hours
2.93071070172 × 10⁻⁷ MWh
million Btu
1 × 10⁻⁶ MMBtu
therms (100,000 Btu)
1 × 10⁻⁵ thm
quads (10¹⁵ Btu)
1 × 10⁻¹⁵ quad
electronvolts
6.58514067819 × 10²¹ eV
kiloelectronvolts
6.58514067819 × 10¹⁸ keV
megaelectronvolts
6.58514067819 × 10¹⁵ MeV

1 Btu = 0.293071070172 Wh

Show the working
  1. 1 Btu = 0.293071070172 Wh
  2. 1 × 0.293071070172 = 0.293071070172 Wh

How to convert british thermal units to watt-hours

1 Btu = 0.293071070172 Wh, so multiply by 0.293071070172 to go from British thermal units (IT) to watt-hours. Going the other way, 1 Wh = 3.41214163313 Btu.

Wh = Btu × 0.293071070172
Btu = Wh × 3.41214163313

Worked example:

1 Btu = 0.293071070172 Wh
5 × 0.293071070172 = 1.46535535086 Wh

British Thermal Units to watt-hours table

British Thermal UnitsWatt-hours
1 Btu0.293071070172 Wh
2 Btu0.586142140344 Wh
3 Btu0.879213210517 Wh
4 Btu1.17228428069 Wh
5 Btu1.46535535086 Wh
6 Btu1.75842642103 Wh
7 Btu2.05149749121 Wh
8 Btu2.34456856138 Wh
9 Btu2.63763963155 Wh
10 Btu2.93071070172 Wh
15 Btu4.39606605258 Wh
20 Btu5.86142140344 Wh
25 Btu7.32677675431 Wh
30 Btu8.79213210517 Wh
40 Btu11.7228428069 Wh
50 Btu14.6535535086 Wh
75 Btu21.9803302629 Wh
100 Btu29.3071070172 Wh
250 Btu73.2677675431 Wh
500 Btu146.535535086 Wh
1000 Btu293.071070172 Wh

About the units

British Thermal Units (Btu)
British thermal units (IT), a US customary unit. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.

Formula version 0.1.0Reviewed