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Energy
Watt-hours to BTU
Convert watt-hours (Wh) to BTU (BTU). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 Wh = 3.4121 BTU
Watt-hours to BTU Conversion Table
Common values, ready to copy:
| watt-hours | BTU |
|---|---|
| 1 Wh | 3.4121 BTU |
| 2 Wh | 6.8243 BTU |
| 5 Wh | 17.0606 BTU |
| 10 Wh | 34.1213 BTU |
| 25 Wh | 85.3032 BTU |
| 50 Wh | 170.61 BTU |
| 100 Wh | 341.21 BTU |
| 1,000 Wh | 3412.13 BTU |
Formula
BTU = watt-hours × 3.41212822e+0
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
About Watt-hours and BTU
Watt-hours (Wh): The energy consumed by a 1-watt device in 1 hour; equals 3,600 joules. Common uses: Small battery capacities (laptop batteries are typically 40-100 Wh), and lighting energy use.
BTU (BTU): British Thermal Unit; the energy to raise one pound of water by one degree Fahrenheit; defined as exactly 1,055.06 J. Common uses: US heating and air conditioning (a 24,000 BTU air conditioner cools roughly a 1,500 sq ft room), and US natural gas billing.
How the conversion works
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
The exact relationship is BTU = watt-hours × 3.41212822e+0, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between watt-hours and BTU comes up wherever energy measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.