BTU to Watt-hours Converter
Convert BTU (BTU) to Watt-hours (Wh) instantly, or use the conversion table below to look up common values.
BTU to Watt-hours conversion table
| BTU (BTU) | Watt-hours (Wh) |
|---|---|
| 1 | 0.293071 |
| 2 | 0.586142 |
| 3 | 0.879213 |
| 4 | 1.172284 |
| 5 | 1.465355 |
| 10 | 2.930711 |
| 25 | 7.326777 |
| 50 | 14.653554 |
| 100 | 29.307107 |
How to convert BTU to Watt-hours
1 BTU equals 0.293071 Wh. Use the converter above for any value, or read the table for common conversions.
Wh = BTU × 0.2930710701722222 · BTU = Wh × 3.4121416331279417Multiply a btu figure by 0.293071 to get watt-hours, or divide it by 3.412142 to go the other way.
Worked examples
- 1 BTU= 0.293071 Wh
- 5 BTU= 1.465355 Wh
- 10 BTU= 2.930711 Wh
- 100 BTU= 29.307107 Wh
- 500 BTU= 146.535535 Wh
What these units are
BTU (BTU). A BTU (British thermal unit) is 1,055.05585262 joules — the energy needed to heat one pound of water by one degree Fahrenheit. It is used for heating and cooling capacity.
Watt-hours (Wh). A watt-hour is the energy of one watt sustained for one hour — 3,600 joules. It is used for battery and power-bank capacity; a phone battery is typically 10 to 20 watt-hours.
All factors are exact definitions, so only the display is rounded.
Checking a btu to watt-hours conversion
Energy units are defined against the joule, so every conversion in this dimension is a single exact multiplication by a published number rather than a chain of steps that could accumulate error.
The pair that needs care is the kilowatt-hour, because it looks like a power unit and is not. It is a watt sustained for an hour, which is why an electricity meter counts in kilowatt-hours while a generator is rated in kilowatts: one is an amount, the other is a rate, and only a duration links them.
To check an energy conversion, express both sides in joules or both in kilowatt-hours before comparing. The commonest mistake is treating a food calorie as a calorie when the label means a kilocalorie, which understates the figure a thousandfold.
Tanzania reference points
Real quantities, converted into the units on this page.
One unit of electricity on a Tanzanian prepaid meter
1 kWh = 3,412.141633 BTU = 1,000 Wh
The average domestic rate was about 229.59 TZS per kWh as of December 2025, including taxes and supply. That is an average across domestic customers, not the marginal rate on a bill.
Source: GlobalPetrolPrices — Tanzania electricity prices (compiled from EWURA/TANESCO tariffs) · verified 2026-09-14
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