Convert BTU to watt-hours

1 BTU=0.2931Wh

Use the converter below to change any BTU value into watt-hours instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.29307

Conversion formula

Forward

watt-hours = BTU × 0.2931

Reverse

BTU = watt-hours × 3.41214

Example: 10 BTU × 0.2931 = 2.93071 Wh.

About both units

From

British Thermal Unit

BTU

The British Thermal Unit equals approximately 1055 joules — the energy to raise 1 pound of water by 1 °F. Used for HVAC, heating, and air-conditioning capacity in the US. A 9000 BTU/h AC is a small room unit.

Real-world: Window AC: 5000–12,000 BTU/h. Central AC: 24,000–60,000 BTU/h. Home furnace: 60,000–100,000 BTU/h.

Read full british thermal unit reference →

Watt-Hour

The watt-hour equals 3600 joules — 1 W delivered for 1 hour. Used for phone, laptop and small-battery capacities. A typical smartphone battery is 10–20 Wh; a laptop is 50–100 Wh.

Real-world: iPhone battery: 12 Wh. MacBook Pro: 70 Wh. Power bank: 20 Wh–100 Wh. Airplane carry-on limit: usually 100 Wh.

Read full watt-hour reference →

British Thermal Unit to Watt-Hour conversion table

Common BTU to watt-hours values for quick reference.

British Thermal Unit (BTU)	Watt-Hour (Wh)
1 BTU	0.2931 Wh
10 BTU	2.93071 Wh
100 BTU	29.3071 Wh
500 BTU	146.536 Wh
1,000 BTU	293.071 Wh
5,000 BTU	1,465.36 Wh
10,000 BTU	2,930.71 Wh
50,000 BTU	14,653.55 Wh
100,000 BTU	29,307.11 Wh
500,000 BTU	146,535.53 Wh

Tips & common mistakes

Quick tips

1 BTU = 1055.06 J = 0.293 Wh.
BTU/h (power) and BTU (energy) are different — don't confuse.
Tons of refrigeration: 12,000 BTU/h = 1 ton AC.

Avoid these

Confusing BTU and BTU/h — energy vs power.
Using kcal when BTU is requested in HVAC specs.
Treating all BTUs as exact — definitions vary (IT, thermochemical, etc.).

Frequently asked questions

How many watt-hours in a british thermal unit?

One british thermal unit equals 0.2931 watt-hours.

How do I convert BTU to watt-hours?

Multiply the british thermal unit value by 0.2931 to get the equivalent in watt-hours.

What is 100 BTU in watt-hours?

100 BTU equals 29.3071 watt-hours.

Is a british thermal unit bigger than a watt-hour?

No. 1 british thermal unit equals 0.2931 watt-hours, so one british thermal unit is smaller.

How to convert BTU to watt-hours without a calculator?

Multiply by 0.29 for a quick estimate; use a calculator for precise results.

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