Watt-Hour to BTU (th) Converter

Energy Converter

27 units available

Decimals:

From

To

3.414426

1 Wh = 3.414426 BTU

Formula:

BTU = Wh × 3.4144259496

With your value: 1 Wh = 3.41442595 BTU

How big is that?

Everyday references on a logarithmic scale, all expressed in watt-hour so you can sanity-check the result.

Heartbeat (1/3.6e+3 your value)0.000278 Wh

Your value1.00 Wh

AA battery charge (2.8× your value)2.78 Wh

Slice of bread (78× your value)77.8 Wh

Daily food intake (2.3e+3× your value)2.33e+3 Wh

Litre of petrol (9.5e+3× your value)9.50e+3 Wh

Other Watt-Hour to BTU (th) conversions

2 Wh to BTU 3 Wh to BTU 4 Wh to BTU 5 Wh to BTU 6 Wh to BTU 7 Wh to BTU 8 Wh to BTU

Watt-Hour to BTU (th) Conversion Table

Watt-Hour (Wh)	BTU (th) (BTU)
0.5	1.707213
1	3.414426
2	6.828852
5	17.07213
10	34.144259
15	51.216389
20	68.288519
25	85.360649
50	170.721297
100	341.442595
250	853.606487
500	1,707.212975
1000	3,414.42595

BTU (th) to Watt-Hour Conversion Table

BTU (th) (BTU)	Watt-Hour (Wh)
0.5	0.146438
1	0.292875
2	0.58575
5	1.464375
10	2.92875
15	4.393125
20	5.8575
25	7.321875
50	14.64375
100	29.2875
250	73.21875
500	146.4375
1000	292.875

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Watt-Hour (Wh)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

BTU (th) (BTU)

Energy

Exact conversion

The International Table BTU is exactly 1055.055 852 62 J.

Thermochemical and 39 °F BTU definitions differ by up to 0.2 %.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Watt-Hour to BTU (th)

To convert from Watt-Hour (Wh) to BTU (th) (BTU), multiply the value by 3.4144259496.

Formula: BTU = Wh × 3.4144259496

Reverse: Wh = BTU × 0.292875

Step-by-Step Example

Start with your value in Watt-Hour. For example: 5 Wh
Multiply by the conversion factor: 5 x 3.4144259496
The result is: 17.07213 BTU

About Watt-Hour

The watt-hour (Wh) is a unit of energy and work. One watt-hour equals 3600 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

About BTU (th)

The btu (th) (BTU) is a unit of energy and work. One btu (th) equals 1054.35 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many BTU (th) are in 1 Watt-Hour?

There are exactly 3.4144259496 BTU (th) in 1 Watt-Hour. This means the conversion factor from Watt-Hour to BTU (th) is 3.4144259496.

What is the formula to convert Watt-Hour to BTU (th)?

The formula to convert Watt-Hour to BTU (th) is: BTU = Wh × 3.4144259496. For example, to convert 10 Watt-Hour to BTU (th), you would multiply 10 by 3.4144259496.

What is a Watt-Hour?