British Thermal Unit to Joule Converter

One British Thermal Unit equals 1055.055853 Joule (1 BTU = 1055.055853 J). Multiply a British Thermal Unit value by 1055.055853 to get the equivalent in Joule. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.

Formula

J = BTU × 1055.055853

Multiply the British Thermal Unit value by 1055.055853 to get the equivalent value in Joule.

Example Conversions

1 British Thermal Unit (BTU)

1055.055853 Joule (J)

5 British Thermal Unit (BTU)

5275.279263 Joule (J)

10 British Thermal Unit (BTU)

10550.55853 Joule (J)

25 British Thermal Unit (BTU)

26376.39632 Joule (J)

100 British Thermal Unit (BTU)

105505.5853 Joule (J)

Conversion Table

Common conversion values from British Thermal Unit to Joule
British Thermal Unit (BTU) Joule (J)
0.1 105.5055853
0.5 527.5279263
1 1055.055853
2 2110.111705
5 5275.279263
10 10550.55853
25 26376.39632
50 52752.79263
100 105505.5853
250 263763.9632
500 527527.9263
1000 1055055.853

How to Convert Manually

Use these steps to convert British Thermal Unit values to Joule without the calculator.

  1. Write down the value in British Thermal Unit (BTU) that you want to convert.
  2. Multiply that value by 1055.055853.
  3. For example, 10 British Thermal Unit × 1055.055853 = 10550.55853 Joule.
  4. Label the result as Joule (J).

Relative Size Comparison

1 British Thermal Unit
1BTU
1 Joule0.0009478171203British Thermal Units

This chart shows the visual difference in size between exactly one British Thermal Unit and one Joule.

About British Thermal Unit and Joule

The British thermal unit is about 1,055.06 joules — the heat to raise one pound of water by 1 °F. US heating and cooling equipment is rated in BTU per hour. The joule is the SI derived unit of energy — the work done by a force of one newton over one meter. Physics, chemistry, and food labeling outside the US build on it. One British Thermal Unit equals 1055.055853 Joule (1 BTU = 1055.055853 J). British Thermal Unit to Joule conversion comes up most often in air conditioner and furnace ratings in the US and in US natural gas appliance specs, typically when figures need restating for physics and engineering calculations.

Precision and Rounding: Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15 British Thermal Unit equals 15825.83779 Joule.

15 BTU × 1055.055853 = 15825.83779 J

FAQ

How do I convert British Thermal Unit to Joule?

Multiply the British Thermal Unit value by 1055.055853 to get the equivalent value in Joule.

What is the formula for British Thermal Unit to Joule?

The formula is J = BTU × 1055.055853.

How many Joule are in 1 British Thermal Unit?

1 British Thermal Unit equals 1055.055853 Joule.

Can I convert Joule back to British Thermal Unit?

Yes. 1 Joule equals 0.0009478171203 British Thermal Unit, and the related converter can reverse the calculation.

What are common names for British Thermal Unit and Joule?

British Thermal Unit is shown as BTU and may also be searched as btu, british thermal unit. Joule is shown as J and may also be searched as joule, joules.

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