British Thermal Units to Joules Converter

One British Thermal Unit equals 1055.055853 Joules (1 BTU = 1055.055853 J). Multiply a British Thermal Unit value by 1055.055853 to get the equivalent in Joules. The calculator is above; the formula and worked examples are below.

Formula

J = BTU × 1055.055853

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

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)
0.1105.5055853
0.5527.5279263
11055.055853
22110.111705
55275.279263
1010550.55853
2526376.39632
5052752.79263
100105505.5853
250263763.9632
500527527.9263
10001055055.853

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 Units × 1055.055853 = 10550.55853 Joules.
  4. Label the result as Joule (J).

Relative Size Comparison

1 British Thermal Unit
1 BTU
1 Joule0.0009478171203 British 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 Joules (1 BTU = 1055.055853 J). British Thermal Unit is used in air conditioner and furnace ratings in the US and in US natural gas appliance specs. Joule is used in 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

15British Thermal Units equals15825.83779Joules.

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 Joules.

What is the formula for British Thermal Unit to Joule?

The formula is J = BTU × 1055.055853.

How many Joules are in 1 British Thermal Unit?

1 British Thermal Unit equals 1055.055853 Joules.

Can I convert Joule back to British Thermal Unit?

Yes. 1 Joule equals 0.0009478171203 British Thermal Units, 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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