How many British thermal units are in a joule?

1 J = 0.000948 BTU. To convert any amount, multiply by 0.000948.

How do you convert joules to British thermal units?

Multiply the number of joules by 0.000948 to get British thermal units. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Energy

Joules to British thermal units converter

Convert joules (J) to British thermal units (BTU). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert joules to British thermal units— the formula

Joules convert to British thermal units by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

BTU = J × 0.000948

J = BTU × 1055.06

Joule: SI derived. 1 cal (thermochemical) = 4.184 J exactly; 1 kcal = 1000 cal. 1 kWh = 3,600,000 J exactly. 1 BTU (IT) = 1055.05585262 J (NIST SP 811).

Questions

Frequently asked questions

How many British thermal units are in a joule?
1 J = 0.000948 BTU. To convert any amount, multiply by 0.000948.
How do you convert joules to British thermal units?
Multiply the number of joules by 0.000948 to get British thermal units. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.