Unit Converters · Browser · Free

Joules to BTU Conversion

Enter an amount of energy in joules and press Convert to see the same amount expressed in BTU. One joule equals about 0.00094781712 BTU.

What the converter does

Type a number of joules into the input field and press Convert. The tool divides that figure by exactly 1055.05585262 and shows the equivalent energy in BTU (IT), the unit this converter works in.

Press Copy to send the answer to your clipboard, or Clear to empty the field and start again with a different amount.

Joules to BTU formula

E(BTU) = E(J) / 1055.05585262 ≈ 0.00094781712 × E(J)

One BTU (IT) is defined as exactly 1055.05585262 joules, so dividing a joule figure by 1055.05585262 returns the same energy in BTU. The converter carries out that division by the exact definition and rounds only the figure it shows; about 0.00094781712 is the rounded reciprocal, quoted for reference.

Worked example

For 500 J: 500 / 1055.05585262 ≈ 0.473909 BTU. The same arithmetic covers any size — 10 J comes to about 0.009478 BTU, 100 J to 0.094782 BTU, and 1000 J to 0.947817 BTU.