How many British thermal units are in 1 joule?

1 joule equals 0.000947817 BTU.

How do I convert British thermal units back to joules?

Use the reverse converter: 1 British thermal unit equals 1055.06 J.

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert joules to British thermal units, multiply the value by 0.00094781712.

BTU = J × 0.00094781712

40 J × 0.00094781712 = 0.03791 BTU

Joule (J): The SI unit of energy, one newton-metre, named after James Prescott Joule.
British Thermal Unit (BTU): Used for heating, cooling and gas in the US. The IT BTU is about 1,055.056 joules.

How do I convert joules to British thermal units?: To convert joules to British thermal units, multiply the value by 0.00094781712.
How many British thermal units are in 1 joule?: 1 joule equals 0.000947817 BTU.
How many British thermal units are in 10 joules?: 10 J equals 0.00947817 BTU.
How do I convert British thermal units back to joules?: Use the reverse converter: 1 British thermal unit equals 1055.06 J.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.