1 Joule to Btu

1 J ≈ 0.00094782 Btu

Calculation: Btu = 1 J × 0.000947817 ≈ 0.00094782 Btu

Joule to Btu Converter

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How much energy is 1 J?

1 J is comparable to the energy of lifting a textbook one meter off the ground.

What does 1 J look like?

Comparable to the energy of lifting a textbook one meter off the ground
1 J is comparable to the energy of lifting a textbook one meter off the ground.

Did you know? Lifting an apple 1 meter is 1 J.

One joule is roughly the energy needed to lift a small apple (100 g) by 1 meter against gravity.

How to Convert Joule to Btu

1 joule = 0.000947817 Btu

Btu = Joule × 0.000947817

Example: 1 J × 0.000947817 = 0.00094782 Btu

Reverse Conversion

To convert Btu back to Joules:

  • Remember, 1 Btu equals 1055.06 Joules.
  • To convert 0.00094782 Btu to J, multiply 0.00094782 x 1055.06, resulting in 1 J.

1 J is also equal to:

  • 0.001 kilojoule
  • 0.00023901 calorie (nutritional)
  • 0.00027778 watt hour
About these units

Joule: SI unit of energy: 1 J = 1 N·m = 1 kg·m²·s⁻².

Btu: British thermal unit (IT) — legacy heat unit based on heating water.

Frequently Asked Questions

How much is 1 joule in Btu?

1 joule equals 0.00094782 Btu. This is calculated by multiplying 1 by the conversion factor 0.000947817.

What does 1 joule look like in Btu?

1 joule (0.00094782 Btu) is a small amount — the energy of striking a match head or a single heartbeat.

How do you calculate 1 joule to Btu?

Multiply 1 by the conversion factor 0.000947817. The calculation is 1 × 0.000947817 = 0.00094782 Btu. This factor is defined by international measurement standards.

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1 joule = 0.000947817 Btu
1 joule = 0.000947817 Btu — conversion chart

Nearby Conversions

2 Joules0.001896 Btu 3 Joules0.002843 Btu 4 Joules0.003791 Btu 5 Joules0.004739 Btu 6 Joules0.005687 Btu 7 Joules0.006635 Btu 8 Joules0.007583 Btu 9 Joules0.00853 Btu 10 Joules0.009478 Btu 11 Joules0.01043 Btu

For general conversions between Joules and Btu, see the Joules to Btu converter.

Also convert Joules to:

Conversion factors verified against NIST, BIPM, ISO 80000-4 1 cal_IT = 4.1868 J by definition (BIPM/ITS-90). Last reviewed: April 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.