BTU to Joules Converter
Quick answer: To convert BTU to joules, multiply by 1,055.056. For example, 10 Btu is 10,550.56 J. One british thermal unit equals 1,055.056 J.
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Use the BTU to Joules Converter
BTU to Joules formula and what each symbol means
J = Btu × 1,055.056
| Symbol | Meaning |
|---|---|
| Btu | British thermal unit |
| J | Joule |
BTU to Joules examples
1 Btu
1 Btu × 1,055.056 = 1,055.056 J.
10 Btu
10 Btu × 1,055.056 = 10,550.56 J.
100 Btu
100 Btu × 1,055.056 = 105,505.6 J.
BTU compared with Joules
One Btu is 1,055 times as large as one J, so your number gets bigger when you convert BTU to joules and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About BTU and joules
British thermal unit (Btu): International Table British thermal unit, 1,055.05585262 joules. Joule (J): The SI unit of energy, one newton metre.
Where BTU to joules conversions are used
Gas and heating are often billed in therms, BTU or megajoules. Engineering and physics calculations usually work in joules.
How to calculate BTU to Joules step by step
- Enter the value in Btu (the starting unit).
- Multiply by 1,055.056, because 1 Btu = 1,055.056 J.
- The product is the value in J. To go back, divide by 1,055.056 or multiply by 0.0009478171.
Popular energy conversions
How to read your BTU to Joules result
Quick estimate: multiply by about 1,060 to get joules from BTU; this is within 0.5% of the exact factor. The joule is the SI unit of energy.
| BTU | JOULES |
|---|---|
| 1 | 1,055.056 |
| 2 | 2,110.112 |
| 5 | 5,275.279 |
| 10 | 10,550.56 |
| 20 | 21,101.12 |
| 50 | 52,752.79 |
| 100 | 105,505.6 |
| 1,000 | 1,055,056 |
Joules to BTU: quick table
| JOULES | BTU |
|---|---|
| 1 | 0.0009478171 |
| 5 | 0.004739086 |
| 10 | 0.009478171 |
| 25 | 0.02369543 |
| 50 | 0.04739086 |
| 100 | 0.09478171 |
| 250 | 0.2369543 |
| 500 | 0.4739086 |
Common mistakes when calculating BTU to Joules
- Confusing kW (power) with kWh (energy).
- Dividing when you should multiply: from Btu to J multiply by 1,055.056; from J to Btu divide by 1,055.056.
BTU to Joules FAQ
How many J are in 1 Btu?
1 Btu equals 1,055.056 J.
How many Btu are in 1 J?
1 J equals 0.0009478171 Btu.
Is 1 Btu = 1,055.056 J an exact conversion?
Yes. The british thermal unit and the joule are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 1,055.056 is just that ratio shown to 7 significant figures.
What is a joule (J)?
The SI unit of energy, one newton metre.
How can I estimate BTU to joules in my head?
Quick estimate: multiply by about 1,060 to get joules from BTU; this is within 0.5% of the exact factor.
What is 75 Btu in joules?
75 Btu = 79,129.19 J (since 75 × 1,055.056).
What is 300 Btu in joules?
300 Btu = 316,516.8 J (since 300 × 1,055.056).
What is 12 Btu in joules?
12 Btu = 12,660.67 J (since 12 × 1,055.056).
How many decimals should I keep when converting Btu to J?
Match the precision of your original measurement. For example, 10,550.56 J rounds to 10,600 J at 3 significant figures; keep more digits only for engineering or scientific work.
More in Energy converters
- BTU to kWh Converter
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- kWh to Joules Converter
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- kWh to Calories Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors