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Power and Energy

JtoBTU

Convert joules (J) to International Table BTUs (BTU).

Factor1 J = 0.0009478171 BTU

Converter

J

Accepts numbers or expressions, e.g. 150 + 14.7

Result
0.999947BTU

Rendered to 6 significant figures.

Formula

Formula
BTU = J × 0.0009478171

Multiply any value in joules by 0.0009478171 to obtain the value in International Table BTUs.

Worked example

Convert 1055 J to BTU.

  1. 01Start with 1055 J.
  2. 02Multiply by the conversion factor: 1055 × 0.0009478171 = 0.999947 BTU.
Result1055 J = 0.999947 BTU

Conversion table

JBTU
10.00094782
20.0018956
50.0047391
100.0094782
200.018956
500.047391
1000.094782
2000.18956
5000.47391
10000.94782

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from J to BTU?
1 J equals 0.0009478171 BTU. To convert, multiply the value in joules by 0.0009478171.
How do I convert 1 J to BTU?
1 J = 0.000947817 BTU. For any value, multiply by 0.0009478171.
How do I convert BTU back to J?
Divide by the same factor — or equivalently, multiply by 1055.056. So 1 BTU = 1055.06 J.
When would I need to convert joule to International Table BTU?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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