How do I convert J to BTU?

Use the formula shown above or enter a value to see J converted to BTU instantly.

What is the formula for J to BTU?

The converter calculates BTU by applying the category-specific conversion factor for Energy.

When should I use J vs BTU?

J and BTU are both part of the Energy category; pick the unit that matches your measurement context (e.g., scale, region, or industry standard).

Energy Conversion Guide

Convert J to BTU

Use the live converter below to translate between Joule (J) and British Thermal Unit (BTU). Scroll further for quick examples, formula tips, and related units.

Formula insight: Most unit conversions use a simple multiplication or division by a conversion factor. The calculator shows the exact formula used.

Convert

J → BTU

Joule

British Thermal Unit

0.0009

BTU

Rounded result (4 decimals max)

Formula

1 J = 0.0009 BTU

Conversion sourcesTap or click to view references

The International System of Units (SI) — NIST Special Publication 330
National Institute of Standards and Technology (NIST). The SI Brochure (SP 330) is the definitive English edition of the BIPM SI tables. NIST’s edition lists the official constants and conversion factors tying inch-pound units to SI, which SwapUnits applies for length, mass, temperature, pressure, volume, and related conversions. See /standards/nist-si-tenfold for the complete decimal multiple/submultiple table. View source · View SI table

Results update as you type. Swap the direction to convert back from BTU to J.

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J to BTU quick table

Multiply any row by the same factor to scale results. Use the converter above to enter exact values with your own units.

Joule (J)	British Thermal Unit (BTU)
0.25 J	0.0002 BTU
0.5 J	0.0005 BTU
1 J	0.0009 BTU
2 J	0.0019 BTU
5 J	0.0047 BTU
10 J	0.0095 BTU
25 J	0.0237 BTU
100 J	0.0948 BTU

BTU back to J

Keep the reciprocal handy when double-checking calculations or undoing a conversion.

British Thermal Unit (BTU)	Joule (J)
0.25 BTU	263.764 J
0.5 BTU	527.5279 J
1 BTU	1,055.0559 J
2 BTU	2,110.1117 J
5 BTU	5,275.2793 J
10 BTU	10,550.5585 J
25 BTU	26,376.3963 J
100 BTU	105,505.5853 J

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