How do I convert BTU to J?

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

What is the formula for BTU to J?

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

When should I use BTU vs J?

BTU and J 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 BTU to J

Use the live converter below to translate between British Thermal Unit (BTU) and Joule (J). 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

BTU → J

British Thermal Unit

BTU

Joule

1,055.0559

Rounded result (4 decimals max)

Formula

1 BTU = 1,055.0559 J

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 J to BTU.

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BTU to J quick table

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

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

J back to BTU

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

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

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