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calorie to British thermal unit

Live calorie (cal) to British thermal unit (BTU) converter. Plus a 10-value reference table and FAQs.

From cal

calorie

To BTU

British thermal unit

1 cal = 0.004BTU

Conversion table

Ten sample values from calorie to British thermal unit. Use the converter above for arbitrary values.

calorie (cal)	→	British thermal unit (BTU)
0.001 cal	→	3.9657e-6 BTU
0.01 cal	→	3.9657e-5 BTU
0.1 cal	→	0.000397 BTU
0.5 cal	→	0.001983 BTU
1 cal	→	0.003966 BTU
2 cal	→	0.007931 BTU
5 cal	→	0.019828 BTU
10 cal	→	0.039657 BTU
100 cal	→	0.396567 BTU
1,000 cal	→	3.965667 BTU

About the calorie

4.184 J. The energy to heat 1 g water by 1 °C.

About the British thermal unit

≈ 1055 J. HVAC in the US.

How calorie to British thermal unit conversion works

Both units belong to Energy. Unitbox first expresses the input in the category reference unit (J), then expresses that same quantity in British thermal unit.

The right unit depends on the convention used by your industry, country, instrument, or source document.

Reference value1 cal = 0.00396567 BTU

CalculationBrowser-side, using Unitbox's shared unit data

Review noteFor safety-critical work, verify against the governing standard or instrument manual.

Unit definitions and conversion factors are maintained in the Unitbox methodology. Last reviewed with the current conversion dataset.