How many kilocalories are in 1 BTU?

1 BTU (International Table) is approximately 0.251996 International Table kilocalories. For quick mental math, use 1 BTU ≈ 0.252 kcal (IT).

A British Thermal Unit (BTU) is the amount of heat needed to raise one pound of water by 1°F. It is widely used in the US for heating, cooling, and fuel energy ratings.

Which kilocalorie convention does this tool use?

This tool uses the International Table kilocalorie, equal to 4,186.8 J. The thermochemical or nutritional kilocalorie is commonly treated as 4,184 J, so it has a slightly different conversion factor.

Is this the IT or thermochemical BTU?

This converter pairs the International Table (IT) BTU with the IT kilocalorie: 1 BTU (IT) ≈ 0.251996 kcal (IT). Thermochemical units use different joule definitions.

BTU to Kilocalories Converter

Convert International Table BTU to International Table kilocalories. 1 BTU (IT) ≈ 0.251996 kcal (IT).

BTU to Kilocalories

1 BTU (IT) ≈ 0.251996 kcal (IT)

BTU

International Table kilocalories (kcal IT)

Enter a BTU value on the left to see the result

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Summary

Convert International Table BTU to International Table kilocalories. 1 BTU (IT) ≈ 0.251996 kcal (IT).

How it works

Enter a BTU value in the input field.
The converter multiplies by 0.251996 to get kilocalories.
The result appears instantly — no button needed.
Use the swap button to convert kcal back to BTU.
Click Reset to clear both fields.

Use cases

Convert heating system output from BTU to kcal for international specs.
Compare engineering heat-energy data stated in BTU (IT) and kcal (IT).
Calculate HVAC energy consumption in kilocalories for metric-system reports.
Verify fuel energy content when comparing US and European datasheets.

Frequently Asked Questions

Last updated: 2026-09-19 · Reviewed by Nham Vu