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Calorie to British thermal unit

Convert Calorie to British thermal unit and get the exact value instantly.

About this conversion

To convert Calorie to British thermal unit, multiply the number of Calorie by 0.003965666831.

Energy shows up as joules, calories, kilowatt-hours or BTU depending on the field (nutrition, an electricity bill, heating or physics), so a conversion makes the numbers comparable.

Conversion table

Calorie (cal)British thermal unit (BTU)
1 cal0.003965666831 BTU
2 cal0.007931333663 BTU
5 cal0.01982833416 BTU
10 cal0.03965666831 BTU
100 cal0.3965666831 BTU

How to use this converter

  1. Enter your Calorie value

    Type any number into the Calorie field. It starts at 1 so you can read the rate straight away.

  2. Read the British thermal unit result

    The amount in British thermal unit updates as you type, so there is no button to press and nothing to wait for.

  3. Swap or keep exploring

    Use the swap control to flip the direction, or pick a related conversion from the list below.

Frequently asked

How many British thermal unit are in one Calorie?
One Calorie equals 0.003965666831 BTU. Enter any amount above to get an exact figure for your own value.
Is this converter accurate?
Yes. It uses the exact international definition of each unit and computes on your device, so the only rounding is for display.
Do you upload the numbers I enter?
No. The Calorie to British thermal unit conversion runs entirely in your browser tab, and nothing you type is sent to a server.
Does it work on my phone?
Yes. It runs in any modern mobile browser and keeps working offline once the page has loaded.

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