⚡ Energy converter

Calorie to BTU Converter

Convert calories (cal) to BTU (BTU) instantly with the exact formula, a conversion table and chart.

cal

Results

Btu
0.00396566683139 BTU
Same value in every unit

📊 Calorie to BTU chart

Calorie to BTU — plotted against calorie (cal).

How to convert calories to BTU

To convert calories to BTU, multiply by 0.00396566683139. Energy conversions connect nutrition, electricity bills, heating systems and physics.

BTU = cal × 0.00396566683139 cal = BTU ÷ 0.00396566683139
Calorie to BTU conversion – cal to BTU formula illustration
Calorie (cal) → BTU (BTU) at a glance.

Calorie to BTU conversion table

Calorie (cal)BTU (BTU)
0.1 cal0.000396566683139 BTU
0.5 cal0.0019828334157 BTU
1 cal0.00396566683139 BTU
2 cal0.00793133366278 BTU
3 cal0.0118970004942 BTU
4 cal0.0158626673256 BTU
5 cal0.019828334157 BTU
10 cal0.0396566683139 BTU
20 cal0.0793133366278 BTU
25 cal0.0991416707848 BTU
50 cal0.19828334157 BTU
100 cal0.396566683139 BTU
500 cal1.9828334157 BTU
1,000 cal3.96566683139 BTU

About the units

Calorie (cal)

A (small) thermochemical calorie is exactly 4.184 joules.

BTU (BTU)

The International Table British thermal unit is about 1,055.06 joules, used for HVAC and heating.

How to use this converter

  1. Type the number of calories (cal) in the input box.
  2. The result in BTU appears instantly — no button needed.
  3. See the same value in every other energy unit just below.
  4. Use “Swap units” to convert BTU back to calories.

Tips for better results

  • Double-check which system a unit belongs to (for example US vs UK gallons).
  • Use the swap button to convert in the opposite direction instantly.
  • Bookmark the conversions you use most — each pair has its own page.

Frequently asked questions

How many BTU are in one calorie?

One calorie equals 0.00396566683139 BTU. 0.00396566683139 is the exact factor used by this converter.

How do I convert calories to BTU?

Multiply the value in calories by 0.00396566683139. To go the other way, multiply BTU by 252.164400722.

What is 10 cal in BTU?

10 cal = 0.0396566683139 BTU. Also, 5 cal = 0.019828334157 BTU and 100 cal = 0.396566683139 BTU.

What is the difference between a calorie and a btu?

A (small) thermochemical calorie is exactly 4.184 joules. The International Table British thermal unit is about 1,055.06 joules, used for HVAC and heating.

Is this tool free and private?

Yes — the Calorie to BTU is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

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