Convert Calories to BTU

Converting Calories (cal) to BTU (BTU) is a common task in energy measurements. Energy conversions connect food nutrition labels (calories), electricity bills (kWh), and scientific measurements in joules or BTU.

To convert, multiply the calories value by 0.00396565. Written as an equation: BTU = cal × 0.00396565.

One calories equals approximately 0.003966 BTU. This means you can multiply any cal value by 0.003966 to get the equivalent in BTU.

Worked example: 5 cal = 0.019828 BTU. Enter your own value in the converter above for instant results.

Common mistake: Food calories on nutrition labels are actually kilocalories (kcal), which confuses many people when comparing to joules or watt-hours.

Bookmark this page for quick cal to BTU conversions, or use the swap button to reverse the direction and convert BTU back to cal.