Joules to Calories
Convert joules to calories and back, bridging physics problems and nutrition labels.
=
Common values
Formula
cal = J × 0.2390057361
One calorie is 4.184 J — the heat to raise 1 g of water by 1 °C. A food "Calorie" is 1,000 of these.
Frequently asked questions
QHow many cal is 1 J?
1 J is 0.239 cal, and 10 J is 2.39 cal. Type any value in the box above to convert instantly.
QAnd how many J is 1 cal?
1 cal is 4.184 J. This converter works both ways, so typing in the right box updates the left one.
QWhere is this unit used?
One calorie is 4.184 J — the heat to raise 1 g of water by 1 °C. A food "Calorie" is 1,000 of these.
Other converters
Traditional units (geun, doe, majigi and so on) vary by region and product.