Calories to Joules

Instantly convert calories to joules using the exact thermochemical ratio of 4.184 joules per calorie

100 cal × 4.184 = 418.4000 J

Result

418.4 J

J = cal × 4.184

100cal418.40J

About this calculator

The calorie-to-joule converter uses the thermochemical calorie definition: 1 cal = 4.184 J exactly. This conversion is fundamental in chemistry and nutrition science, where energy is measured in calories but physics equations require joules. Enter any calorie value to instantly see its equivalent in joules.

Common examples

  • 1 cal = 4.184 J
  • 100 cal = 418.4 J
  • 250 cal = 1046 J
  • 1000 cal = 4184 J
  • 2500 cal = 10460 J