NiftyRecipe Online energy conversion
BTU/kWh 0.000293 MJ/kcal 239.005736 kJ/MJ 0.001 kWh/BTU 3412.141633 cal/kWh 0.000001 kcal/cal 1000
J / cal

40 joules in calorie

9.560229 calorie

1 J = 0.239006 cal · factor

Reverse: 1 calorie ≈ 4.184 joule. Use the reference table for common values.

Enter a value and click Calculate - opens the page with the new result

Common values

calorie to joule 1 joule in calorie 2 joules in calorie 3 joules in calorie 4 joules in calorie 5 joules in calorie 6 joules in calorie 8 joules in calorie 10 joules in calorie 12 joules in calorie 15 joules in calorie

Related converters

J → kcal J → kJ
Formula: joule to calorie

cal = J × 0.239006 (1 J = 0.239006 CAL)

Reference values: joule → calorie
J cal
1 J 0.239006 cal
100 J 23.900574 cal
200 J 47.801147 cal
500 J 119.502868 cal
1000 J 239.005736 cal
2000 J 478.011472 cal

All amounts for this pair

FAQ for J → cal
40 joules in calorie

NiftyRecipe converts 40 joules to 9.560229 calorie with a fixed SI-linked factor.

Kilojoules and megajoules describe energy on a scientific scale. The ratio applied here is 1 joule = 0.239006 calorie, so this amount is 9.560229 calorie. Reverse check: 1 calorie ≈ 4.184 joule. That helps when a lab notebook or spreadsheet only lists one column.

Change the value in the calculator for homework, datasheets or rough process estimates. The wording stays technical on purpose so these pages read differently from food-label articles on the same site.