Convert dietary kilocalories (kcal, Cal) and kilojoules using the common 4.184 factor.
The page uses the thermochemical definition 1 kcal = 4.184 kJ (exact) in both directions; inputs must be non‑negative.
This calculator uses plain decimal numbers. If a result looks wrong, check whether you used a comma instead of a dot (or vice versa) where the field expects one.