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Result
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Uses the thermochemical calorie of 4.184 J exactly. Food labels worldwide use the kilocalorie, so a label reading 250 calories means 250 kcal, or 1,046 kJ.

Quick reference
kcalkJkJkcal
100418.410023.9
2501046500119.5
50020921000239
100041842000478
1500627641841000
2000836883682000
250010460100002390.1
300012552120002868.1
Calories to Kilojoules Converter by MyLoanMath