Convert Energy
Convert energy, for example kilocalories and kilojoules on food labels or kilowatt-hours on your electricity bill.
1 kcal = 4.184 kJ
Food labels often say “calories” but mean kilocalories.
In all units
- joules
- 4’184 J
- kilojoules
- 4.184 kJ
- calories
- 1’000 cal
- kilocalories
- 1 kcal
- watt-hours
- 1.16222 Wh
- kilowatt-hours
- 0.00116222 kWh
- BTU
- 3.96567 BTU
Popular conversions
Frequently asked questions
How accurate are the results?
Calculations use the defined conversion factors, e.g. 1 inch = 2.54 cm and 1 pound (lb) = 0.45359237 kg. Six significant digits are shown.
How much is a pound?
The English pound (lb) weighs 453.59 grams. In everyday use in Switzerland and Germany, “ein Pfund” (a pound) often means 500 grams; both are available.
Why does my computer show fewer GB than on the box?
Manufacturers calculate 1 GB = 1000 MB, Windows uses 1024 (actually GiB). Windows therefore shows a 1 TB hard drive as about 931 “GB”.
More tools in this category
- Percentage calculator Work out percentages, discounts and mark-ups.
- Roman numerals Numbers to Roman numerals and back.
- Rule of three Direct and inverse proportion with working.
- Average & median Mean, median, standard deviation, quartiles.
- Swiss VAT calculator Calculate VAT with the Swiss rates.
- Time calculator Decimal hours, working time, adding up times.