NiftyRecipe Online energy conversion
kJ/cal 239.005736 BTU/cal 252.164401 kcal/MJ 0.004184 MJ/kcal 239.005736 cal/kJ 0.004184 cal/MJ 0.000004
Converter

Calorie and energy unit converter

Convert kilocalories, calories, kilojoules, megajoules, kilowatt-hours and BTU. Fixed factors - enter a value or pick a popular conversion below.

Quick calorie conversion

Convert Kilocalorie to Kilojoule

1 kcal = 4.184 kJ · factor

Common values

50 kcal 2000 kcal 1 kcal 200 kcal 100 kcal 120 kcal 10 kcal 1000 kcal

Converter Kilocalorie → Kilojoule

Popular conversions

Jump to common amounts. Factors are fixed physical ratios, not market rates.

100 kcal → kJ 120 kcal → cal 200 kcal → cal 500 kcal → kJ 1000 kcal → kJ 500 kJ → kcal 1000 kJ → kcal 1 kWh → kcal 1 kWh → MJ 1000 BTU → kWh 8600 kcal → BTU 1 BTU → kcal 2000 kcal → kJ

Food labels and calorie questions

What kJ and kcal mean on food labels Calorie vs kilocalorie (cal vs kcal) How to convert kJ to kcal

Browse all energy units

How we convert energy units

All calculators use the same fixed chain (thermochemical kcal = 4184 J). No live electricity tariffs.

Kilocalorie (kcal)
1 kcal (thermochemical) = 4184 J. On food labels, “Calorie” usually means kilocalorie.
Kilojoule (kJ)
1 kcal ≈ 4.184 kJ. Many regions print both kcal and kJ on nutrition labels.
Kilowatt-hour (kWh)
1 kWh = 3.6 MJ exactly (electrical energy). Converting to kcal is a physical equivalence, not a utility bill.
BTU
British thermal unit (IT): used in heating and AC ratings. Converted via fixed energy factors on this site.

Full methodology and sources

Common questions
Are energy conversion factors fixed?

Yes. Unlike currency rates, energy unit factors on NiftyRecipe are physical constants (for example 1 kWh = 3.6 MJ). Results do not change by market time of day.

What is the difference between a calorie and a kilocalorie?

1 kilocalorie (kcal) = 1000 small calories (cal). On food packs, “Calorie” almost always means kcal. Example: 120 kcal = 120000 cal.

How do I convert kWh to kcal?

Use the kilowatt-hour → kilocalorie calculator. Roughly 1 kWh ≈ 860 kcal (thermochemical). The on-page factor shows the exact value used here.

Can I convert any amount?

Yes. Enter a value in the calculator or open a dedicated URL such as 100 kcal to kJ or 120 kcal to calories. Nearby amount links help you jump to common totals.

What does kJ mean on a food label or KBJU table?

kJ is kilojoule, the SI energy unit printed next to kcal on many packs (often per 100 g). 1 kcal ≈ 4.184 kJ. It is the same food energy, not a different nutrient.