How many kilocalories in 1 kJ?
1 kJ = 0.2390057361 kcal. The other way round: 1 kcal = 4.184 kJ. The kilojoule is the SI energy unit; EU and Australian food labels must show energy in kJ alongside kcal. The kilocalorie (the “Calorie” on food labels) is the energy needed to heat 1 kg of water by 1 °C; the thermochemical definition is exactly 4.184 kJ.
Kilojoules to kilocalories conversion table
1 kJ = 0.239 kcal · 2 kJ = 0.478 kcal · 3 kJ = 0.717 kcal · 4 kJ = 0.956 kcal · 5 kJ = 1.195 kcal · 6 kJ = 1.434 kcal · 7 kJ = 1.673 kcal · 8 kJ = 1.912 kcal · 9 kJ = 2.1511 kcal · 10 kJ = 2.3901 kcal · 12 kJ = 2.8681 kcal · 15 kJ = 3.5851 kcal · 20 kJ = 4.7801 kcal · 25 kJ = 5.9751 kcal · 30 kJ = 7.1702 kcal · 40 kJ = 9.5602 kcal · 50 kJ = 11.9503 kcal · 75 kJ = 17.9254 kcal · 100 kJ = 23.9006 kcal · 1,000 kJ = 239.0057 kcal
How to convert kilojoules to kilocalories
Divide the value by 4.184. Example: 37 kJ = 8.8432 kcal.
Unit Converter
How to use
- 1Pick a category — length, weight, temperature, volume, area, speed, data, time, pressure or energy.
- 2Choose the “from” and “to” units, or press swap to reverse them.
- 3Type a value in either field — the other side updates as you type.
- 4Adjust the decimal precision and check the conversion table for common values.
Exact conversion factors
Many imperial units are defined exactly in metric terms: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1.609344 km, 1 pound = 0.45359237 kg and 1 US gallon = 3.785411784 litres. The converter uses these definitions, so results are as precise as the decimals you choose to show. The formula is displayed in words — for example “multiply by 2.54” — so you can repeat the calculation by hand.
Temperature is different
Celsius, Fahrenheit and Kelvin do not share a zero point, so temperature cannot be converted with a single factor. °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9; Kelvin is Celsius + 273.15. That is why 0 °C is 32 °F, while a 10-degree change in Celsius is an 18-degree change in Fahrenheit.
US vs UK units and data sizes
A US gallon (3.785 L) is smaller than an imperial UK gallon (4.546 L), and US fluid ounces differ slightly from UK ones — check which system your recipe or spec uses. For data sizes, storage makers use decimal units (1 GB = 1,000 MB), while operating systems often count in binary units (1 GiB = 1,024 MiB), which is why a new drive shows less capacity than the label.
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 cm. To convert cm to inches, divide by 2.54.
How do I convert kg to pounds?
Multiply kilograms by about 2.20462. One pound is exactly 0.45359237 kg.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 20 °C × 1.8 + 32 = 68 °F.
Can I convert in both directions?
Yes. Type in either field and the other updates, or press swap to switch the units.
Not happy with the results?
Talk to Webin Agency about fast, SEO-friendly websites, e-commerce and Google Ads management.