About Kilocalories to Kilojoules Converter
This converter turns kilocalories into kilojoules. One kilocalorie is 4.184 kilojoules. It is free, needs no sign-up and runs in your browser, so nothing you enter is uploaded.
To convert by hand, multiply the number of kilocalories by 4.184. For example, 10 kcal × 4.184 = 41.84 kJ. To go back, multiply kilojoules by 0.23900574. For a rough mental estimate, multiply by about 4.2, which is off by about 0.4 percent.
One kilocalorie is 4,184 J. The calorie here is the thermochemical calorie, exactly 4.184 J, and a kilocalorie is 4,184 J. One kilowatt-hour is exactly 3,600,000 J.
How to use Kilocalories to Kilojoules Converter
- Choose a group such as Length or Temperature from the Quantity picker. It opens on a worked conversion.
- Type the value you want to convert in the From box. Decimals and negative numbers are fine.
- Pick the unit you have in the From list and the unit you want in the To list. The swap button reverses the pair.
- Read the result in the result card, and use the copy button to put it on your clipboard.
- Set Precision to Auto, or to a fixed number of decimals from 0 to 10, if you need a specific rounding.
- Check the formula line and the chart of common values under the result when you want to see how the number was reached.
Features
- 102 units in 15 groups, from nanometers and light-years to square miles, and from bits to tebibytes. It includes milligrams, UK gallons and pints, cubic meters, feet and inches, degrees and radians, hertz and rpm, and bits per second to MB/s.
- Results update as you type, with a swap button to reverse the pair.
- Precision control: Auto (up to 8 significant digits) or 0 to 10 fixed decimals.
- A copy button for the result.
- The formula and the factor in both directions, shown under the result.
- A chart of common values (1, 2, 5, 10, 20, 25, 50, 75, 100, 250, 500 and 1,000) for the pair you chose.
- Temperature handled with proper offset formulas, plus the UK gas mark oven table.
- Fuel economy handled as an inverse, so US and UK miles per gallon and liters per 100 km convert correctly.
- Bangladesh land units: decimal (shotangsho), katha and bigha.
- Both decimal data units (KB, MB, GB, TB) and binary ones (KiB, MiB, GiB, TiB), clearly labeled.
Kilocalories to kilojoules formula
To convert kilocalories to kilojoules, multiply the value by 4.184.
To go the other way, multiply kilojoules by 0.23900574, which is the same as dividing by 4.184.
kJ = kcal × 4.184Worked examples
10 kcal gives 41.84 kJ
10 × 4.184 = 41.84
1,000 kcal gives 4,184 kJ
1,000 × 4.184 = 4,184
2,000 kcal gives 8,368 kJ
2,000 × 4.184 = 8,368
Kilocalories to kilojoules conversion chart
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 | 4.184 |
| 10 | 41.84 |
| 50 | 209.2 |
| 100 | 418.4 |
| 200 | 836.8 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
| 1,500 | 6,276 |
| 2,000 | 8,368 |
| 2,500 | 10,460 |
| 3,000 | 12,552 |
Privacy: how it works
- Every conversion is calculated by code running in your browser tab. The values you type are never sent to Ulkaa or anyone else, and nothing is stored.
- There is no account and no sign-up for this tool, and it costs nothing to use.
Tips
- Use the swap button instead of retyping when you need the reverse conversion.
- For a quick mental check, round the factor: 1 inch is about 2.5 cm, 1 kg is about 2.2 lbs, 1 mile is about 1.6 km.
- Set Precision to 2 decimals for cooking, shopping and travel, and to 6 or more for engineering work.
- Check whether a figure uses US or imperial units before converting volumes, gallons and miles per gallon.
- For land, convert for a rough size, then confirm the area from the deed or survey record.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial and no credit card. Ulkaa Tool does the work with your own device, so there is no server bill to pass on to you.
Do I need an account?
No. There is no sign-up and no login. Open the page and use it. An Ulkaa account is not needed for anything on this tool.
Does it run in my browser?
Yes. Your values are processed by code running in your browser tab, on your own device.
Is my data uploaded?
No. Your values are never sent to Ulkaa or to anyone else. You can check this yourself by watching the Network tab in your browser developer tools while you use the tool.
How many kilojoules are in a kilocalorie?
One kilocalorie is 4.184 kilojoules.
How many kilocalories are in a kilojoule?
One kilojoule is 0.239006 kilocalories.
How do I convert kilocalories to kilojoules by hand?
Multiply the value in kilocalories by 4.184. For example, 10 kcal is 41.84 kJ. To reverse it, divide by 4.184.
Is a calorie the same as the Calorie on a food label?
No. The Calorie on a food label is a kilocalorie (kcal), which is 1,000 calories or 4.184 kJ. The calorie on this page is the small calorie of exactly 4.184 J.
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