Kilocalories to Kilojoules Converter
Convert Kilocalories to Kilojoules with the exact conversion factor, a worked example and a quick-reference table. Runs entirely in your browser.
This converter turns Kilocalories into Kilojoules instantly using the standard definition of both units. It includes the formula, a worked example, and a quick table for common amounts, and it works for any value you type — including decimals and negatives where they make sense.
Quick reference — Kilocalories to Kilojoules
How to use this calculator
- Enter the value in Kilocalories in the input box.
- Read the result in Kilojoules — it updates as you type.
- Use the Swap button to convert in the opposite direction.
- Check the quick-reference table for common Kilocalories amounts.
The formula
Kilojoules = Kilocalories × 4.184
Worked example
1 kcal = 4.184 kJ — in full, 1 Kilocalories converts to 4.184 Kilojoules. Food energy, electricity bills and heating are the everyday jobs for this conversion.
Frequently Asked Questions
How do I convert Kilocalories to Kilojoules?
Multiply the value in Kilocalories by 4.184. For example, 1 Kilocalories × 4.184 = 4.184 Kilojoules. To go the other way, divide by 4.184 instead — or press Swap in the converter above.
How many Kilojoules are in one Kilocalorie?
One Kilocalorie equals 4.184 Kilojoules. Scaling up, 10 Kilocalories = 41.84 Kilojoules and 100 Kilocalories = 418.4 Kilojoules. The converter uses the full-precision factor, so typed values are more precise than the rounded figure quoted here.
Which is bigger, a Kilocalorie or a Kilojoule?
A Kilocalorie is bigger. One Kilocalorie equals 4.184 Kilojoules, while one Kilojoule is only 0.239006 Kilocalories. So a measurement that looks larger in Kilojoules is reflecting the scale difference, not an error.
What is 1 Kilocalories in Kilojoules?
1 Kilocalories is 4.184 Kilojoules. The math is 1 × 4.184 = 4.184. Try any other amount in the converter above and the result updates as you type.