kJ to Calories Converter
Quick answer: To convert kJ to calories, multiply by 239.0057. For example, 10 kJ is 2,390.057 cal. One kilojoule equals 239.0057 cal.
- Calculator
- Formula
- Examples
- Size compared
- About the units
- Where used
- Step by step
- Popular conversions
- Reading your result
- Mistakes
- FAQ
- Related tools
- Method
Use the kJ to Calories Converter
kJ to Calories formula and what each symbol means
cal = kJ × 239.0057
| Symbol | Meaning |
|---|---|
| kJ | Kilojoule |
| cal | Calorie |
kJ to Calories examples
1 kJ
1 kJ × 239.0057 = 239.0057 cal.
10 kJ
10 kJ × 239.0057 = 2,390.057 cal.
100 kJ
100 kJ × 239.0057 = 23,900.57 cal.
kJ compared with Calories
One kJ is 239 times as large as one cal, so your number gets bigger when you convert kJ to calories and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About kJ and calories
Kilojoule (kJ): 1,000 joules. Calorie (cal): The thermochemical calorie, exactly 4.184 joules.
Where kJ to calories conversions are used
Food labels show kilocalories or kilojoules, and electricity bills use kilowatt-hours. Gas and heating are often billed in therms, BTU or megajoules.
How to calculate kJ to Calories step by step
- Enter the value in kJ (the starting unit).
- Multiply by 239.0057, because 1 kJ = 239.0057 cal.
- The product is the value in cal. To go back, divide by 239.0057 or multiply by 0.004184.
Popular energy conversions
How to read your kJ to Calories result
Quick estimate: multiply by about 240 to get calories from kJ; this is within 0.5% of the exact factor. One kilocalorie is exactly 4,184 J and one kilowatt hour is exactly 3.6 million joules.
| KJ | CALORIES |
|---|---|
| 1 | 239.0057 |
| 2 | 478.0115 |
| 5 | 1,195.029 |
| 10 | 2,390.057 |
| 20 | 4,780.115 |
| 50 | 11,950.29 |
| 100 | 23,900.57 |
| 1,000 | 239,005.7 |
Calories to kJ: quick table
| CALORIES | KJ |
|---|---|
| 1 | 0.004184 |
| 5 | 0.02092 |
| 10 | 0.04184 |
| 25 | 0.1046 |
| 50 | 0.2092 |
| 100 | 0.4184 |
| 250 | 1.046 |
| 500 | 2.092 |
Common mistakes when calculating kJ to Calories
- Mixing the small calorie (cal) with the food Calorie (kcal): the difference is a factor of 1,000.
- Dividing when you should multiply: from kJ to cal multiply by 239.0057; from cal to kJ divide by 239.0057.
kJ to Calories FAQ
How many cal are in 1 kJ?
1 kJ equals 239.0057 cal.
How many kJ are in 1 cal?
1 cal equals 0.004184 kJ.
Is 1 kJ = 239.0057 cal an exact conversion?
Yes. The kilojoule and the calorie are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 239.0057 is just that ratio shown to 7 significant figures.
What is a kilojoule (kJ)?
1,000 joules.
How can I estimate kJ to calories in my head?
Quick estimate: multiply by about 240 to get calories from kJ; this is within 0.5% of the exact factor.
What is 80 kJ in calories?
80 kJ = 19,120.46 cal (since 80 × 239.0057).
What is 500 kJ in calories?
500 kJ = 119,502.9 cal (since 500 × 239.0057).
What is 15 kJ in calories?
15 kJ = 3,585.086 cal (since 15 × 239.0057).
How many decimals should I keep when converting kJ to cal?
Match the precision of your original measurement. For example, 2,390.057 cal rounds to 2,390 cal at 3 significant figures; keep more digits only for engineering or scientific work.
More in Energy converters
- kJ to kWh Converter
- Kilocalories to kJ Converter
- kWh to BTU Converter
- Kilocalories to Joules Converter
- kWh to Calories Converter
- Kilocalories to Calories Converter
See all energy converters tools · All Conversion calculators · Site map
Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors