Kilocalories to kilojoules conversion table
Every row is computed with the exact factor the converter above uses:
1 kcal = 4.184 kJ (kJ = kcal × 4.184).
Looked-up values are rounded to 1 decimal;
type any amount into the tool for other kilocalories values.
| kcal | kJ |
|---|---|
| 1 kcal | 4.2 kJ |
| 2 kcal | 8.4 kJ |
| 5 kcal | 20.9 kJ |
| 10 kcal | 41.8 kJ |
| 15 kcal | 62.8 kJ |
| 20 kcal | 83.7 kJ |
| 25 kcal | 104.6 kJ |
| 30 kcal | 125.5 kJ |
| 40 kcal | 167.4 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 150 kcal | 627.6 kJ |
| 200 kcal | 836.8 kJ |
| 250 kcal | 1,046 kJ |
| 300 kcal | 1,255.2 kJ |
| kcal | kJ |
|---|---|
| 350 kcal | 1,464.4 kJ |
| 400 kcal | 1,673.6 kJ |
| 450 kcal | 1,882.8 kJ |
| 500 kcal | 2,092 kJ |
| 550 kcal | 2,301.2 kJ |
| 600 kcal | 2,510.4 kJ |
| 650 kcal | 2,719.6 kJ |
| 700 kcal | 2,928.8 kJ |
| 750 kcal | 3,138 kJ |
| 800 kcal | 3,347.2 kJ |
| 850 kcal | 3,556.4 kJ |
| 900 kcal | 3,765.6 kJ |
| 950 kcal | 3,974.8 kJ |
| 1000 kcal | 4,184 kJ |
| 1100 kcal | 4,602.4 kJ |
| kcal | kJ |
|---|---|
| 1200 kcal | 5,020.8 kJ |
| 1300 kcal | 5,439.2 kJ |
| 1400 kcal | 5,857.6 kJ |
| 1500 kcal | 6,276 kJ |
| 1600 kcal | 6,694.4 kJ |
| 1800 kcal | 7,531.2 kJ |
| 2000 kcal | 8,368 kJ |
| 2200 kcal | 9,204.8 kJ |
| 2500 kcal | 10,460 kJ |
| 2800 kcal | 11,715.2 kJ |
| 3000 kcal | 12,552 kJ |
| 3500 kcal | 14,644 kJ |
| 4000 kcal | 16,736 kJ |
| 5000 kcal | 20,920 kJ |
| 10000 kcal | 41,840 kJ |
Going the other way? Use the kilojoules to kilocalories converter.
Calories in, kilojoules out
One kilocalorie is 4.184 kilojoules. That’s the only number this tool needs. Type a kcal value and the kJ equivalent lands instantly, no submit step, no menu to navigate.
So a 200 kcal snack is 836.8 kJ. A 2000 kcal daily target is 8368 kJ. And a single 50 kcal yogurt comes out to 209.2 kJ. Multiply kcal by 4.184 and you’re done, since the relationship is a clean constant with no offset or formula.
When you’d actually need this
Here’s a thing that trips people up: the “Calorie” on a US or UK food label is really a kilocalorie. So if your fitness app, your recipe, or your diet plan counts in Calories but you need to log energy in kilojoules, this is the conversion that bridges them. A meal you logged as 650 Calories is 2719.6 kJ.
Diet tracking across regions is the common scenario. You might count calories day to day but then read a product made for the Australian or European market, where the headline figure is kJ. Converting the other direction (your kcal target into kJ) lets you compare apples to apples. A 1800 kcal cut translates to 7531 kJ, which you can then check directly against a kJ-labeled product.
Numbers you’ll reuse
Most everyday lookups sit in a tight range: 100 kcal is 418.4 kJ, 500 kcal is 2092 kJ, and 1000 kcal is 4184 kJ. The one to anchor on is 2000 kcal, the familiar daily reference in the US and UK, which maps to 8368 kJ, close to the 8700 kJ figure Australian labels use. The dense table up top already has these worked out, and the free field takes any value in between.
How to use it
Enter a kilocalorie value and read the kilojoules as you type. There’s no button, the result just updates. The reference table above has common amounts pre-calculated, so for standard figures you can skip typing. Every calculation runs in your browser using the exact 4.184 factor, so nothing you enter is uploaded and it keeps working offline once the page loads.
For a rough head estimate, multiply kcal by 4 instead of 4.184. It undershoots the kJ a little (by about 4.4%), which is fine for a ballpark. When the exact figure matters, the tool applies the full constant.
FAQ
How many kJ in a kcal?
Exactly 4.184 kilojoules per kilocalorie. So you multiply your kcal figure by 4.184 to get kilojoules.
Is a Calorie the same as a kilocalorie?
Yes. The “Calorie” with a capital C on food labels is a kilocalorie (1000 small calories). So 200 Calories on a label means 200 kcal, which is 836.8 kJ.
What’s 2000 calories in kJ?
8368 kJ. Since label Calories are kilocalories, 2000 of them equals 2000 kcal, and multiplying by 4.184 gives 8368 kilojoules.
What is 500 kcal in kJ?
2092 kJ. A 500 kcal meal, think a big burger or a hearty breakfast, reads as 2092 kilojoules on an Australian or EU label.
How many kJ is 100 kcal?
418.4 kJ. That’s the round snack-size number: a 100-Calorie pack is 418.4 kJ, handy for eyeballing portions against a kJ label.
Why convert kcal to kJ at all?
Because much of the world labels food energy in kilojoules. If your tracking is in calories but a product or a regional guideline is in kJ, converting lets you compare them directly.
Does this send my data anywhere?
Nope. It’s plain browser math with the factor built in, so your numbers stay local and it runs offline after the page has loaded.