Kilojoule to Kilocalorie Converter
Energy · unit-converter
Convert Kilojoule to Kilocalorie with fixed input and output units, a step-by-step formula line, and reference tables. Factors are joule-based; food energy uses thermochemical calories. The full Energy Converter also includes MMBtu, toe, thermal kWh, and MeV/GeV.
Calculator
From: Kilojoule (kj)
To: Kilocalorie (kcal)
About Kilojoule
One kilojoule is 1,000 J. Scientific and engineering contexts often use kJ alongside joules.
About Kilocalorie
The kilocalorie (kcal) is 1,000 calories in the nutrition sense—often labeled “Calorie” on food packaging. Here 1 kcal = 4,184 J (thermochemical calorie definition used in this tool).
How to convert kilojoules to kilocalories
1 kilojoule is equal to 0.23900573613767 kilocalorie when both are expressed in joule-equivalents:
1 kj = (1,000 J ÷ 4,184 J) kcal = 0.23900573613767 kcal
Each kilojoule is defined as 1,000 J and each kilocalorie as 4,184 J in this tool, so one kj equals 1,000 ÷ 4,184 kcal = 0.23900573613767 kcal.
Let d(kj) be the numeric amount in Kilojoule (kj), and d(kcal) the amount in Kilocalorie (kcal). Then:
d(kcal) = d(kj) × (1,000 / 4,184)
Equivalently, divide by how many kj fit into one kcal (joules per kcal divided by joules per kj):
d(kcal) = d(kj) ÷ 4.184
Or: kilocalorie = kilojoule ÷ 4.184
Examples
Example #1: Convert 1 kj to kilocalorie
1 kj = 1 kj × (1,000/4,184) kcal = 0.2390057361 kcal
1 kj = 1 kj ÷ 4.184 = 0.2390057361 kcal
Example #2: Convert 10 kj to kilocalorie
10 kj = 10 kj × (1,000/4,184) kcal = 2.3900573614 kcal
10 kj = 10 kj ÷ 4.184 = 2.3900573614 kcal
Summary
To convert Kilojoule to Kilocalorie, multiply the value in kj by the ratio of joules per kj divided by joules per kcal. Equivalently: value_kcal = value_kj × (1000 / 4184). Numerically, 1 kj equals 0.2390057361376673 kcal.
Relationship context
You are converting between SI energy (joules) (Kilojoules) and food / nutrition energy (calories) (Kilocalories). All values are mapped through joules first. The numeric factor is 2.390057e-1.
Conversion tables
| Kilojoule (kj) | Kilocalorie (kcal) |
|---|---|
| 0.1 | 0.0239005736 |
| 1 | 0.2390057361 |
| 2 | 0.4780114723 |
| 3 | 0.7170172084 |
| 4 | 0.9560229446 |
| 5 | 1.1950286807 |
| 6 | 1.4340344168 |
| 7 | 1.673040153 |
| 8 | 1.9120458891 |
| 9 | 2.1510516252 |
| Kilojoule (kj) | Kilocalorie (kcal) |
|---|---|
| 10 | 2.3900573614 |
| 20 | 4.7801147227 |
| 30 | 7.1701720841 |
| 40 | 9.5602294455 |
| 50 | 11.9502868069 |
| 60 | 14.3403441683 |
| 70 | 16.7304015296 |
| 80 | 19.120458891 |
| 90 | 21.5105162524 |
| 100 | 23.9005736138 |