Joule to Kilocalorie Converter
Energy · unit-converter
Convert Joule 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: Joule (j)
To: Kilocalorie (kcal)
About Joule
The joule is the SI unit of energy. All other units here are converted through fixed joule equivalents.
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 joules to kilocalories
1 joule is equal to 0.00023900573614 kilocalorie when both are expressed in joule-equivalents:
1 j = (1 J ÷ 4,184 J) kcal = 0.00023900573614 kcal
Each joule is defined as 1 J and each kilocalorie as 4,184 J in this tool, so one j equals 1 ÷ 4,184 kcal = 0.00023900573614 kcal.
Let d(j) be the numeric amount in Joule (j), and d(kcal) the amount in Kilocalorie (kcal). Then:
d(kcal) = d(j) × (1 / 4,184)
Equivalently, divide by how many j fit into one kcal (joules per kcal divided by joules per j):
d(kcal) = d(j) ÷ 4184
Or: kilocalorie = joule ÷ 4184
Examples
Example #1: Convert 1 j to kilocalorie
1 j = 1 j × (1/4,184) kcal = 0.0002390057 kcal
1 j = 1 j ÷ 4184 = 0.0002390057 kcal
Example #2: Convert 10 j to kilocalorie
10 j = 10 j × (1/4,184) kcal = 0.0023900574 kcal
10 j = 10 j ÷ 4184 = 0.0023900574 kcal
Summary
To convert Joule to Kilocalorie, multiply the value in j by the ratio of joules per j divided by joules per kcal. Equivalently: value_kcal = value_j × (1 / 4184). Numerically, 1 j equals 0.0002390057361376673 kcal.
Relationship context
You are converting between SI energy (joules) (Joules) and food / nutrition energy (calories) (Kilocalories). All values are mapped through joules first. The numeric factor is 2.390057e-4.
Conversion tables
| Joule (j) | Kilocalorie (kcal) |
|---|---|
| 0.1 | 0.0000239006 |
| 1 | 0.0002390057 |
| 2 | 0.0004780115 |
| 3 | 0.0007170172 |
| 4 | 0.0009560229 |
| 5 | 0.0011950287 |
| 6 | 0.0014340344 |
| 7 | 0.0016730402 |
| 8 | 0.0019120459 |
| 9 | 0.0021510516 |
| Joule (j) | Kilocalorie (kcal) |
|---|---|
| 10 | 0.0023900574 |
| 20 | 0.0047801147 |
| 30 | 0.0071701721 |
| 40 | 0.0095602294 |
| 50 | 0.0119502868 |
| 60 | 0.0143403442 |
| 70 | 0.0167304015 |
| 80 | 0.0191204589 |
| 90 | 0.0215105163 |
| 100 | 0.0239005736 |