Kilocalorie to Kilojoule (kcal to kJ)
Result
4.184 Kilojoule
Formula
kJ = kcal × 4.184
1 kcal = 4.184 kJ, and 1 kJ = 0.2390057361 kcal.
The joule is the SI unit of energy. The calorie used here is the thermochemical calorie, exactly 4.184 J; a kilowatt-hour is exactly 3.6 MJ; the BTU is the International Table BTU (1,055.05585262 J).
Worked examples
- 1 kcal × 4.184 = 4.184 kJ
- 100 kcal × 4.184 = 418.4 kJ
- 2,000 kcal × 4.184 = 8,368 kJ
- 2,500 kcal × 4.184 = 10,460 kJ
Things to know about kcal to kJ
- One kilocalorie (food Calorie) is exactly 4.184 kJ.
- A 2,000 kcal daily reference intake is 8,368 kJ.
Kilocalorie to Kilojoule table
| Kilocalorie (kcal) | Kilojoule (kJ) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 50 | 209.2 |
| 100 | 418.4 |
| 1,000 | 4,184 |
| 2,000 | 8,368 |
| 2,500 | 10,460 |
The units
- Kilocalorie (kcal)
- Kilocalorie (thermochemical): exactly 4,184 J. The "Calorie" on food labels.
- Kilojoule (kJ)
- Kilojoule: 1,000 joules. Food labels in Australia, New Zealand and the EU show kJ.
Sources for these factors
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
- The International System of Units (SI Brochure), 9th edition — BIPM
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy