Calories to Gigajoules Converter
Convert calories (thermochemical) (cal) to gigajoules (GJ), with the formula, a conversion table and exact factors.
Change the values and press Calculate to work out your own figures.
Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.
Show the working
- 1 cal = 4.184e-9 GJ
- 1 × 4.184e-9 = 4.184e-9 GJ
How to convert calories to gigajoules
1 cal = 4.184 × 10⁻⁹ GJ, so multiply by 4.184 to go from calories (thermochemical) to gigajoules. Going the other way, 1 GJ = 239,005,736.138 cal.
GJ = cal × 4.184 cal = GJ × 239,005,736.138
Worked example:
1 cal = 4.184e-9 GJ 5 × 4.184e-9 = 2.092e-8 GJ
Calories to gigajoules table
| Calories | Gigajoules |
|---|---|
| 1 cal | 4.184 × 10⁻⁹ GJ |
| 2 cal | 8.368 × 10⁻⁹ GJ |
| 3 cal | 1.2552 × 10⁻⁸ GJ |
| 4 cal | 1.6736 × 10⁻⁸ GJ |
| 5 cal | 2.092 × 10⁻⁸ GJ |
| 6 cal | 2.5104 × 10⁻⁸ GJ |
| 7 cal | 2.9288 × 10⁻⁸ GJ |
| 8 cal | 3.3472 × 10⁻⁸ GJ |
| 9 cal | 3.7656 × 10⁻⁸ GJ |
| 10 cal | 4.184 × 10⁻⁸ GJ |
| 15 cal | 6.276 × 10⁻⁸ GJ |
| 20 cal | 8.368 × 10⁻⁸ GJ |
| 25 cal | 1.046 × 10⁻⁷ GJ |
| 30 cal | 1.2552 × 10⁻⁷ GJ |
| 40 cal | 1.6736 × 10⁻⁷ GJ |
| 50 cal | 2.092 × 10⁻⁷ GJ |
| 75 cal | 3.138 × 10⁻⁷ GJ |
| 100 cal | 4.184 × 10⁻⁷ GJ |
| 250 cal | 1.046 × 10⁻⁶ GJ |
| 500 cal | 2.092 × 10⁻⁶ GJ |
| 1000 cal | 4.184 × 10⁻⁶ GJ |
About the units
- Calories (cal)
- Calories (thermochemical), a specialised unit. The thermochemical calorie, 4.184 J, used on US food labels as 1 Calorie = 1 kilocalorie. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.
- Gigajoules (GJ)
- Gigajoules, a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).
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