Calorie to Gigajoule Converter
Energy · unit-converter
Convert Calorie to Gigajoule 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: Calorie (cal)
To: Gigajoule (gj)
About Calorie
The small calorie (cal) is 4.184 J in this converter (thermochemical). Do not confuse with the dietary kilocalorie (kcal).
About Gigajoule
One gigajoule is 1,000,000,000 J. Utility-scale and fuel-system reporting commonly use GJ.
How to convert calories to gigajoules
1 calorie is equal to 4.18400000e-9 gigajoule when both are expressed in joule-equivalents:
1 cal = (4.184 J ÷ 1,000,000,000 J) gj = 4.18400000e-9 gj
Each calorie is defined as 4.184 J and each gigajoule as 1,000,000,000 J in this tool, so one cal equals 4.184 ÷ 1,000,000,000 gj = 4.18400000e-9 gj.
Let d(cal) be the numeric amount in Calorie (cal), and d(gj) the amount in Gigajoule (gj). Then:
d(gj) = d(cal) × (4.184 / 1,000,000,000)
Equivalently, divide by how many cal fit into one gj (joules per gj divided by joules per cal):
d(gj) = d(cal) ÷ 2.39005736e+8
Or: gigajoule = calorie ÷ 2.39005736e+8
Examples
Example #1: Convert 1 cal to gigajoule
1 cal = 1 cal × (4.184/1,000,000,000) gj = 0.0000000042 gj
1 cal = 1 cal ÷ 2.39005736e+8 = 0.0000000042 gj
Example #2: Convert 10 cal to gigajoule
10 cal = 10 cal × (4.184/1,000,000,000) gj = 0.0000000418 gj
10 cal = 10 cal ÷ 2.39005736e+8 = 0.0000000418 gj
Summary
To convert Calorie to Gigajoule, multiply the value in cal by the ratio of joules per cal divided by joules per gj. Equivalently: value_gj = value_cal × (4.184 / 1000000000). Numerically, 1 cal equals 4.1840000000000004e-9 gj.
Relationship context
You are converting between food / nutrition energy (calories) (Calories) and SI energy (joules) (Gigajoules). All values are mapped through joules first. The numeric factor is 4.184000e-9.
Conversion tables
| Calorie (cal) | Gigajoule (gj) |
|---|---|
| 0.1 | 0.0000000004 |
| 1 | 0.0000000042 |
| 2 | 0.0000000084 |
| 3 | 0.0000000126 |
| 4 | 0.0000000167 |
| 5 | 0.0000000209 |
| 6 | 0.0000000251 |
| 7 | 0.0000000293 |
| 8 | 0.0000000335 |
| 9 | 0.0000000377 |
| Calorie (cal) | Gigajoule (gj) |
|---|---|
| 10 | 0.0000000418 |
| 20 | 0.0000000837 |
| 30 | 0.0000001255 |
| 40 | 0.0000001674 |
| 50 | 0.0000002092 |
| 60 | 0.000000251 |
| 70 | 0.0000002929 |
| 80 | 0.0000003347 |
| 90 | 0.0000003766 |
| 100 | 0.0000004184 |