Gigajoule to Kilocalorie Converter
Energy · unit-converter
Convert Gigajoule 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: Gigajoule (gj)
To: Kilocalorie (kcal)
About Gigajoule
One gigajoule is 1,000,000,000 J. Utility-scale and fuel-system reporting commonly use GJ.
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 gigajoules to kilocalories
1 gigajoule is equal to 239005.7361376672925 kilocalorie when both are expressed in joule-equivalents:
1 gj = (1,000,000,000 J ÷ 4,184 J) kcal = 239005.7361376672925 kcal
Each gigajoule is defined as 1,000,000,000 J and each kilocalorie as 4,184 J in this tool, so one gj equals 1,000,000,000 ÷ 4,184 kcal = 239005.7361376672925 kcal.
Let d(gj) be the numeric amount in Gigajoule (gj), and d(kcal) the amount in Kilocalorie (kcal). Then:
d(kcal) = d(gj) × (1,000,000,000 / 4,184)
Equivalently, divide by how many gj fit into one kcal (joules per kcal divided by joules per gj):
d(kcal) = d(gj) ÷ 0.000004184
Or: kilocalorie = gigajoule ÷ 0.000004184
Examples
Example #1: Convert 1 gj to kilocalorie
1 gj = 1 gj × (1,000,000,000/4,184) kcal = 239005.736138 kcal
1 gj = 1 gj ÷ 0.000004184 = 239005.736138 kcal
Example #2: Convert 10 gj to kilocalorie
10 gj = 10 gj × (1,000,000,000/4,184) kcal = 2390057.3613800001 kcal
10 gj = 10 gj ÷ 0.000004184 = 2390057.3613800001 kcal
Summary
To convert Gigajoule to Kilocalorie, multiply the value in gj by the ratio of joules per gj divided by joules per kcal. Equivalently: value_kcal = value_gj × (1000000000 / 4184). Numerically, 1 gj equals 239005.7361376673 kcal.
Relationship context
You are converting between SI energy (joules) (Gigajoules) and food / nutrition energy (calories) (Kilocalories). All values are mapped through joules first. The numeric factor is 2.390057e+5.
Conversion tables
| Gigajoule (gj) | Kilocalorie (kcal) |
|---|---|
| 0.1 | 23,900.5736138 |
| 1 | 239,005.736138 |
| 2 | 478,011.472275 |
| 3 | 717,017.208413 |
| 4 | 956,022.944551 |
| 5 | 1,195,028.6806900001 |
| 6 | 1,434,034.41683 |
| 7 | 1,673,040.1529600001 |
| 8 | 1,912,045.8891 |
| 9 | 2,151,051.62524 |
| Gigajoule (gj) | Kilocalorie (kcal) |
|---|---|
| 10 | 2,390,057.3613800001 |
| 20 | 4,780,114.7227499997 |
| 30 | 7,170,172.0841300003 |
| 40 | 9,560,229.44551 |
| 50 | 11,950,286.8069000002 |
| 60 | 14,340,344.1682999991 |
| 70 | 16,730,401.5296 |
| 80 | 19,120,458.8909999989 |
| 90 | 21,510,516.2523999996 |
| 100 | 23,900,573.6138000004 |