Kilocalorie to Gigajoule Converter
Energy · unit-converter
Convert Kilocalorie 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: Kilocalorie (kcal)
To: Gigajoule (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).
About Gigajoule
One gigajoule is 1,000,000,000 J. Utility-scale and fuel-system reporting commonly use GJ.
How to convert kilocalories to gigajoules
1 kilocalorie is equal to 0.000004184 gigajoule when both are expressed in joule-equivalents:
1 kcal = (4,184 J ÷ 1,000,000,000 J) gj = 0.000004184 gj
Each kilocalorie is defined as 4,184 J and each gigajoule as 1,000,000,000 J in this tool, so one kcal equals 4,184 ÷ 1,000,000,000 gj = 0.000004184 gj.
Let d(kcal) be the numeric amount in Kilocalorie (kcal), and d(gj) the amount in Gigajoule (gj). Then:
d(gj) = d(kcal) × (4,184 / 1,000,000,000)
Equivalently, divide by how many kcal fit into one gj (joules per gj divided by joules per kcal):
d(gj) = d(kcal) ÷ 239005.7361376672925
Or: gigajoule = kilocalorie ÷ 239005.7361376672925
Examples
Example #1: Convert 1 kcal to gigajoule
1 kcal = 1 kcal × (4,184/1,000,000,000) gj = 0.000004184 gj
1 kcal = 1 kcal ÷ 239005.7361376672925 = 0.000004184 gj
Example #2: Convert 10 kcal to gigajoule
10 kcal = 10 kcal × (4,184/1,000,000,000) gj = 0.00004184 gj
10 kcal = 10 kcal ÷ 239005.7361376672925 = 0.00004184 gj
Summary
To convert Kilocalorie to Gigajoule, multiply the value in kcal by the ratio of joules per kcal divided by joules per gj. Equivalently: value_gj = value_kcal × (4184 / 1000000000). Numerically, 1 kcal equals 0.000004184 gj.
Relationship context
You are converting between food / nutrition energy (calories) (Kilocalories) and SI energy (joules) (Gigajoules). All values are mapped through joules first. The numeric factor is 4.184000e-6.
Conversion tables
| Kilocalorie (kcal) | Gigajoule (gj) |
|---|---|
| 0.1 | 0.0000004184 |
| 1 | 0.000004184 |
| 2 | 0.000008368 |
| 3 | 0.000012552 |
| 4 | 0.000016736 |
| 5 | 0.00002092 |
| 6 | 0.000025104 |
| 7 | 0.000029288 |
| 8 | 0.000033472 |
| 9 | 0.000037656 |
| Kilocalorie (kcal) | Gigajoule (gj) |
|---|---|
| 10 | 0.00004184 |
| 20 | 0.00008368 |
| 30 | 0.00012552 |
| 40 | 0.00016736 |
| 50 | 0.0002092 |
| 60 | 0.00025104 |
| 70 | 0.00029288 |
| 80 | 0.00033472 |
| 90 | 0.00037656 |
| 100 | 0.0004184 |