Calorie to Megajoule Converter
Energy · unit-converter
Convert Calorie to Megajoule 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: Megajoule (mj)
About Calorie
The small calorie (cal) is 4.184 J in this converter (thermochemical). Do not confuse with the dietary kilocalorie (kcal).
About Megajoule
One megajoule is 1,000,000 J. It is common in fuel-content and engineering thermal calculations.
How to convert calories to megajoules
1 calorie is equal to 0.000004184 megajoule when both are expressed in joule-equivalents:
1 cal = (4.184 J ÷ 1,000,000 J) mj = 0.000004184 mj
Each calorie is defined as 4.184 J and each megajoule as 1,000,000 J in this tool, so one cal equals 4.184 ÷ 1,000,000 mj = 0.000004184 mj.
Let d(cal) be the numeric amount in Calorie (cal), and d(mj) the amount in Megajoule (mj). Then:
d(mj) = d(cal) × (4.184 / 1,000,000)
Equivalently, divide by how many cal fit into one mj (joules per mj divided by joules per cal):
d(mj) = d(cal) ÷ 239005.7361376672925
Or: megajoule = calorie ÷ 239005.7361376672925
Examples
Example #1: Convert 1 cal to megajoule
1 cal = 1 cal × (4.184/1,000,000) mj = 0.000004184 mj
1 cal = 1 cal ÷ 239005.7361376672925 = 0.000004184 mj
Example #2: Convert 10 cal to megajoule
10 cal = 10 cal × (4.184/1,000,000) mj = 0.00004184 mj
10 cal = 10 cal ÷ 239005.7361376672925 = 0.00004184 mj
Summary
To convert Calorie to Megajoule, multiply the value in cal by the ratio of joules per cal divided by joules per mj. Equivalently: value_mj = value_cal × (4.184 / 1000000). Numerically, 1 cal equals 0.000004184 mj.
Relationship context
You are converting between food / nutrition energy (calories) (Calories) and SI energy (joules) (Megajoules). All values are mapped through joules first. The numeric factor is 4.184000e-6.
Conversion tables
| Calorie (cal) | Megajoule (mj) |
|---|---|
| 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 |
| Calorie (cal) | Megajoule (mj) |
|---|---|
| 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 |