Calories to Megajoules Converter

Convert calories (thermochemical) (cal) to megajoules (MJ), 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.

Value

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.

The unit you want the answer in. Swap exchanges the two units.

Result

Result: 4.184 × 10⁻⁶ MJ
joules (watt-seconds): 4.184 J
kilojoules: 0.004184 kJ
gigajoules: 4.184 × 10⁻⁹ GJ
kilocalories (food Calories): 0.001 kcal
megacalories: 1 × 10⁻⁶ Mcal
watt-hours: 0.00116222222222 Wh
kilowatt-hours: 1.16222222222 × 10⁻⁶ kWh
megawatt-hours: 1.16222222222 × 10⁻⁹ MWh
British thermal units (IT): 0.00396566683139 Btu
million Btu: 3.96566683139 × 10⁻⁹ MMBtu
therms (100,000 Btu): 3.96566683139 × 10⁻⁸ thm
quads (10¹⁵ Btu): 3.96566683139 × 10⁻¹⁸ quad
electronvolts: 2.61144739675 × 10¹⁹ eV
kiloelectronvolts: 2.61144739675 × 10¹⁶ keV
megaelectronvolts: 26,114,473,967,500 MeV

1 cal = 4.184 × 10⁻⁶ MJ

Show the working

1 cal = 4.184e-6 MJ
1 × 4.184e-6 = 4.184e-6 MJ

How to convert calories to megajoules

1 cal = 4.184 × 10⁻⁶ MJ, so multiply by 4.184 to go from calories (thermochemical) to megajoules. Going the other way, 1 MJ = 239,005.736138 cal.

MJ = cal × 4.184
cal = MJ × 239,005.736138

Worked example:

1 cal = 4.184e-6 MJ
5 × 4.184e-6 = 2.092e-5 MJ

Calories to megajoules table

Calories	Megajoules
1 cal	4.184 × 10⁻⁶ MJ
2 cal	8.368 × 10⁻⁶ MJ
3 cal	1.2552 × 10⁻⁵ MJ
4 cal	1.6736 × 10⁻⁵ MJ
5 cal	2.092 × 10⁻⁵ MJ
6 cal	2.5104 × 10⁻⁵ MJ
7 cal	2.9288 × 10⁻⁵ MJ
8 cal	3.3472 × 10⁻⁵ MJ
9 cal	3.7656 × 10⁻⁵ MJ
10 cal	4.184 × 10⁻⁵ MJ
15 cal	6.276 × 10⁻⁵ MJ
20 cal	8.368 × 10⁻⁵ MJ
25 cal	0.0001046 MJ
30 cal	0.00012552 MJ
40 cal	0.00016736 MJ
50 cal	0.0002092 MJ
75 cal	0.0003138 MJ
100 cal	0.0004184 MJ
250 cal	0.001046 MJ
500 cal	0.002092 MJ
1000 cal	0.004184 MJ

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.
Megajoules (MJ): Megajoules, a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).

Formula version 0.1.0Reviewed

Calories to Megajoules Converter

How to convert calories to megajoules

Calories to megajoules table

About the units

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