How many megajoules are in 1 calorie?

1 calorie equals 0.000004184 MJ.

How do I convert megajoules back to calories?

Use the reverse converter: 1 megajoule equals 239006 cal.

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert calories to megajoules, multiply the value by 0.000004184.

MJ = cal × 0.000004184

40 cal × 0.000004184 = 0.0001674 MJ

Calorie (cal): The thermochemical calorie is exactly 4.184 joules, historically the heat to warm one gram of water by 1 °C.
Megajoule (MJ): 1,000,000 joules; used for fuel and industrial energy.

How do I convert calories to megajoules?: To convert calories to megajoules, multiply the value by 0.000004184.
How many megajoules are in 1 calorie?: 1 calorie equals 0.000004184 MJ.
How many megajoules are in 10 calories?: 10 cal equals 0.00004184 MJ.
How do I convert megajoules back to calories?: Use the reverse converter: 1 megajoule equals 239006 cal.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.