What is a megajoule?

Definition

MJ

The megajoule (MJ) equals 1,000,000 joules, used in energy production and large-scale engineering.

Unit system

SI / Metric

Convert megajoules

Joules → Megajoules Kilojoules → Megajoules Megajoules → Joules Megajoules → Kilojoules Megajoules → Calories Megajoules → Kilocalories Megajoules → Watt-hours Megajoules → Kilowatt-hours

All energy units

Unit	Symbol	System
joules	J	SI / Metric
kilojoules	kJ	SI / Metric
megajoules	MJ	SI / Metric
calories	cal	Heat & Food
kilocalories	kcal	Heat & Food
watt-hours	Wh	Electrical
kilowatt-hours	kWh	Electrical
megawatt-hours	MWh	Electrical
BTU	BTU	Imperial
electronvolts	eV	Scientific
foot-pounds	ft·lb	Imperial
ergs	erg	Scientific