What is a watt-hour?

Definition

Wh

The watt-hour (Wh) is an energy unit equal to one watt of power used for one hour, equal to 3,600 joules.

Unit system

Electrical

Convert watt-hours

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

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