Watt-hours to Joules Converter (Wh to J)

Watt-hour to Joule Conversion Chart

Watt-hour (Wh)	Joule (J)	Reference Benchmark	Formula Step
0.1 Wh	360 J	Ten-Watt Smartphone Screen Active for Thirty-Six Seconds	0.1 × 3600 = 360 J
0.5 Wh	1800 J	Half Watt-Hour Standard Micro-Battery Charge Capacity	0.5 × 3600 = 1800 J
1 Wh	3600 J	Exact International Definition of One Watt-Hour Energy	1 × 3600 = 3600 J
2 Wh	7200 J	Two Watt-Hours Energy Consumed by Modern LED Night Light Overnight	2 × 3600 = 7200 J
5 Wh	18000 J	Energy Consumed by Fast Smartphone Charger in Twenty Minutes	5 × 3600 = 18000 J
10 Wh	36000 J	Standard Ten Watt-Hour Smartphone Internal Lithium Battery	10 × 3600 = 36000 J
20 Wh	72000 J	Twenty Watt-Hour High-Capacity Tablet Battery Rating Tier	20 × 3600 = 72000 J
50 Wh	180000 J	Fifty Watt-Hour Laptop Computer Battery Pack Standard	50 × 3600 = 180000 J
65 Wh	234000 J	Sixty-Five Watt-Hour Professional Ultrabook Battery Capacity	65 × 3600 = 234000 J
100 Wh	360000 J	FAA Flight Carry-On Maximum Allowed Power Bank Capacity	100 × 3600 = 360000 J
250 Wh	900000 J	Electric Bicycle High-Efficiency Commuter Battery Pack	250 × 3600 = 900000 J
500 Wh	1800000 J	Portable Outdoor Power Station Solar Generator Battery	500 × 3600 = 1800000 J
1000 Wh	3600000 J	One Kilowatt-Hour Electric Utility Grid Billing Benchmark	1000 × 3600 = 3600000 J
2000 Wh	7200000 J	Residential Emergency Home Backup Battery Storage Module	2000 × 3600 = 7200000 J
5000 Wh	18000000 J	Commercial Electric Cargo Van Auxiliary Auxiliary Battery Tier	5000 × 3600 = 18000000 J

Source Unit

Exact 3,600 Multiplier: One watt-hour equals exactly 3,600 joules (1 Wh = 3,600 J). To convert watt-hours to joules, multiply by 3,600.
Electrical Work Formulation: Since 1 watt = 1 joule per second, operating a 1-watt load for 1 hour (3,600 seconds) uses exactly 3,600 joules.

Target Unit

Electrical Work Formulation: Since 1 watt = 1 joule per second, operating a 1-watt load for 1 hour (3,600 seconds) uses exactly 3,600 joules.
Electronics Design: Engineers designing power supplies and battery chargers calculate energy in watt-hours for thermal dissipation and joules for component surge ratings.

There are exactly 3,600 joules in one watt-hour (1 Wh = 3,600 J).

To convert back, use the Joules to Watt-hours Converter where 1 J equals 1/3,600 Wh (~0.000278 Wh).

1 kWh equals 1,000 Wh, which corresponds to exactly 3,600,000 joules (3.6 MJ).

Watt-hours align naturally with electrical circuit ratings (volts × amps = watts). A 10 Wh battery powering a 2 W device runs for 5 hours.

Multiply by 3.6 to get kilojoules (kJ), then multiply by 1,000 (e.g. 10 Wh × 3.6 = 36 kJ = 36,000 J).