Wh

Units & Measurements abbreviation · Engineering Unit

Wh
Stands forWatt-hour
CategoriesUnits & Measurements

Wh stands for Watt-hour, an engineering unit abbreviation.

Energy equal to one watt sustained for one hour, or 3,600 joules. Laptop, power bank and e-bike batteries are rated in Wh, a better measure of stored energy than mAh because it accounts for voltage.

Example: Airlines allow power banks up to 100 Wh in carry-on bags without approval.

Usage notes

FAA and IATA rules allow lithium batteries up to 100 Wh in carry-on luggage, those from 100 to 160 Wh with airline approval, and nothing larger in the passenger cabin; spare lithium batteries are banned from checked bags. To convert, multiply mAh by voltage and divide by 1,000: a 20,000 mAh bank at 3.7 V holds 74 Wh.

More engineering unit abbreviations

  • A – Ampere
  • AFUE – Annual Fuel Utilization Efficiency
  • Ah – Ampere-hour
  • atm – Standard atmosphere
  • AWG – American wire gauge
  • bar – Bar
  • bhp – Brake horsepower
  • BTU – British thermal unit
  • C – Degree Celsius
  • Cal – Food Calorie (kilocalorie)
  • cfm – Cubic feet per minute
  • Ci – Curie

See all 103 engineering unit abbreviations →

Edited by the AbbreviationList.com team. Spotted an error or a missing meaning? Contact us.