Battery capacity is quoted in two ways, and this calculator converts freely between them. Ampere hours measure charge, watt hours measure energy, and the two are linked by voltage: watt hours equal amp hours times the battery voltage. Enter any two of amp hours, watt hours and voltage and the tool fills in the third, so you can compare a phone bank rated in milliamp hours against a power station rated in watt hours, or work out the true energy in a 12 volt lead acid pack. This matters when you are sizing storage for solar, planning airline carry on limits that are stated in watt hours, or matching a battery to a load. It also shows the milliamp hour value for small cells. Enter your figures and read every equivalent instantly. Everything runs locally in your browser, so it is fast and private.
Battery capacity is quoted in two ways, and this calculator converts freely between them. Ampere hours measure charge, watt hours measure energy, and the two are linked by voltage: watt hours equal amp hours times the battery voltage.
Yes. Ampere Hour and Watt Hour Calculator is completely free, with no sign-up and no usage limits.
Yes. Ampere Hour and Watt Hour Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Ampere Hour and Watt Hour Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.