Convert battery capacity between amp-hours, milliamp-hours, watt-hours, kilowatt-hours, volts, watts, and runtime. Use this converter for car batteries, EV batteries, lithium batteries, power stations, deep cycle batteries, and 12V systems.
Amp-hours to watt-hours:
Wh = Ah × volts
Watt-hours to amp-hours:
Ah = Wh ÷ volts
Milliamp-hours to amp-hours:
Ah = mAh ÷ 1000
Runtime estimate:
hours = usable Wh ÷ load watts
Battery capacity conversions are useful for car batteries, EV batteries, RV batteries, marine batteries, solar batteries, deep cycle batteries, portable power stations, lithium battery packs, inverters, and 12V accessories.
Use this converter as an estimate. Actual runtime depends on battery chemistry, temperature, discharge rate, inverter losses, battery age, and usable depth of discharge.
Your result shows the entered battery capacity converted into the selected unit. The converter also displays amp-hours, milliamp-hours, watt-hours, kilowatt-hours, usable energy, and estimated runtime based on the load entered.
Battery capacity ratings are not always fully usable. Lead-acid batteries, lithium batteries, EV packs, and power stations may have different usable capacity limits and efficiency losses.
Multiply amp-hours by voltage. For example, 100Ah at 12V equals 1200Wh.
Divide watt-hours by voltage. For example, 1200Wh at 12V equals 100Ah.
Divide milliamp-hours by 1000. For example, 5000mAh equals 5Ah.
Divide usable watt-hours by the load in watts. For example, 1200Wh powering 100W lasts about 12 hours before losses.
Wh is usually better when comparing batteries with different voltages because it measures stored energy.