Converter

Ah to Wh converter

Watt-hours = amp-hours × volts. A 12 V, 100 Ah battery holds 1,200 Wh; a 20,000 mAh power bank at 3.7 V holds 74 Wh.

Wh = Ah × V · Wh = mAh × V ÷ 1,000

Common batteries in Wh

Battery	Capacity	Volts	Watt-hours	100 W load
Power bank, 20,000 mAh	20,000 mAh	3.7 V	74 Wh	38 min
Power bank, 10,000 mAh	10,000 mAh	3.7 V	37 Wh	19 min
12 V battery, 100 Ah	100 Ah	12 V	1,200 Wh	10.2 h
LiFePO4 battery, 12.8 V, 100 Ah	100 Ah	12.8 V	1,280 Wh	10.9 h
24 V battery, 100 Ah	100 Ah	24 V	2,400 Wh	20.4 h
Server-rack battery, 51.2 V, 100 Ah	100 Ah	51.2 V	5,120 Wh	43.5 h

The last column: how long a power station holding that many Wh would run 100 W, by our formula (Wh × 0.85 ÷ watts).

Why power stations list Wh

Amp-hours only mean something at a given voltage, so a 100 Ah battery holds 1,200 Wh at 12 V but 5,120 Wh at 51.2 V. Watt-hours already include the voltage, which is why every station here is rated in Wh: from 286 Wh (EcoFlow RIVER 3 Plus) to 5,024 Wh (Anker SOLIX S5000).

To see how long that runs your devices, use the calculator or the runtime table.

Quick answers

How many Wh is 100 Ah?

It depends on the voltage: 1,200 Wh at 12 V, 1,280 Wh at 12.8 V and 2,400 Wh at 24 V. Wh = Ah × volts.

How do I convert mAh to Wh?

Multiply mAh by the volts and divide by 1,000. A 20,000 mAh power bank at 3.7 V holds 20,000 × 3.7 ÷ 1,000 = 74 Wh.

How do I convert Wh to Ah?

Divide by the volts: a 1,000 Wh battery at 12 V is about 83 Ah. Power stations list Wh, so you rarely need this.