Watt Hours to Amp Hours (Wh to Ah) Conversion Calculator

Use our interactive calculator to easily convert watt hours to amp hours (Wh to Ah).

Watt Hours to Amp Hours Conversion Calculator

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amp hours (Ah)
Conversion formula: Ah = Wh ÷ V

Or would you rather convert amp hours to watt hours?

Watt Hours to Amp Hours Conversion Charts

Here are conversion charts converting watt hours to amp hours at common DC voltages.

Watt Hours to Amp Hours at 12V

Watt hours (Wh)Voltage (V)Amp hours (Ah)
100 Wh12 V8.33 Ah
200 Wh12 V16.67 Ah
300 Wh12 V25 Ah
400 Wh12 V33.33 Ah
500 Wh12 V41.67 Ah
600 Wh12 V50 Ah
700 Wh12 V58.33 Ah
720 Wh12 V60 Ah
800 Wh12 V66.67 Ah
900 Wh12 V75 Ah
960 Wh12 V80 Ah
1000 Wh12 V83.33 Ah
1100 Wh12 V91.67 Ah
1200 Wh12 V100 Ah
1260 Wh12 V105 Ah
1300 Wh12 V108.33 Ah
1400 Wh12 V116.67 Ah
1500 Wh12 V125 Ah
2000 Wh12 V166.67 Ah
2400 Wh12 V200 Ah
3000 Wh12 V250 Ah
3600 Wh12 V300 Ah
4000 Wh12 V333.33 Ah
5000 Wh12 V416.67 Ah
6000 Wh12 V500 Ah
7000 Wh12 V583.33 Ah
8000 Wh12 V666.67 Ah
8700 Wh12 V725 Ah
9000 Wh12 V750 Ah
9600 Wh12 V800 Ah

Watt Hours to Amp Hours at 24V

Watt hours (Wh)Voltage (V)Amp hours (Ah)
100 Wh24 V4.17 Ah
200 Wh24 V8.33 Ah
300 Wh24 V12.5 Ah
400 Wh24 V16.67 Ah
500 Wh24 V20.83 Ah
600 Wh24 V25 Ah
700 Wh24 V29.17 Ah
720 Wh24 V30 Ah
800 Wh24 V33.33 Ah
900 Wh24 V37.5 Ah
960 Wh24 V40 Ah
1000 Wh24 V41.67 Ah
1100 Wh24 V45.83 Ah
1200 Wh24 V50 Ah
1260 Wh24 V52.5 Ah
1300 Wh24 V54.17 Ah
1400 Wh24 V58.33 Ah
1500 Wh24 V62.5 Ah
2000 Wh24 V83.33 Ah
2400 Wh24 V100 Ah
3000 Wh24 V125 Ah
3600 Wh24 V150 Ah
4000 Wh24 V166.67 Ah
5000 Wh24 V208.33 Ah
6000 Wh24 V250 Ah
7000 Wh24 V291.67 Ah
8000 Wh24 V333.33 Ah
8700 Wh24 V362.5 Ah
9000 Wh24 V375 Ah
9600 Wh24 V400 Ah

Watt Hours to Amp Hours at 36V

Watt hours (Wh)Voltage (V)Amp hours (Ah)
100 Wh36 V2.78 Ah
200 Wh36 V5.56 Ah
300 Wh36 V8.33 Ah
400 Wh36 V11.11 Ah
500 Wh36 V13.89 Ah
600 Wh36 V16.67 Ah
700 Wh36 V19.44 Ah
720 Wh36 V20 Ah
800 Wh36 V22.22 Ah
900 Wh36 V25 Ah
960 Wh36 V26.67 Ah
1000 Wh36 V27.78 Ah
1100 Wh36 V30.56 Ah
1200 Wh36 V33.33 Ah
1260 Wh36 V35 Ah
1300 Wh36 V36.11 Ah
1400 Wh36 V38.89 Ah
1500 Wh36 V41.67 Ah
2000 Wh36 V55.56 Ah
2400 Wh36 V66.67 Ah
3000 Wh36 V83.33 Ah
3600 Wh36 V100 Ah
4000 Wh36 V111.11 Ah
5000 Wh36 V138.89 Ah
6000 Wh36 V166.67 Ah
7000 Wh36 V194.44 Ah
8000 Wh36 V222.22 Ah
8700 Wh36 V241.67 Ah
9000 Wh36 V250 Ah
9600 Wh36 V266.67 Ah

Watt Hours to Amp Hours at 48V

Watt hours (Wh)Voltage (V)Amp hours (Ah)
100 Wh48 V2.08 Ah
200 Wh48 V4.17 Ah
300 Wh48 V6.25 Ah
400 Wh48 V8.33 Ah
500 Wh48 V10.42 Ah
600 Wh48 V12.5 Ah
700 Wh48 V14.58 Ah
720 Wh48 V15 Ah
800 Wh48 V16.67 Ah
900 Wh48 V18.75 Ah
960 Wh48 V20 Ah
1000 Wh48 V20.83 Ah
1100 Wh48 V22.92 Ah
1200 Wh48 V25 Ah
1260 Wh48 V26.25 Ah
1300 Wh48 V27.08 Ah
1400 Wh48 V29.17 Ah
1500 Wh48 V31.25 Ah
2000 Wh48 V41.67 Ah
2400 Wh48 V50 Ah
3000 Wh48 V62.5 Ah
3600 Wh48 V75 Ah
4000 Wh48 V83.33 Ah
5000 Wh48 V104.17 Ah
6000 Wh48 V125 Ah
7000 Wh48 V145.83 Ah
8000 Wh48 V166.67 Ah
8700 Wh48 V181.25 Ah
9000 Wh48 V187.5 Ah
9600 Wh48 V200 Ah

How to Convert Watt Hours to Amp Hours (Wh to Ah)

To convert watt hours to amp hours, simply divide watt hours by volts.

Formula: amp hours = watt hours ÷ volts

Abbreviated: Ah = Wh ÷ V

Example

Let's say you have a 2000Wh LiFePO4 battery. You know it's a 12 volt battery, and you want to calculate its amp hours.

To do so, you'd divide watt hours by volts:

2000Wh ÷ 12V = 166.67Ah

In this example, your battery has a 166.67Ah capacity.

Note: Most people use a battery's nominal voltage when calculating amp hours or watt hours, but it's worth reminding you that a battery's actual voltage is slightly different and varies based on its remaining capacity. For instance, a 12V LiFePO4 battery actually has a voltage of 13.6V when fully charged.

Why Convert Watt Hours to Amp Hours?

Some brands have started reporting their batteries' capacities in watt hours -- particularly for solar generators (aka portable power stations).

This is helpful for making an apples to apples comparison of the energy these batteries can deliver.

But, it can be helpful to convert watt hours to amp hours when designing a solar electrical system. After all, things like wire gauge, fuse size, and max charge and discharge rates depend on amperage, not wattage.

Why convert watt hours to amp hours? One reason is because it can help you figure out the max charge rate of your battery, so you can design a solar power system that doesn't go over that limit.

For example:

The LiFePO4 battery in the example above had a 166.67Ah capacity. This is important to know because many LiFePO4 batteries have a maximum recommended charge rate of 50% of battery capacity in amp hours.

This means our battery's max charge rate is around 83.33 amps, and we can design our solar power system so we don't exceed that limit.

How to Convert Amp Hours to Watt Hours (Ah to Wh)

To convert amp hours to watt hours, you just multiply amp hours by volts.

Formula: watt hours = amp hours × volts

Abbreviated: Wh = Ah × V

Example

Let's say you have a 100Ah 12V car battery.

To calculate your battery's watt hours, you'd multiply 100Ah × 12V.

100Ah × 12V = 1200Wh

In this example, your car battery has a capacity of 1200 watt hours.

How to Convert Kilowatt Hours to Amp Hours (kWh to Ah)

1 kilowatt hour is equal to 1000 watt hours. (Just like how 1 kilometer is 1000 meters.)

So, to convert kilowatt hours to amp hours, you multiply kilowatt hours by 1000 and then divide by volts.

Formula: amp hours = kilowatt hours × 1000 ÷ volts

Abbreviated: Ah = kWh × 1000 ÷ V

Calculator: Kilowatt Hours to Amp Hours Calculator

Example

Let's say your buddy tells you he built a 3.5kWh 24V solar generator. Impressive! You wonder: How many amp hours is his generator's battery?

To find out, you'd do the following calculation:

3.5kWh × 1000 ÷ 24V = 145.83Ah

Turns out his generator's battery has a capacity of around 145Ah. Time for you to build one with a 150Ah capacity. 😉

How to Convert Watt Hours to Milliamp Hours (Wh to mAh)

1 amp hour is equal to 1000 milliamp hours. (Just like how 1 meter is 1000 millimeters.)

So, to convert watt hours to milliamp hours, you multiply watt hours by 1000 and then divide by volts.

Formula: milliamp hours = watt hours × 1000 ÷ volts

Abbreviated: mAh = Wh × 1000 ÷ V

Example

Let's say you're interested in buying a new phone with a 12.4 watt hour battery. You know it's a 3.7 volt lithium ion battery and you want to find out how many milliamp hours it is.

To calculate its capacity in milliamp hours, you'd do the following:

12.4Wh × 1000 ÷ 3.7V = 3351.35mAh

The phone battery has a capacity of around 3351mAh.

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Alex Beale
Alex Beale
Hi, I'm Alex. I’m a DIY solar power enthusiast on a journey to learn how to solar power anything. Footprint Hero is where I’m sharing what I learn – as well as the (many) mistakes I’m making along the way.