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

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

Amp Hours to Watt Hours Conversion Calculator

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watt hours (Wh)
Conversion formula: Wh = Ah × V

Or would you rather convert watt hours to amp hours?

Amp Hours to Watt Hours Conversion Charts

Here's are some tables converting amp hours to watt hours at common DC voltages.

Amp Hours to Watt Hours at 12V

Amp Hours (Ah)Voltage (V)Watt Hours (Wh)
1 Ah (1000 mAh)12 V12 Wh
2.5 Ah12 V30 Wh
5 Ah12 V60 Wh
6 Ah12 V72 Wh
7.2 Ah12 V86.4 Wh
7.5 Ah12 V90 Wh
10 Ah12 V120 Wh
50 Ah12 V600 Wh
65 Ah12 V780 Wh
100 Ah12 V1200 Wh
200 Ah12 V2400 Wh
300 Ah12 V3600 Wh
400 Ah12 V4800 Wh
500 Ah12 V6000 Wh
600 Ah12 V7200 Wh

Amp Hours to Watt Hours at 24V

Amp Hours (Ah)Voltage (V)Watt Hours (Wh)
1 Ah (1000 mAh)24 V24 Wh
2.5 Ah24 V60 Wh
5 Ah24 V120 Wh
7.5 Ah24 V180 Wh
10 Ah24 V240 Wh
50 Ah24 V1200 Wh
65 Ah24 V1560 Wh
100 Ah24 V2400 Wh
200 Ah24 V4800 Wh
300 Ah24 V7200 Wh
400 Ah24 V9600 Wh
500 Ah24 V12,000 Wh
600 Ah24 V14,400 Wh

Amp Hours to Watt Hours at 36V

Amp Hours (Ah)Voltage (V)Watt Hours (Wh)
1 Ah (1000 mAh)36 V36 Wh
2.5 Ah36 V90 Wh
5 Ah36 V180 Wh
7.5 Ah36 V270 Wh
10 Ah36 V360 Wh
50 Ah36 V1800 Wh
65 Ah36 V2340 Wh
100 Ah36 V3600 Wh
200 Ah36 V7200 Wh
300 Ah36 V10,800 Wh
400 Ah36 V14,400 Wh
500 Ah36 V18,000 Wh
600 Ah36 V21,600 Wh

Amp Hours to Watt Hours at 48V

Amp Hours (Ah)Voltage (V)Watt Hours (Wh)
1 Ah (1000 mAh)48 V48 Wh
2.5 Ah48 V120 Wh
5 Ah48 V240 Wh
7.5 Ah48 V360 Wh
10 Ah48 V480 Wh
50 Ah48 V2400 Wh
65 Ah48 V3120 Wh
100 Ah48 V4800 Wh
200 Ah48 V9600 Wh
300 Ah48 V14,400 Wh
400 Ah48 V19,200 Wh
500 Ah48 V24,000 Wh
600 Ah48 V28,800 Wh

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

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

Formula: watt hours = amp hours × volts

Abbreviated: Wh = Ah × V

Example

Let's say you have a 12V battery with a 50Ah capacity.

To calculate your battery's watt hours, you'd multiply its amp hours by its voltage:

50 Ah × 12 V = 600 Wh

In this example, your battery has a capacity of 600 watt hours.

Easy!

Why Convert Amp Hours to Watt Hours?

Converting amp hours to watt hours makes it easier to compare how much energy different batteries can deliver.

The total energy a battery can provide depends on both its amp hours and voltage, so only comparing amp hours can lead you to some erroneous conclusions.

For example, consider these two batteries of mine, which I'll call Battery A and Battery B:

Battery A (left) is a 36V 12.8Ah ebike battery, while Battery B is a 12V 33Ah lead acid battery. If you were to only compare their amp hours, you'd assume Battery B has a greater capacity.

Battery A is a 36V 12.8Ah ebike battery, while Battery B is a 12V 33Ah lead acid battery.

If you only looked at amp hours, you'd assume Battery B can provide a lot more energy.

After all, 33Ah is much greater than 12.8Ah.

But these batteries have different voltages, so only comparing their amp hours is like comparing apples to oranges. We need to take voltage into account for both batteries, and we do that by calculating their watt hours.

Once we do, we can make an apples to apples comparison of the amount of energy they can provide. And when we do, we see how wrong we were:

However, when we calculate each battery's capacity in watt hours, we find that Battery A actually has a greater capacity than Battery B.

That's right, Battery A actually has a greater capacity in watt hours than Battery B.

Why is this the case?

Electricity can be thought of like water flowing through a pipe. Voltage is like the water pressure, while amperage is like the flow rate.

Although Battery B can output its electrons at a higher 'flow rate', they flow at a lower 'pressure'.

On the other hand, Battery A can output its electrons at a lower flow rate, but they flow at three times the pressure. The extra pressure more than makes up for the smaller flow rate, meaning that Battery A ends up delivering more energy.

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

There are some types of batteries, such as solar generators, that by convention tend to describe their capacity in watt hours.

For instance, let's say you own the Jackery Explorer 1500, a solar generator with a 1534Wh capacity.

To calculate your generator's amp hours, you first need to find its battery voltage. You look online and see that the Explorer 1500 has a 25.2V battery.

With these two numbers, you can find your generator's amp hours by dividing its watt hours by its voltage:

1534Wh ÷ 25.2V = 60.9Ah

In this example, your solar generator has a capacity of 60.9Ah.

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

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

So, to convert amp hours to kilowatt hours, you first convert the amp hours to watt hours and then divide by 1000.

Formula: kilowatt hours = amp hours × volts ÷ 1000

Abbreviated: kWh = Ah × V ÷ 1000

Calculator: Amp Hours to Kilowatt Hours Calculator

Example

Let's say you own a 12V 100Ah lithium battery. To convert its amp hours to kilowatt hours, you'd do the following:

12V × 100Ah ÷ 1000 = 1.2kWh

Your lithium battery has a 1.2kWh capacity. That's some serious power!

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

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

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

Formula: watt hours = milliamp hours × volts ÷ 1000

Abbreviated: Wh = mAh × V ÷ 1000

Calculator: Milliamp Hours to Watt Hours Calculator

Example

Let's say your phone has a 3.7V 3000mAh battery.

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

3000mAh × 3.7V ÷ 1000 = 11.1Wh

In this example, your phone battery has a 11.1Wh capacity.

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Alex Beale
Alex Beale
Alex Beale is the founder and owner of Footprint Hero. As a self-taught DIY solar enthusiast, Alex has spent 4 years producing educational solar content across YouTube, TikTok, Instagram, and the Footprint Hero blog. During that time, he's built Footprint Hero to over 7 million blog visits and 18 million YouTube views. He lives in Tennessee.