Battery Capacity Calculator

Batteries are integral to our lives, many of the items we use and interact with operate off of battery power. Use this tool to calculate just how long the battery life is of those items.

Required Information

Voltage:

Stored Energy:

Battery Capacity:

What is Battery Capacity?

Battery capacity is referring to the amount of amp hours it can provide power for. For example, if you have a device that is 2 ampere hours, it can provide a current of one amp for 2 hours or two amps for 1 hour.

How is Battery Capacity Calculated

To calculate battery capacity, you must know the value of two variables: voltage and stored energy. Then you can use this formula and plug the values into it to get the battery capacity:

An image of the formula for calculating battery capacity.

Where:

BC = battery capacity

SE = stored energy (in watt-hours)

V = voltage (in volts)

Understanding Your Results

After using this tool, you will get a single number as your result that is displayed in ampere hours, by default. This number reflects how long the battery can last when running a single amp current. When using ampere hours, if the current is two amps then the battery capacity would be half that number, three amps would make the battery capacity one third of that number, and so on.

You can change the unit of measurement to milliampere hours, when you do this the number itself changes but it is still equal to the original ampere hours value you initially saw.

How to Use the Battery Capacity Calculator

If you are trying to find out the battery capacity of something you are in the right place. You can use this tool by following these steps:

Enter the voltage of the battery, by default volts is the selected unit of measurement but this can be changed if needed.

Enter the total stored energy value, watt-hours is the default unit of measurement but you should change it if you know the value in another unit.

Hit the calculate button and get the battery capacity in ampere hours or milliampere hours in less than a second!

Calculation Example

You have a battery that is 12 volts. It has a stored energy value of 60 watt-hours. You can plug these numbers into the formula we provided above, or use our calculator to do the math for you.

We enter 12 into the voltage field and then we enter 60 into the stored energy field. After hitting calculate we get our battery capacity answer of 5 ampere hours, or 5,000 milliampere hours.

Battery Capacity - Frequently Asked Questions

Battery capacity should matter to you, it determines how long you can use something before you need to replace the batteries or charge them. It also dictates how long it may take to charge them back up.

Once a battery is under 20% is it generally considered to be low.

Extreme heat is one of the most common causes of deteriorating battery health.

Amp hours, or ampere hours, is a unit of measurement for a battery's energy capacity. This value tells us how long the battery can last, depending on the amps drawn from it. If you have a battery with 8 amp hours, it can provide 8 amps of current for one hour, 16 amps of current for half an hour, 4 amps of current for 2 hours, and so on.

A 100 amp-hour battery can last for one hour if it is delivering 100 amps of current. If it is only delivering 50 amps, it can last for 2 hours, if it is delivering 200 amps it will only last 30 minutes.

Create Date: October 13, 2024

Last Modified Date: October 13, 2024