How Many Watts In A 12 Volt Battery? (Calculator + Chart)

A lot of people have asked us to determine how many watts are in a 12-volt battery. 12-volt battery wattage is very simple to solve, and we will show you how. On top of that, you can use:

1. ‘How Many Watts In A 12V Battery’ Calculator found below. Basically, you just insert the battery capacity in amp-hours (Ah) and the calculator will automatically tell you how many watts there are in that 12V battery.
2. 12V Battery Wattage Chart. It’s a table that tells you how many watts are in all 12V battery sizes; from a very small 1000mAh battery to a very enormous 5,000Ah battery.

Let’s clear some things up first:

When we ask about 12V watts, we actually mean watt-hours. Watts and watt-hours are not the same.

Example: How many watts are in a 100Ah 12 volt battery? Such a battery holds 1200Wh. These are 1200 watt-hours. We usually say that a 100Ah 12V battery holds 1200 watts.

1200 watt-hours mean that a battery can do any of the following:

• Produce 1200 watts of power for 1 hour. Example: It can power a 1200-watt air conditioner for 1 hour.
• Produce 600 watts of power for 2 hours. Example: It can run a 600-watt refrigeration for 2 hours.
• Produce 400 watts of power for 3 hours.
• …
• Produce 1 watt of power for 1200 hours (that’s 50 days).

We hope you get the point here (if not, you can use the comments below and we’ll help you out).

Here is how simple it is to calculate how many watts are in a 12-volt battery:

12V Battery Watts = Number of Ah (Amp-Hours) × 12V

Example: How many watts are in an 80Ah 12V car battery? Here is how you can calculate that:

80Ah 12V Car Battery Watts = 80Ah × 12V = 1080 Watt-Hours

To help you out, we provide you with a calculator that does this calculation automatically. Further on, you will also find a chart with calculated wattages for 20+ batteries:

How Many Watts In A 12V Battery Calculator

You simply insert how many amp-hours (Ah) battery you have, and the calculator will automatically calculate the wattage (in watt-hours, of course):

Here is how to use this 12V battery calculator:

Let’s say you have a 200Ah 12-volt battery and want to know how many watts there are in a 200Ah battery (voltage: 12V). Simply slide the slider to ‘200’ and you will get the result: 200Ah 12V battery contains 2400 watt-hours (or 2400 watts, as we sometimes say).

This is just one example. The following table will tell you how many watts do different batteries produce:

12V Battery Wattage Chart

Hopefully, you can use both this table and the calculator above to check how many watts are in your 12V battery. If you need any help with the calculation, you can use the comments below and we’ll help you out.