kW/Ton To EER Calculator: Convert kW/Ton To EER Rating (+ Chart)

kW/ton (kilowatts per ton) and EER (Energy Efficiency Ratio) are both measures of cooling efficiency. If you have efficiency expressed in kW/ton, you can calculate the EER rating just from that; we’ll show you how.

To help us out, we created these 2 resources:

1. kW/Ton To EER Calculator. Just insert kW/ton, and you get the EER equivalent right away.
2. kW/Ton To EER Conversion Chart. We converted efficiencies ranging from 0.1 kW/ton to 3 kW/ton into EER ratings. All the results are found in the all-encompassing chart near the end of this page.

Just a quick example: What is the EER rating of a 1.1 kW/ton unit? You can use the calculator or consult the chart below to see that 1.1 kW/ton is equal to a 10.91 EER rating.

Let’s start with the online calculator you can use yourself:

For example, if you need to convert 1.3 kW/ton to EER, you just insert ‘1.3’ in the kW/ton input field. Here is the result you get (screenshot):

We can immediately see that 1.3 kW/ton is equal to 9.23 EER. From 2023 onwards, we are using this new EER2 ratio.

Let’s look at how easy the math is behind this calculation:

How To Convert kW/Ton To EER? (Formula)

EER is defined as BTU output divided by the input wattage. kW is basically the input wattage divided by output in tons. We can combine these units into this single kW/ton to EER equation:

EER = 12 / (kW/Ton)

In short, we need to take 12 and divide it by kW/ton to get the EER rating. You can see that kW/ton and EER are inversely related; the higher kW we have, the lower the EER is (lower efficiency), and visa versa.

Quick example: If we have an HVAC unit with a very high 0.8 kW/ton efficiency, what is its EER rating?

Let’s just insert 0.8 kW in the equation above like this:

EER (0.8 kW/Ton) = 12 / 0.8 kW/Ton = 15.00 EER

We see that 0.8 kW/ton is equal to a 15 EER rating.

This was just one example. Here is the full conversion chart, ranging from 0.1 kW/ton to 3 kW/ton:

kW/Ton To CoP Conversion Chart