SEER Rating Calculator

Creator: Cierra Benson · Reviewed by Stephen Hamstra, P.E.

Use our SEER Rating calculator to find cooling efficiency from AC size, power, and run time. Get fast SEER results with simple steps.

SEER Rating — Reference

SEER Range	Efficiency Tier	Notes
Below 13	Below Minimum	Below typical U.S. minimum standard for most regions
13 – 15.9	Standard	Meets current minimum efficiency standard
16 – 19.9	Good	Often within ENERGY STAR® qualifying range
20+	Excellent	High-efficiency / premium systems

⚠ This calculator applies the fundamental SEER definition (cooling output ÷ electrical energy input). Official DOE-certified ratings require the full seasonal test procedure with temperature bins and part-load performance. Since 2023, new U.S. equipment is rated under SEER2 (DOE Appendix M1), which is not numerically identical to SEER.

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A SEER Rating calculator helps you check AC cooling use. It tells you how much cool air you get per watt of power. This can help you pick an AC or heat pump.

SEER means Seasonal Energy Efficiency Ratio. A high SEER means more cooling for each watt used. Think of it like miles per gallon. More miles from less fuel means a better car. More cool air from less power means a better AC.

SEER Rating Formula

Our tool uses this SEER formula:

SEER = Total Cooling Output (Btu) / Total Electric Energy (Wh)

If you know AC size, power, and run time, use these steps.

Cooling Output = Cooling Size (Btu/h) × Run Time (h)
Energy Used = Power (W) × Run Time (h)
SEER = Cooling Output (Btu) / Energy Used (Wh)

The run time drops out when both sides use the same time. So you can also use:

SEER = Cooling Size (Btu/h) / Power (W)

The tool can use tons, kW, W, or HP for input. It can use Btu, kBtu, MMBtu, Wh, kWh, or MWh for total data.

How to Use Online SEER Rating Calculator Step by Step

Enter the AC cooling size.
Pick the right size unit.
Enter the power used.
Enter the run time.
Click Calculate. The tool shows your SEER, cooling output, and energy use.

Example SEER Rating Calculation

Say an AC has a size of 36,000 Btu/h. It uses 2,000 W. It runs for 1,500 hours.

First, find the cool output.

36,000 × 1,500 = 54,000,000 Btu

Next, find the power use.

2,000 × 1,500 = 3,000,000 Wh

Now find SEER.

54,000,000 ÷ 3,000,000 = 18 Btu/Wh

So, the SEER is 18.

SEER Savings Calculator Heat Pump

You can use this tool for a heat pump too. It can help you check power use. A higher SEER may mean less power for cooling. Your bill can still vary. Power rates, weather, use, and AC size all matter.

AC SEER Rating Calculator

An AC SEER rating calculator gives a quick math check. It can help you compare AC units. Note that a real SEER or SEER2 label uses set test rules. Home use may give a different result.

Final Verdict

The SEER Rating calculator makes the math fast. Enter your cooling size, power, and run time. Then check the result. Use it to compare AC and heat pump cooling use.

FAQs

What does SEER mean?

SEER means Seasonal Energy Efficiency Ratio.

What is a good SEER rating?

A high SEER often means better cooling use. Cost and use also matter.

What is the SEER formula?

SEER is total cooling in Btu divided by total power in Wh.

Can I use it for a heat pump?

Yes. You can use the same basic math for heat pump cooling.

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