Air conditioner electricity cost calculator

A 1.5 kW AC averaging 55% compressor load costs about $0.15 per scheduled hour—or $35.64 across a 30-day month at eight hours daily—using an illustrative $0.18/kWh rate. Replace the power, runtime, currency and tariff below.

Quick reference

Electrical input changes the answer.

These examples use a 55% average compressor load and an illustrative $0.18/kWh rate. They are starting points, not universal AC ratings.

Electrical inputAverage drawScheduled-hour cost30 days · 8h/day

500 W0.275 kW$0.05$11.88

1 kW0.550 kW$0.10$23.76

1.5 kW0.825 kW$0.15$35.64

2 kW1.100 kW$0.20$47.52

Your AC scenario

Replace the example with your numbers.

Use electrical input—not tons or BTU/h—then enter operating hours, average compressor activity and the per-kWh rate from your bill.

Your reading

Planning range · based on your inputs

Estimated monthly cost$36.04

Likely planning range $29.55–$42.52

Per day$1.18

Per active hour$0.15

Per year$432.43

Energy / month200.2 kWh

FormulakW × runtime × tariff

Month52 weeks ÷ 12

Data qualitySelf-entered estimate

Transparent method

The AC cost formula

Cost = input kW × scheduled hours × average compressor load × tariff

Cooling capacity describes heat removal. Electrical input describes power purchased from the grid. They are related through efficiency, but they are not interchangeable.

Understand duty cycle →

Run a range

Weather changes compressor activity.

Mild load · 35%Use this as a sensitivity case, then replace it with metered or manufacturer-app evidence when available.

Typical load · 55%Use this as a sensitivity case, then replace it with metered or manufacturer-app evidence when available.

Hot or humid · 75%Use this as a sensitivity case, then replace it with metered or manufacturer-app evidence when available.

Before trusting the result

Four inputs matter most.

Use rated electrical input or measured watts—not the cooling-capacity number.
Increase average load for heat waves, humidity, direct sun, low set points or poor insulation.
Use the rate that applies while the AC operates, including peak pricing when relevant.
Keep fixed utility charges outside the appliance calculation unless AC use changes the charge.

AC running-cost answers

What changes the result?

Use electrical input and average compressor activity to avoid the two most common air-conditioning cost errors.

How do I calculate air-conditioner electricity cost?

Multiply electrical input in kW by scheduled hours, average compressor-load share and the electricity rate. Use watts from the electrical label—not cooling tons or BTU/h.

How much does a 1.5 kW AC cost to run?

At $0.18/kWh and 55% average compressor load, a 1.5 kW AC costs about $0.15 per scheduled hour or $35.64 over 30 days at eight hours per day.

Does an inverter AC use its rated power continuously?

Usually not. An inverter AC can reduce compressor output after the room approaches its set temperature. Use measured average power or model a realistic compressor-load range.

Should I enter AC tons or BTU/h as power?

No. Tons and BTU/h describe cooling capacity. Enter rated or measured electrical input in watts or kW because that is the power purchased from the grid.