Appliance Energy Cost Calculator

Use the wattage on the appliance label or a plug-in meter. Devices that cycle (refrigerators, heaters on thermostats) use less than their label on average.

Tapeline — Appliance Energy Cost Calculator

Printed September 29, 2026

Power draw1500 W
Hours used per day4
Days used per month30
Electricity rate0.17 $/kWh

Results update as you type.

$/kWh

Find this on your utility bill: total charges ÷ kWh used gives an all-in rate.

How it’s calculated

  • kWh per day = watts × hours ÷ 1,000
  • Monthly kWh = daily kWh × days
  • Cost = kWh × rate; yearly = monthly × 12

Worked example

A 1,500 W space heater, 4 hours a day, 30 days, at $0.17/kWh.

Inputs

Power draw
1500 W
Hours used per day
4
Days used per month
30
Electricity rate
0.17 $/kWh

Results

Cost per month
$30.60
Cost per year
$367.20
Cost per day of use
$1.02
Energy per month
180 kWh
Energy per day of use
6 kWh

Load this example into the calculator

Assumptions and limits

  • Constant power while on. Time-of-use and tiered rates are not modelled.

Verify the result against the applicable local code, adopted code edition, manufacturer instructions and project requirements. See our methodology.

Questions

How much does a 1500 watt heater cost to run?

At $0.17/kWh it costs about $0.26 per hour, or $30.60 a month at 4 hours a day.

How do I find my electricity rate?

Divide the total on your bill by the kWh used. That all-in rate includes delivery charges.