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Electricity Cost Calculator

Estimate how much any appliance adds to your power bill. Enter wattage, daily runtime, electricity rate, and billing period to compare devices, spot energy hogs, and plan lower-cost usage.

Check the label on your appliance for wattage.

Check your electricity bill for the rate per kWh.

How to Use

1 Enter the appliance wattage (check the label on your device).
2 Enter hours per day the appliance runs.
3 Enter your electricity rate per kWh (default is $0.12).
4 Set the billing period in days (default is 30).
5 Click Calculate.
6 Repeat the calculation for other appliances to see which devices cost the most to run.

Formula

Daily Energy Daily kWh = (Wattage x Hours Per Day) / 1000
Billing Period Energy Period kWh = Daily kWh x Days
Daily Cost Daily Cost = Daily kWh x Price Per kWh
Monthly Cost Monthly Cost = Period kWh x Price Per kWh
Yearly Cost Yearly Cost = Daily kWh x 365 x Price Per kWh

Cost of Running a Space Heater

A 1500W space heater running 8 hours/day at $0.12/kWh costs $1.44/day, $43.20/month, and $525.60/year (360 kWh/month).

Why It Matters

Appliance costs are easy to underestimate because they are spread across the month. Converting watts and hours into dollars helps you decide whether to replace an old device, change runtime habits, or move that expense into your budget more accurately.

Who Uses This Calculator?

  • • Homeowners and renters estimating electricity costs, appliance usage, solar savings, or EV charging expenses.
  • • Solar shoppers, EV owners, and households comparing energy upgrades before requesting quotes or changing usage habits.
  • • Anyone who wants a quick estimate of home energy costs using clear assumptions.

Frequently Asked Questions

Where can I find my electricity rate?
Check your electricity bill for the rate per kWh. The average US residential rate is often around $0.12-$0.18 per kWh, but the actual price varies a lot by region, provider, and time-of-use plan.
How do I find the wattage of my appliance?
Most appliances have a label showing wattage (W) or amperage (A) and voltage (V). If only amps and volts are shown, multiply them: Watts = Amps x Volts.
Why is my real bill higher than this estimate?
The calculator estimates one appliance at a constant rate. Your real bill may include tiered pricing, taxes, delivery fees, seasonal rate changes, standby power, and many other devices running at the same time.
Does this account for standby power usage?
No. This calculator focuses on active usage. Many electronics and smart devices still draw a small amount of electricity while idle or turned off.

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This calculator provides estimates for informational purposes only. Verify results with a qualified professional for important decisions.