Electricity Cost Calculator

How to use

How to use Electricity Cost Calculator

01
Enter the wattage
Type the appliance's watts or pick a preset (AC, fridge, heater, PC).
02
Add usage hours
Enter how many hours a day it runs.
03
Set your rate
Add your price per kWh in your currency.
04
See the cost
View the cost per day, month, and year, plus kWh used.

Use cases

Common use cases

—A homeowner finds which appliance drives their bill.
—A renter estimates the cost of running a space heater.
—A gamer calculates their PC's monthly running cost.
—A budgeter compares an old fridge's cost to a new efficient one.

Overview

See what an appliance actually costs to run

Enter an appliance's wattage, how long it runs, and your electricity rate (per kWh), and get the cost per hour, day, month, and year. It turns an abstract wattage on a label into a real number on your bill — the difference between guessing and knowing which device is quietly expensive.

Spot the energy drains worth changing

Running the numbers on a space heater, old fridge, gaming PC, or always-on router shows where changing habits or hardware pays for itself. The formula is simple — kWh = watts × hours ÷ 1000, cost = kWh × rate — but doing it per device across a month is exactly what this calculator automates.

Features

01: Cost per day, month, and year
02: Appliance wattage presets (AC, fridge, heater, PC & more)
03: kWh consumption breakdown
04: Any currency and price-per-kWh rate
05: Runs entirely in your browser

FAQ

Frequently asked questions

How do I calculate the cost of running an appliance?+

Multiply the appliance's power (watts) by hours used, divide by 1000 to get kilowatt-hours (kWh), then multiply by your electricity rate. For example, a 1500W heater running 5 hours = 7.5 kWh; at $0.15/kWh that's $1.13 per day. This tool does it instantly and projects monthly and yearly costs.

Where do I find my electricity rate?+

Your price per kWh is on your electricity bill (often called the 'unit rate' or 'energy charge'). Enter it in the rate field. Typical rates range from about $0.10 to $0.35 per kWh depending on your region.

How do I know an appliance's wattage?+

Check the label on the device or its power supply, or use one of the built-in presets for common appliances. Motors and heaters draw the most; standby devices draw very little.

Is my data stored?+

No. Everything is calculated locally in your browser and nothing is uploaded or saved.