A free electricity cost calculator that prices any device a day, a month and a year at your price per kWh.
See what a device costs to run a day, a month and a year at your price per kWh.
Your numbers
Left empty, it uses today's US average of 0,196 USD per kWh (2026-08-01, US Bureau of Labor Statistics). Your own bill's price is better.
Your result
Fill in the fields above to see your result.
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Paste the code into any page: WordPress, Webflow, Squarespace, Ghost or plain HTML. It's free with the credit under it, which links back to navid.me.
This free electricity cost calculator shows what a device costs to run a day, a month and a year, from its watts, the hours you use it and your price per kWh.
In US dollars it starts from today's US average price, from the US Bureau of Labor Statistics, and you can type your own from your bill.
I built it because a space heater, a gaming PC or a second fridge can quietly add a lot to a bill, and nobody knows which until the bill arrives. This puts a price on each one before it does.
Here's the formula, a worked example, and where the watts and the price come from.
TL;DRKey takeaways
What is an electricity cost calculator?
An electricity cost calculator works out what a device costs to run. Electricity is billed by the kilowatt-hour (kWh), the energy a 1,000-watt device uses in an hour.
So a device's cost comes down to 3 numbers: its watts, its hours, and your price for each kWh.
How to use the electricity cost calculator
You need the device's watts and how long you use it.
The table under the result shows the same device at 1 to 24 hours a day.
A worked example
Here's the example the calculator loads when you press Try an example: a 1,500 W space heater on 4 hours a day, at the US average of 19.6 cents a kWh.
1,500 W × 4 hours ÷ 1,000 = 6 kWh a day. 6 kWh × $0.196 = $1.18 a day.
- A month
- $8.95
- A year
- $107.38
- A month
- $35.79
- A year
- $429.53
- A month
- $71.59
- A year
- $859.07
- A month
- $214.77
- A year
- $2,577.20
A month here is 30.4 days, the average month across a year.
Where the numbers come from
Both numbers are easy to find, and both change the answer.
The watts
They're on the label, the plug or the charger, often as W. A device that lists amps and volts uses amps × volts in watts.
Your price per kWh
It's on your electricity bill. Use the total with delivery charges divided by the kWh you used, for the real price.
The US average
The calculator reads the US Bureau of Labor Statistics' average once a day through the St. Louis Fed's FRED data. In another currency, type your own.
Mistakes to avoid
These are the ways an electricity estimate comes out wrong.
- Using the maximum watts for a device that cycles on and off, like a fridge
- Forgetting standby power for devices left plugged in
- Using the energy price alone and leaving out delivery charges
- Counting a full day for a device that runs only some of the hours
Working from home? The freelance rate calculator can count your power bill as a cost of doing business.
Who is the electricity cost calculator for?
It's for anyone watching their power bill or choosing between 2 devices, and these tools help with the rest.
- Gas trip calculator – for what a drive costs in fuel
- Unit price calculator – for the best buy in a shop
- Percentage calculator – for how much a price went up
- Currency converter – for prices in another country
- Freelance rate calculator – for costs to cover in your rate
Price your biggest devices once, and the bill stops being a surprise.
Plan your money with your AI
Take your numbers further in
Electricity Cost Calculator FAQs
Questions about the electricity cost calculator? Here's what to know.
An electricity cost calculator works out what a device costs to run from its watts, its hours and your price per kWh.
This free one shows the cost a day, a month and a year.
Multiply the watts by the hours and divide by 1,000 for kWh, then multiply by your price per kWh.
A 1,500 W heater for 4 hours is 6 kWh, $1.18 at 19.6 cents.
A kilowatt-hour is the energy a 1,000-watt device uses in 1 hour.
Electricity bills charge by it.
It was 19.6 cents a kWh in August 2026, by the US Bureau of Labor Statistics.
The calculator reads the latest figure each day.
A 1,500 W heater costs about 29 cents an hour at 19.6 cents a kWh.
4 hours a day is about $36 a month.
On its label, its plug or its charger.
If it lists amps and volts, multiply them for watts.
On your electricity bill.
Divide the total by the kWh you used for the real price with delivery charges.
A fridge's compressor cycles on and off, so it runs only part of each hour.
Use the yearly kWh on its energy label for a truer figure.
Yes, pick your currency and type your price per kWh.
The US average only fills in for US dollars.
Yes, it's free with no sign-up.
It runs in your browser.
I did.
I'm Navid Moazzez, and I made the electricity cost calculator as one of my free tools on navid.me.
More about me.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
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