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Electricity Cost Calculator

DeveloperMath

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INPUT

Auto Process

OUTPUT

Client Side

Period	Energy (kWh)	Cost ($)
Daily	-	-
Weekly	-	-
Monthly	-	-
Yearly	-	-

Environmental Impact

CO₂ Emissions (yearly)

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Guide

Electricity Cost Calculator

Quickly estimate how much electricity any device or appliance costs you per day, week, month, and year. Enter the wattage, usage hours, and your electricity rate to get instant cost breakdowns and CO₂ emission estimates.

How to Use

Enter your device wattage in watts (check the label on your appliance or its manual). Set how many hours per day you use the device. Enter your electricity rate in dollars per kilowatt-hour (check your utility bill), or pick a country preset. Optionally set the number of identical devices. Results update instantly showing energy consumption and cost for each time period, plus yearly CO₂ emissions.

Features

Instant Calculations – Results update in real time as you type, no button clicks needed
Multi-Period Breakdown – See daily, weekly, monthly, and yearly energy and cost figures
Country Rate Presets – Quick-select average electricity rates for US, UK, EU, Australia, Canada, and India
Multiple Devices – Multiply costs for identical appliances with the quantity field
CO₂ Emissions – Estimate yearly carbon dioxide emissions based on global average grid intensity

Understanding Your Electricity Bill

Electricity is measured in kilowatt-hours (kWh). One kWh equals using 1,000 watts for one hour. Your utility company charges a rate per kWh, which varies by region, time of day, and usage tier. The formula is straightforward: multiply wattage by hours of use, divide by 1,000 to get kWh, then multiply by your rate to get cost.

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 FAQ

What is a kilowatt-hour (kWh)?

A kilowatt-hour is a unit of energy equal to using 1,000 watts of power for one hour. It is the standard billing unit for residential electricity. For example, a 100-watt light bulb running for 10 hours consumes 1 kWh.
How do I find my electricity rate?

Your electricity rate is listed on your utility bill, usually expressed in cents or dollars per kWh. In the US, the average residential rate is about $0.16 per kWh, but it varies significantly by state and provider. Some plans have tiered rates that increase with higher usage.
What is the carbon footprint of electricity usage?

The CO₂ emissions from electricity depend on how the power is generated. The global average is about 0.417 kg CO₂ per kWh. Regions that rely heavily on coal produce more emissions per kWh, while areas with hydroelectric or nuclear power produce less. Reducing electricity consumption directly lowers your carbon footprint.
Why does the same appliance cost more to run in some countries?

Electricity rates vary dramatically worldwide based on energy sources, infrastructure costs, government subsidies, and taxes. Countries with abundant renewable resources like hydroelectric power tend to have lower rates, while island nations and regions dependent on imported fossil fuels typically have higher costs.