Appliance Energy Usage & Running Cost Calculator
Calculate estimated appliance electricity consumption in kilowatt-hours (kWh) and the cost to run one or more household appliances. Use this appliance electricity cost calculator to estimate daily, monthly and yearly use from each appliance’s wattage, quantity, hours of use, days per month, and your electricity price per kWh.
Build your appliance list
Use the power rating on the appliance label where possible. All starter values are examples you can replace.
$0.15 is an illustrative starter rate, not a universal tariff. Replace it with the rate on your bill. Changing currency does not convert exchange rates.
Appliances (1)
Estimates update automatically as you edit the inputs.
How to calculate appliance energy usage
An appliance energy usage calculator estimates electricity consumption from power and time. The result is shown in kilowatt-hours (kWh), the energy unit commonly used on electricity bills. One kilowatt-hour equals 1,000 watt-hours. The U.S. Energy Information Administration explains watts and kilowatt-hours.
For monthly use, multiply by the number of days the appliance runs during the month. For yearly use, this calculator multiplies the entered monthly estimate by 12, assuming a similar usage pattern in each month.
For multiple appliances, calculate each item using its own power rating, quantity and usage schedule, then add the kWh totals. This page does that automatically and also estimates the running cost at the electricity rate you enter.
Worked example: a 100-watt appliance
Suppose one appliance draws 100 watts and runs for 4 hours a day for 30 days. The estimated monthly energy is 100 × 4 × 30 ÷ 1,000 = 12 kWh. At an illustrative rate of $0.15 per kWh, its estimated cost is 12 × $0.15 = $1.80 for that month.
This is a calculation example, not a claim about the average cost of electricity. Your result depends on the power actually drawn, how long it runs, and your own rate. Virginia Cooperative Extension describes the same wattage-and-hours method.
What information should you enter?
1. Appliance wattage
Look for the power rating in watts (W) on the product label, manual or manufacturer’s specifications. If the label lists kilowatts (kW), multiply that figure by 1,000 to convert it to watts. If only volts and amps are shown, converting those to watts can require assumptions about power factor and the type of electrical load, so use a manufacturer-provided wattage when available.
2. Hours of use and days per month
Enter the hours the appliance actually operates each day and the number of days you use it in a typical month. A washing machine used for short cycles should be estimated using its operating time, not the entire day it remains plugged in.
3. Quantity and electricity rate
Enter how many identical appliances you use. For the price per kWh, use the energy rate from your own electricity bill or tariff. Some bills also include fixed fees, taxes, tiered rates, time-of-use rates and other charges; this calculator estimates energy-related cost only and does not reproduce a full utility bill.
Estimate electricity use for common home appliances
Use this appliance power consumption calculator to estimate ceiling fan electricity use, refrigerator wattage-based consumption, microwave or electric oven electricity consumption, water heater energy use, air fryer running cost, coffee maker wattage usage, and the energy used by an air-conditioning unit. These are examples of possible inputs, not fixed wattage recommendations; enter the rated or measured power for your own model.
For air conditioning and heating equipment, the electrical draw may vary as the compressor or heating element cycles and as operating conditions change. Refrigerators also switch on and off to maintain temperature, so multiplying the maximum rated wattage by every hour they are plugged in can overestimate usage. Use measured average power or a reliable energy-use figure when you have one. Virginia Cooperative Extension explains this limitation for refrigerators.
Use the estimate to find your biggest energy loads
Start by comparing the monthly kWh contribution of each item in the calculator. An appliance with a high wattage is not automatically the biggest monthly user; duration and frequency matter too. A lower-power device operating for many hours can use more electricity over a month than a high-power device used briefly.
- Check the monthly kWh estimate for every major appliance instead of comparing wattage alone.
- Use the appliance label, energy label or measured consumption when available.
- Review operating schedules, temperature settings and standby behavior where it is safe and practical to do so.
- Compare similar appliances using annual energy estimates and the same electricity rate.
For more background on appliance energy labels and efficiency, see the U.S. Department of Energy’s Energy Saver guide. Product labels and estimates are useful comparisons, but your actual bill can differ with usage, weather, tariffs and other household loads.
Frequently asked questions
How do I calculate how much electricity an appliance uses?
Multiply its wattage by the hours it runs to get watt-hours. Divide by 1,000 to convert watt-hours to kWh. For a month, multiply by the number of days it operates that month. For example, 100 W × 4 hours × 30 days ÷ 1,000 = 12 kWh.
How do I calculate the cost of running an appliance?
First calculate the appliance’s energy use in kWh. Then multiply that figure by your electricity price per kWh. If an appliance uses 12 kWh and your rate is $0.15/kWh, the estimated energy cost is $1.80. Replace the example rate with the one that applies to you.
How much electricity does a 1,000-watt appliance use in one hour?
If it draws a steady 1,000 watts for one hour, it uses 1 kWh. If it cycles on and off or changes power, actual use will be lower or higher than an estimate based on a constant 1,000-watt draw.
Where can I find my appliance’s wattage?
Check the rating plate, product label, owner’s manual or manufacturer’s specifications. A plug-in energy meter can help measure consumption for compatible appliances. Make sure the value you enter represents the appliance’s operating draw rather than a different electrical rating.
Does this calculator predict my exact electricity bill?
No. It estimates the energy and running cost from your inputs. A real bill may include tiered or time-based prices, taxes, fixed charges, fuel adjustments and other household use. Appliance behavior and weather can also change consumption.
Why might a refrigerator or inverter air conditioner use less electricity than the calculation suggests?
Their power draw can vary. A refrigerator cycles its compressor on and off, while an inverter air conditioner can adjust output to demand. Multiplying maximum rated wattage by every hour the appliance is plugged in may overestimate the real energy use. Use an average measured draw or reliable annual kWh estimate when available.
What electricity rate should I enter?
Enter the price per kWh that applies to your electricity use. If your bill uses multiple tiers or time-of-use rates, the result is only an estimate unless you calculate and enter a suitable effective rate. The currency selector changes how the cost is displayed; it does not convert between currencies.
Can I estimate several appliances at the same time?
Yes. Add one row for each appliance or group of identical appliances. Enter its wattage, quantity, hours per day and days used per month. The calculator totals their estimated monthly and yearly energy use and cost, and can export the itemized results as a CSV file.
How much does a 1,500-watt appliance cost to run?
If a 1,500-watt appliance draws its rated power for one hour, it uses 1.5 kWh. Multiply 1.5 by your electricity price per kWh to estimate the one-hour energy cost. For example, at $0.15/kWh, that is $0.225, or about $0.23 before any other bill charges. Actual use can differ if the appliance cycles or changes power draw.
Sources and calculation notes
The calculator uses the standard relationship between power, time and energy. The sources below explain the units and the limitations involved in estimating real appliance consumption.
- U.S. Energy Information Administration — Measuring electricity
Explains watts, watt-hours and kilowatt-hours. - Virginia Cooperative Extension — Estimating appliance and home electronic energy use
Provides the wattage × hours ÷ 1,000 method and discusses operating cycles. - U.S. Department of Energy — Energy Saver guide
Provides consumer guidance on appliance energy labels and efficiency.
This free calculator provides estimates for general information. It does not measure electricity, access your utility account, determine electrical safety, or replace your actual bill. Results depend on the accuracy of your inputs and the way each appliance operates.
Appliance Energy Usage & Running Cost Calculator
Calculate estimated appliance electricity consumption in kilowatt-hours (kWh) and the cost to run one or more household appliances. Use this appliance electricity cost calculator to estimate daily, monthly and yearly use from each appliance’s wattage, quantity, hours of use, days per month, and your electricity price per kWh.
Build your appliance list
Use the power rating on the appliance label where possible. All starter values are examples you can replace.
$0.15 is an illustrative starter rate, not a universal tariff. Replace it with the rate on your bill. Changing currency does not convert exchange rates.
Appliances (1)
Estimates update automatically as you edit the inputs.
How to calculate appliance energy usage
An appliance energy usage calculator estimates electricity consumption from power and time. The result is shown in kilowatt-hours (kWh), the energy unit commonly used on electricity bills. One kilowatt-hour equals 1,000 watt-hours. The U.S. Energy Information Administration explains watts and kilowatt-hours.
For monthly use, multiply by the number of days the appliance runs during the month. For yearly use, this calculator multiplies the entered monthly estimate by 12, assuming a similar usage pattern in each month.
For multiple appliances, calculate each item using its own power rating, quantity and usage schedule, then add the kWh totals. This page does that automatically and also estimates the running cost at the electricity rate you enter.
Worked example: a 100-watt appliance
Suppose one appliance draws 100 watts and runs for 4 hours a day for 30 days. The estimated monthly energy is 100 × 4 × 30 ÷ 1,000 = 12 kWh. At an illustrative rate of $0.15 per kWh, its estimated cost is 12 × $0.15 = $1.80 for that month.
This is a calculation example, not a claim about the average cost of electricity. Your result depends on the power actually drawn, how long it runs, and your own rate. Virginia Cooperative Extension describes the same wattage-and-hours method.
What information should you enter?
1. Appliance wattage
Look for the power rating in watts (W) on the product label, manual or manufacturer’s specifications. If the label lists kilowatts (kW), multiply that figure by 1,000 to convert it to watts. If only volts and amps are shown, converting those to watts can require assumptions about power factor and the type of electrical load, so use a manufacturer-provided wattage when available.
2. Hours of use and days per month
Enter the hours the appliance actually operates each day and the number of days you use it in a typical month. A washing machine used for short cycles should be estimated using its operating time, not the entire day it remains plugged in.
3. Quantity and electricity rate
Enter how many identical appliances you use. For the price per kWh, use the energy rate from your own electricity bill or tariff. Some bills also include fixed fees, taxes, tiered rates, time-of-use rates and other charges; this calculator estimates energy-related cost only and does not reproduce a full utility bill.
Estimate electricity use for common home appliances
Use this appliance power consumption calculator to estimate ceiling fan electricity use, refrigerator wattage-based consumption, microwave or electric oven electricity consumption, water heater energy use, air fryer running cost, coffee maker wattage usage, and the energy used by an air-conditioning unit. These are examples of possible inputs, not fixed wattage recommendations; enter the rated or measured power for your own model.
For air conditioning and heating equipment, the electrical draw may vary as the compressor or heating element cycles and as operating conditions change. Refrigerators also switch on and off to maintain temperature, so multiplying the maximum rated wattage by every hour they are plugged in can overestimate usage. Use measured average power or a reliable energy-use figure when you have one. Virginia Cooperative Extension explains this limitation for refrigerators.
Use the estimate to find your biggest energy loads
Start by comparing the monthly kWh contribution of each item in the calculator. An appliance with a high wattage is not automatically the biggest monthly user; duration and frequency matter too. A lower-power device operating for many hours can use more electricity over a month than a high-power device used briefly.
- Check the monthly kWh estimate for every major appliance instead of comparing wattage alone.
- Use the appliance label, energy label or measured consumption when available.
- Review operating schedules, temperature settings and standby behavior where it is safe and practical to do so.
- Compare similar appliances using annual energy estimates and the same electricity rate.
For more background on appliance energy labels and efficiency, see the U.S. Department of Energy’s Energy Saver guide. Product labels and estimates are useful comparisons, but your actual bill can differ with usage, weather, tariffs and other household loads.
Frequently asked questions
How do I calculate how much electricity an appliance uses?
Multiply its wattage by the hours it runs to get watt-hours. Divide by 1,000 to convert watt-hours to kWh. For a month, multiply by the number of days it operates that month. For example, 100 W × 4 hours × 30 days ÷ 1,000 = 12 kWh.
How do I calculate the cost of running an appliance?
First calculate the appliance’s energy use in kWh. Then multiply that figure by your electricity price per kWh. If an appliance uses 12 kWh and your rate is $0.15/kWh, the estimated energy cost is $1.80. Replace the example rate with the one that applies to you.
How much electricity does a 1,000-watt appliance use in one hour?
If it draws a steady 1,000 watts for one hour, it uses 1 kWh. If it cycles on and off or changes power, actual use will be lower or higher than an estimate based on a constant 1,000-watt draw.
Where can I find my appliance’s wattage?
Check the rating plate, product label, owner’s manual or manufacturer’s specifications. A plug-in energy meter can help measure consumption for compatible appliances. Make sure the value you enter represents the appliance’s operating draw rather than a different electrical rating.
Does this calculator predict my exact electricity bill?
No. It estimates the energy and running cost from your inputs. A real bill may include tiered or time-based prices, taxes, fixed charges, fuel adjustments and other household use. Appliance behavior and weather can also change consumption.
Why might a refrigerator or inverter air conditioner use less electricity than the calculation suggests?
Their power draw can vary. A refrigerator cycles its compressor on and off, while an inverter air conditioner can adjust output to demand. Multiplying maximum rated wattage by every hour the appliance is plugged in may overestimate the real energy use. Use an average measured draw or reliable annual kWh estimate when available.
What electricity rate should I enter?
Enter the price per kWh that applies to your electricity use. If your bill uses multiple tiers or time-of-use rates, the result is only an estimate unless you calculate and enter a suitable effective rate. The currency selector changes how the cost is displayed; it does not convert between currencies.
Can I estimate several appliances at the same time?
Yes. Add one row for each appliance or group of identical appliances. Enter its wattage, quantity, hours per day and days used per month. The calculator totals their estimated monthly and yearly energy use and cost, and can export the itemized results as a CSV file.
How much does a 1,500-watt appliance cost to run?
If a 1,500-watt appliance draws its rated power for one hour, it uses 1.5 kWh. Multiply 1.5 by your electricity price per kWh to estimate the one-hour energy cost. For example, at $0.15/kWh, that is $0.225, or about $0.23 before any other bill charges. Actual use can differ if the appliance cycles or changes power draw.
Sources and calculation notes
The calculator uses the standard relationship between power, time and energy. The sources below explain the units and the limitations involved in estimating real appliance consumption.
- U.S. Energy Information Administration — Measuring electricity
Explains watts, watt-hours and kilowatt-hours. - Virginia Cooperative Extension — Estimating appliance and home electronic energy use
Provides the wattage × hours ÷ 1,000 method and discusses operating cycles. - U.S. Department of Energy — Energy Saver guide
Provides consumer guidance on appliance energy labels and efficiency.
This free calculator provides estimates for general information. It does not measure electricity, access your utility account, determine electrical safety, or replace your actual bill. Results depend on the accuracy of your inputs and the way each appliance operates.