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| Energy Cost Calculator – Calculate Electricity Cost & kWh |
Energy Cost Calculator
This energy cost calculator estimates how much electricity your appliances use and what that usage costs, based on appliance power, hours of use, your electricity rate, and a few optional adjustments. Use it as an electricity cost calculator for a single device or add several appliances to estimate your total electricity usage cost.
- 1. Choose appliance
- 2. Enter power
- 3. Enter usage
- 4. Enter electricity rate
- 5. Calculate
Your monthly estimate uses the number of days you enter for the month. The yearly estimate uses 365 days to provide a standard annual estimate. Because of this, the yearly result may not equal the monthly result × 12, especially when you enter 28, 30, or 31 days for the month.
Appliance Breakdown
| Appliance | Power | Hours/Day | Monthly kWh | Monthly Cost | Yearly Cost |
|---|
How the Energy Cost Calculator Works
This electricity cost calculator works out how much energy an appliance uses by combining its power rating with how long and how often it runs. It then multiplies that energy usage by your electricity rate to estimate a cost. When you add more than one appliance, each one is calculated separately and the totals are added together, so you get an accurate combined electricity usage calculator result rather than a rough guess.
Electricity Cost Formula
Electricity cost = Energy used in kWh × Electricity rate
To calculate energy usage over a month or year, the daily energy figure is simply multiplied by the number of days. For multiple appliances, each item is calculated on its own and then combined into a total. This is how to calculate electricity usage and cost consistently whether you're checking a single appliance or a whole household setup.
Example Calculation
A 1,500W appliance used for 4 hours per day:
1,500 × 4 ÷ 1,000 = 6 kWh/day
At an electricity rate of $0.20/kWh:
6 × $0.20 = $1.20/day
This is only an example. Your own result will depend on the appliance's actual wattage and the electricity rate on your bill.
Common Appliance Power
Actual power consumption varies by model, age, efficiency rating, and how the appliance is used, but this table gives typical ranges to help you get started.
| Appliance | Typical Wattage Range |
|---|
Frequently Asked Questions
How do I calculate electricity usage?
Multiply the appliance's power in watts by the number of hours it runs, then divide by 1000 to get kilowatt-hours (kWh). This gives you the energy used for that period.
How do I calculate the cost of electricity?
Once you know the energy used in kWh, multiply it by your electricity rate per kWh. That gives you the estimated cost for that appliance and time period.
How do you calculate energy consumption?
Energy consumption is calculated by multiplying an appliance's power draw by the hours it's used, then adjusting for quantity and how many days you want to measure over.
How do I calculate electricity cost from watts?
Convert watts to kilowatts by dividing by 1000, multiply by the hours used to get kWh, then multiply that by your electricity rate per kWh.
How do I calculate electricity cost per kWh?
Your cost per kWh is usually shown on your electricity bill as the unit rate. Enter that number directly into the electricity rate field of this calculator.
Does this calculator show my exact electricity bill?
No. It provides an estimate based on the values you enter. Actual bills often include taxes, fixed charges, tiered pricing, and other fees that this calculator does not account for.
This calculator estimates energy usage and electricity cost based on the information you enter. Your actual bill may differ because of taxes, fixed charges, delivery fees, tiered pricing, time-of-use rates, discounts, and other utility charges.