Calculating how much electricity your devices and household electronics consume can help you figure out how much money you’re spending on them. For that, you have our Electricity Cost Calculator. To determine whether to invest in a more energy-efficient device, use the information below to determine how much electricity an item uses and how much electricity costs.

While you are here, make sure to check our other calculators, such as Average Rate of Change for example.

Units of Electricity

Watts, named after James Watt, the founder of the steam engine, are the units of power used to measure electricity. A watt is the electrical power unit equivalent to one ampere at one-volt pressure.

Electricity Cost Formula

Energy calculations are simple, as any engineer knows. The kilowatt-hour (kWh) is a measure of electrical energy that is calculated by multiplying the power consumption (in kilowatts, kW) by the number of hours spent. The total energy cost is calculated by multiplying that figure by the cost per kWh.

Energy \;cost=\frac {Power_{[W]}} {1000} \times hours \; operating \times cost_{kWh}

How to Calculate Electricity Usage Costs?

Multiply the device power (kW or W) by the number of hours you use to get the energy consumption (kWh).

For example, if you use a 1500 W vacuum cleaner for 1 hour every day, you will consume 1500 Wh or 1.5 kWh per day. The cost of use for one month is 1.5 kWh times 30 days times 0.40$ per kWh equals to $18.

Electricity Cost Calculator – How to Use?

It’s quite straightforward. Firstly, the calculator will display how much power you consume every day and compute the correct annual price for electricity if you know the value for energy usage, energy price, and usage time.

You can also alter the units whenever you like (for example, change days to months or watts to kilowatts). Besides calculating the annual electricity cost, you can obtain daily, weekly or monthly cost as well.

Electricity Cost Calculator – Example

Let’s pretend you use your 1000 Watt iron twice a week for half an hour each time, for a total of an hour per week. It works out to 1000 Wh (1 kWh) per week or 52 kWh per year. So your hoover will cost you $6.76 per year at the same $0.13 per kWh electricity rate.

Enter these values in our calculator and check the results.


How do you calculate electricity cost per kWh?

To determine the kWh for a certain appliance, multiply the wattage (watts) by the number of hours (hrs) you use the device and divide by 1000.

How much is 1000 kWh monthly?

A typical American home is 2,300 square feet and consumes roughly 1,000 kWh of electricity each month. On average, power costs 10 cents per kWh (but can be slightly higher and a little bit lower, depending on the state).

Is 2000 kWh a month a lot?

According to our research, many plans promoted at relatively competitive 2000 kWh pricing wind up costing more than 35 percent more for users at the 500 kWh usage level. In short, it is too much!

How much electricity does a 3 bedroom house use?

For a three-bedroom house, it is usually used 3,100 kWh of electricity.

How do I reduce my electricity costs?

The easiest method to start saving money on your electricity bills is changing how you use it. Depending on various circumstances, including the size of your home, making these few no-cost adjustments in your home might save you a lot of money per year.