Electricity Cost Calculator

What is the Electricity Cost Calculator?

Calculate how much an appliance costs to run per day, month and year. Multiplying an appliance’s wattage by hours of use and your electricity rate shows what it really adds to your bill each month and year.

How to use the Electricity Cost Calculator

1. Enter your power rating, your hours used per day, your electricity price.
2. Results update automatically as you type; you can also press Calculate.
3. Read the output: cost per month, cost per day, cost per year, energy per month.
4. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

Worked example

With power rating = 1,500 watts, hours used per day = 3, electricity price = 0.16 $/kWh, the Electricity Cost Calculator returns cost per month: $21.60; cost per day: $0.72; cost per year: $262.80.

Where the Electricity Cost Calculator helps in real life

You run a 1,500-watt space heater in your home office for six hours on winter days. Entering your rate shows the monthly cost, which you can compare with turning the central heating up instead.

Your old garage freezer still works but feels expensive. Estimating its yearly running cost against a modern efficient model shows how many years a replacement would take to pay for itself.

Common mistakes to avoid

• Using the maximum wattage for devices that cycle on and off, like fridges.
• Ignoring standby power from devices left plugged in.
• Using an out-of-date electricity price.
• Forgetting time-of-use rates that change by hour.

💡 Practical tip: Heating, cooling and water heating usually account for the largest share of household electricity use.

Tips for better results

• Find the exact price per kWh on your latest bill, including delivery charges.
• Measure real usage with a plug-in energy monitor for cycling appliances.
• Compare yearly costs, where small differences become clear.

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