Electricity Cost Calculator

Calculate how much an appliance costs to run per day, month and year from its wattage and your price per kWh.

watts
Cost per month
27.00
Energy per day
6 kWh
Cost per day
0.90
Cost per year
328.50
Energy per month
180 kWh

Formula

Energy (kWh) = Watts × Hours ÷ 1000. Cost = Energy × Price per kWh.

About this calculator

Find the wattage on the appliance label and the unit price on your electricity bill. A month is taken as 30 days. Bills with tiered or time-of-use tariffs will differ.

Amounts are shown without a currency symbol, so the calculator works for any currency: enter all values in the same one.

Frequently asked questions

Does an appliance always draw its rated wattage?

No. Fridges, air conditioners and heaters cycle on and off, so their average draw is lower than the label figure.

Related tools

BMI CalculatorCalculate your body mass index (BMI) and see your World Health Organization weight category and healthy weight range. BMR & Calorie CalculatorEstimate your basal metabolic rate (BMR) and daily calorie needs (TDEE) with the Mifflin–St Jeor equation. Age CalculatorCalculate exact age in years, months and days from a date of birth, plus total days and days until the next birthday. Date Difference CalculatorCount the days, weeks, months and weekdays between two dates. Percentage CalculatorCalculate X% of Y, what percent X is of Y, percentage increase or decrease, and add or subtract a percentage. Discount CalculatorCalculate the sale price and how much you save from a percentage discount, with optional sales tax.