Calculator KB-13
Electricity Consumption and Cost Calculator
What it costs to run a server, refrigerator, power supply, or heater.
Result
In brief: Calculate an appliance’s electricity consumption from its power and operating time: kWh per day, month, and year, plus the cost at your tariff. Example: Monthly cost: 311.04.
Calculation example
| Appliance power | 100 W |
|---|---|
| Quantity | 1 pcs |
| Hours of operation per day | 24 ч |
| Price per 1 kWh | 4.32 |
| Monthly cost | 311.04 |
|---|---|
| Daily energy consumption | 2.4 kWh |
| Monthly consumption | 72 kWh |
| Annual consumption | 876 kWh |
| Daily cost | 10.37 |
| Annual cost | 3784 |
How it is calculated
Cost = E · rate
Multiply the appliance's power in watts by its operating hours and divide by 1,000 to get the kilowatt-hours shown on your meter. A month is counted as 30 days, a year as 365. The currency is the same as the one used for the rate you enter.
What to look for
- Refrigerators and heaters with thermostats run in cycles: enter the actual compressor or heating element runtime in the hours field.
- It's easier to measure actual consumption with a plug-in wattmeter: the power listed on the label is usually the maximum.
Frequently asked questions
How do I calculate an appliance’s energy consumption?
Multiply the power by the time and divide by 1000. A 100 W appliance running around the clock uses 2.4 kWh per day and 72 kWh in 30 days.
How much does it cost to leave a 10 W device on all year?
That’s 87.6 kWh per year. At a rate of 4.32 UAH per kWh, it costs about 378 UAH.
How can I find an appliance’s actual power consumption?
The most reliable way is to measure it with a plug-in wattmeter: the label gives the maximum, while a refrigerator or pump runs in cycles. For appliances like these, calculate the average power over a day.
