Electricity Cost Calculator

Appliance power, W

Hours per day

Days per month

Tariff per kWh

Result

kWh per day6
kWh per month180
kWh per year2,160
Cost per day$36.00
Cost per month$1,080.00
Cost per year$12,960.00

Watts, hours and your tariff

Consumption in kilowatt-hours and in money per day, month and year from an appliance's rating and running time.

Working out what is actually driving the meter comes down to power and running time. A kilowatt-hour is a thousand watts for one hour, so a 2 kW heater burns eight of them in four hours — the same eight a 10 W bulb takes eight hundred hours to use.

The expensive appliances in any home are the ones that produce heat: heaters, water heaters, ovens, kettles. Everything that merely lights or computes is negligible beside them, however many devices you leave on.

What this calculator shows

Consumption per day, month and year in kilowatt-hours
The same periods in money at your tariff
The annual figure, which is the fair way to compare appliances

What to keep in mind

The rated power from the label is used; thermostat-controlled appliances cycle on and off and use less.
Enter your own tariff — it varies by region, by whether the home has an electric hob, and by time of day on a dual-rate meter.

FAQs

What is a kilowatt-hour?

The energy a one-kilowatt appliance uses in an hour. It is exactly what the meter counts, and the tariff is its price.

How much does a fridge use?

It is rated at 100-200 W but the compressor runs perhaps a third of the time, so 30-50 kWh a month — a few hundred roubles.

Does standby power really matter?

A little, but constantly: 1-3 W per device. A dozen of them add up to around 200 kWh a year.

Is a dual-rate meter worth it?

If a real share of your usage is at night — laundry, dishwasher, water heater, EV charging. The night rate is usually half the day rate, though the day rate is slightly higher than a single tariff.

Worked example

A 1.5 kW heater

Input: 1500 W, 4 hours a day, 30 days, 6 ₽/kWh

Output: 180 kWh a month, 1,080 ₽

Note: Over a six-month heating season that is about 6,500 ₽ from a single heater — which is why electric heating has the reputation it does.

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