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Electricity consumption calculator

Work out an appliance's energy use in kWh.

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Enter Power (watts), Hours per day, Number of days and the Electricity consumption calculator works out Consumption (kWh) straight away. For instance, with Power (watts) = 2,000, Hours per day = 3 and Number of days = 30 it returns Consumption (kWh) = 180.

How to use it

  1. Enter your values: Power (watts), Hours per day, Number of days.
  2. Read the result instantly: Consumption (kWh).

Frequently asked questions

How does the Electricity consumption calculator work?

It takes Power (watts), Hours per day and Number of days and derives Consumption (kWh) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

3 values: Power (watts), Hours per day and Number of days. Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Power (watts) = 2,000, Hours per day = 3 and Number of days = 30, the calculator returns Consumption (kWh) = 180. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Power (watts) = 4,000, Hours per day = 6 and Number of days = 60 instead, Consumption (kWh) goes from 180 to 1,440 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Power (watts) = 1,000, Hours per day = 2 and Number of days = 15, Consumption (kWh) comes out at 30. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Putting a number on what something costs or feels like: an appliance's share of the bill, a flight's emissions, a household's footprint, or how cold the wind actually makes it.

What is the most common mistake?

Reading a nameplate rating as an average. A 2000 W appliance draws that at full load, not continuously — a fridge rated at 150 W runs a fraction of the hour, so its yearly cost is nowhere near 150 W times 8760.

What is the difference between the Electricity consumption calculator and the Electricity bill calculator?

This one returns Consumption (kWh); the Electricity bill calculator returns Estimated bill. That is the whole difference — open the one whose figure you need.

Where do the figures come from, and how current are they?

The arithmetic is exact for the rating and tariff you enter. Emission factors come from published national inventories and differ by a factor of several between electricity grids, so a footprint is only as local as the factor behind it.

Further reading

All guides →
ExplainerHow Much Electricity Do Appliances Use? Watts, kWh and CostHow watts turn into kilowatt-hours, what typical appliances draw, and how to translate that consumption into a cost on your bill.How-toHow to Estimate Your Electricity BillYour bill is energy used times the price, plus a standing charge. Here's how to work out kWh, what the standing charge is, what uses the most, and how to cut it.ExplainerWhat Is the Heat Index? Why It Feels Hotter Than It IsThe heat index combines air temperature and humidity into a single 'feels-like' number, and explains why a humid 90-degree day can be dangerous.How-toWhat Size Air Conditioner Do I Need?Around 20 BTU per square foot is the starting rule. Here's how to size a unit from your room's area, adjust for sun and use, and why bigger isn't better.How-toHow Much Does an Appliance Cost to Run? A Simple MethodTurn an appliance's wattage and daily hours into an annual running cost using one formula: power times hours times your price per kWh.GuideIs Crypto Mining Profitable? Electricity, Hashrate and DifficultyMining profit is daily revenue minus daily power cost, and the electricity price decides it. Here is the calculation, a break-even table, and the three variables that move against you.