Electricity Cost Calculator
Calculate electricity consumption and electricity cost per hour, day, month and year quickly online.
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Use this electricity cost calculator to estimate how much electricity a device, usage pattern or typical household consumption costs per hour, day, month and year. It is especially useful for appliances, space heaters, refrigerators, computers, home office setups, kitchen devices, lighting, electronics and other power consumers.
Electricity Cost Calculator: Lower electricity costs per device, month and year
Use the result as a scenario comparison, not only as a single number. For energy calculators, runtime, price assumptions, efficiency and seasonal effects usually drive the biggest differences.
How to use the result better
- Calculate one realistic and one efficient scenario.
- Compare monthly and annual values so small daily amounts are not underestimated.
- Check inputs against real tariff, consumption or device data.
Common mistake
The most common mistake is an overly optimistic usage profile: runtimes too short, prices too low or missing base costs.
What to check next
If the result is high, compare related calculators for electricity, heating, PV, heat pumps or CO₂ to find the biggest lever.
How exact is the result?
It is a solid estimate when inputs are realistic. Bills may differ because of tariff details, weather, usage and supplier factors.
Why calculate several scenarios?
Scenarios show which input has the strongest impact, and that is usually where optimization should start.
Understand electricity costs
Compare usage, kWh price and appliance costs clearly
The electricity cost calculator shows total costs. For better decisions, also compare price per kWh and individual appliance usage.
Useful electricity calculators
How to use the result
Check the kWh price: Small price differences can matter a lot when yearly usage is high.
Compare appliances: Always-on devices and older appliances often cost more than expected.
How the result is calculated
Daily electricity consumption in kWh = (power in watts ÷ 1000) × usage hours per day
Weekly electricity consumption = daily consumption × usage days per week
Yearly electricity consumption = weekly consumption × 52
Monthly electricity consumption = yearly consumption ÷ 12
Variable electricity cost = electricity consumption × electricity price
Total monthly cost = variable monthly electricity cost + monthly base fee
Total yearly cost = variable yearly cost + monthly base fee × 12
Worked example
Example: A device with 1,500 watts runs 2 hours per day on 7 days per week. This results in daily consumption of 3 kWh, weekly consumption of 21 kWh and annual consumption of about 1,092 kWh. At an electricity price of €0.32 per kWh, variable electricity cost is about €349.44 per year. With an additional monthly base fee of €12, total annual cost is about €493.44.
Calculate electricity cost per hour
To calculate electricity cost per hour, divide the device power in watts by 1000 and multiply it by the electricity price per kWh. A 1000 watt device uses 1 kWh per hour. At €0.32 per kWh, running it costs about €0.32 per hour.
Calculate the electricity cost of an appliance
To calculate the electricity cost of an appliance, you need the wattage, daily usage time, usage days per week and electricity price. Devices such as heaters, washing machines, dryers, gaming PCs or air conditioners can add up quickly.
1000 watt electricity cost example
A 1000 watt device uses 1 kWh when it runs for one hour. If it runs 2 hours per day, it uses about 2 kWh daily. At €0.32 per kWh, that equals about €0.64 per day or around €233 per year before any fixed base fee.
Calculate electricity consumption in kWh
Electricity consumption in kWh is calculated by dividing power in watts by 1000 and multiplying it by usage time in hours. This simple formula helps you compare the energy use of different devices.
Which devices use the most electricity?
Devices with high power and long operating times usually consume the most electricity. Examples include space heaters, electric water heaters, tumble dryers, air conditioners and older refrigerators. The calculator helps identify which devices drive your energy cost.
How much does the base fee matter?
Many users focus only on the variable price per kWh. In practice, the monthly base fee can also matter. Especially with low consumption, a high base fee may account for a noticeable share of total cost. That is why this calculator separates variable cost from total cost.
When is an electricity cost comparison useful?
A comparison is useful whenever devices run regularly or draw a lot of power. Even small differences in wattage, daily usage time or electricity price can add up over a year. This is helpful before buying appliances or identifying power-hungry devices.
How accurate are the results?
The results are intended as realistic estimates. In practice, actual consumption can vary because many devices do not run at full rated power all the time. Real bills also depend on tariff details, price changes, base fees, network charges and the billing period.
Frequently asked questions
How do I calculate electricity cost per hour?
Divide the device power in watts by 1000 and multiply the result by the electricity price per kWh. This gives you the cost per hour.
How much does a 1000 watt device cost per hour?
A 1000 watt device uses 1 kWh when running for one hour. The cost therefore equals the electricity price per kWh.
How do I calculate electricity cost in money terms?
Multiply electricity consumption in kWh by the electricity price per kWh. If there is a monthly base fee, include that as well.
How do I calculate the electricity use of a device?
Divide the power in watts by 1000 and multiply the result by usage time in hours. This gives you electricity consumption in kWh.
How much electricity does a device use per day?
That depends on power and usage time. Power in kW multiplied by daily operating hours gives consumption in kWh per day.
Why is the base fee important in an electricity tariff?
The base fee applies regardless of actual usage. With low consumption, it can make up a surprisingly large share of total cost.
Which inputs have the biggest effect on the result?
The main drivers are device power in watts, daily usage time, usage days per week and the electricity price per kWh. A high monthly base fee can also increase total cost noticeably.
Why is my real electricity bill different from the calculator?
Real consumption may differ, tariffs may include additional details, prices can change and many devices do not run continuously at full power.