Appliance electricity usage calculator
Add your appliances and set how long they run. You see the energy used in kWh, the daily, monthly and yearly cost, and what costs the most.
Ready-made values for typical appliances. You only change the running time.
Your home
Add rooms first, then the appliances in each of them.
Add a room
Add an appliance
Click an appliance to add it to the list. You can add the same one more than once.
All appliances (32)
Lighting
Electronics
Kitchen
Laundry and cleaning
Heating, cooling, water
Other
Your appliances
The list is empty. Pick an appliance above or add your own.
Price per kWh from your bill: energy plus variable distribution charges, VAT included. 1.00 PLN is an example.
What it costs
Click a part of a chart to see its value and how to read it.
Energy use by room
Where the money goes
Full ranking of appliances
Power versus average draw over the year
The hollow dot is the power while running, the solid dot is the average power over the whole year (yearly energy ÷ 8760 h). The further apart they are, the less the appliance runs. The scale is logarithmic: each mark is 10 times more.
Energy use by day of the week
kWh on each day of the week, averaged over the year.
What it means in practice
Yearly use of the appliances on the list, converted into everyday things.
- —8 W LED bulbs lit for 5 h a day for a year
- —full smartphone charges
- —kettles of 1 l of water brought to the boil
Assumptions behind the comparisons
- An 8 W LED bulb (replaces an old 60 W bulb) lit for 5 h a day uses 14.6 kWh a year.
- A full smartphone charge: about 0.02 kWh (20 Wh) drawn from the socket, charger losses included.
- Boiling 1 l of water from 15 °C: 4.186 kJ/(kg·K) × 1 kg × 85 K ≈ 0.099 kWh; with a kettle efficiency of about 90% ≈ 0.11 kWh.
Share the result
The link holds the appliances, the rooms and the price. This data is not sent to the server.
The result is a simulation prepared with AI help, with no guarantees of any kind. It may contain errors.
Real power in watts, averaged while running, not the nameplate maximum. For heaters: power ≈ 230 V × current in A.
Appliances with a thermostat or a compressor run on and off. Enter how many minutes they run per cycle, how often the cycle repeats and how many hours a day they are switched on.
For example 7 for a heater in the heating season, 3 for air conditioning in summer.
No appliances in this room.
Unless you tick this, the tool saves nothing. Unticking deletes the saved settings.
How to work out the electricity an appliance uses
The meter measures electrical energy in kilowatt-hours (kWh). In everyday speech we call it electricity usage.
energy [kWh] = power [W] × running time [h] ÷ 1000
Example: a 2000 W kettle boils for 10 minutes a day. 2000 × 1/6 ÷ 1000 ≈ 0.33 kWh a day, or about 122 kWh and 122 PLN a year at 1 PLN/kWh.
Formulas for cycles, days of the week and cost
- Duty cycles: running time = minutes on ÷ cycle length × hours switched on per day
- Running days per year = days per week ÷ 7 × 365 × running months ÷ 12
- Cost = energy [kWh] × price of 1 kWh; per month = year ÷ 12, per day = year ÷ 365
- Power is real power in watts (W), because your bill charges for real energy.
How much electricity common appliances use
Typical values the calculator starts from. Your appliance may use more or less.
Show the table (32 appliances)
| Appliance | Power | Typical use | kWh per year | Cost per year at 1.00 PLN/kWh |
|---|---|---|---|---|
| LED bulb | 8 W | 5 h · every day | 14.6 | PLN 15 |
| LED lighting, one room | 30 W | 5 h · every day | 54.8 | PLN 55 |
| LED strip 5 m | 20 W | 4 h · every day | 29.2 | PLN 29 |
| Wi-Fi router | 10 W | 24 h · every day | 87.6 | PLN 88 |
| LED TV 55" | 90 W | 4 h · every day | 131 | PLN 131 |
| Laptop | 30 W | 6 h · every day | 65.7 | PLN 66 |
| Desktop computer | 150 W | 4 h · every day | 219 | PLN 219 |
| Monitor | 25 W | 8 h · every day | 73 | PLN 73 |
| Games console | 180 W | 2 h · every day | 131 | PLN 131 |
| NAS / home server | 25 W | 24 h · every day | 219 | PLN 219 |
| Smartphone charging | 10 W | 2 h · every day | 7.3 | PLN 7 |
| Fridge freezer | 90 W | cycles: 15 min every 45 min · every day | 263 | PLN 263 |
| Freezer | 80 W | cycles: 15 min every 45 min · every day | 234 | PLN 234 |
| Electric kettle | 2,000 W | 10 min · every day | 122 | PLN 122 |
| Electric oven | 2,500 W | 1 h · cycles: 24 min every 60 min · 3 days a week | 156 | PLN 156 |
| Induction hob | 1,500 W | 45 min · every day | 411 | PLN 411 |
| Microwave | 1,200 W | 10 min · every day | 73 | PLN 73 |
| Coffee machine | 1,300 W | 10 min · every day | 79.1 | PLN 79 |
| Dishwasher | 450 W | 2 h · 4 days a week | 188 | PLN 188 |
| Washing machine | 500 W | 1 h 30 min · 3 days a week | 117 | PLN 117 |
| Tumble dryer (heat pump) | 700 W | 2 h 30 min · 2 days a week | 183 | PLN 183 |
| Iron | 2,200 W | 30 min · cycles: 6 min every 12 min · 2 days a week | 57.4 | PLN 57 |
| Vacuum cleaner | 800 W | 15 min · 3 days a week | 31.3 | PLN 31 |
| Hair dryer | 1,800 W | 10 min · every day | 110 | PLN 110 |
| Electric heater 2 kW | 2,000 W | 6 h · cycles: 30 min every 60 min · every day · 7 months a year | 1,278 | PLN 1,278 |
| Electric water heater (boiler) | 2,000 W | 3 h · every day | 2,190 | PLN 2,190 |
| Air conditioner (cooling) | 600 W | 6 h · every day · 3 months a year | 329 | PLN 329 |
| Central heating pump | 25 W | 24 h · every day · 7 months a year | 128 | PLN 128 |
| Hot water circulation pump | 10 W | 8 h · every day | 29.2 | PLN 29 |
| Heat recovery ventilation | 40 W | 24 h · every day | 350 | PLN 350 |
| Aquarium | 40 W | 24 h · every day | 350 | PLN 350 |
| EV charging (7.4 kW wallbox) | 7,400 W | 1 h · every day | 2,701 | PLN 2,701 |
Limits of the result
- The listed values are typical and were compiled with AI help. Your model may use more or less.
- The cost is energy times one price: no fixed charges, no multi-rate tariffs (such as G12), no standby.
- It is an estimate, not a measurement. Do not use it to size fuses or cables.
Frequently asked questions
How do I work out how much electricity an appliance uses?
Multiply the power in watts by the running time in hours and divide by 1000. The result is kWh. The cost is kWh times the price of 1 kWh.
Where do I find the price of 1 kWh?
On your bill: add up the charges billed per kWh (energy and variable distribution charges), VAT included. Leave out the fixed charges.
Why does a fridge use less than its nameplate power suggests?
The compressor runs on and off, only part of the day. The energy label also shows the yearly use in kWh.
What if the nameplate only shows the current in amps?
For heaters and kettles, power ≈ 230 V × current. Motors and power supplies draw less real power than that product; only a measurement gives the exact value.
How do I work out the electricity use of a whole home?
Choose the “Home designer” mode, add rooms and the appliances in each of them. The calculator adds up the use of the home and shows how much energy each room uses.
How accurate is the result?
It is an estimate based on the power and time you enter. A plug-in power meter or an energy meter gives the exact figure.