Calculate how much it consumes and how much it costs to use any device based on its watts, hours, frequency, standby and your electricity price.
Method
01
Convert W to kW and multiply by the time of use.
02
Annualizes the frequency and incorporates the remaining standby.
03
Use the same usage pattern to see which device consumes less energy and costs less.
Your inputs
Compare two devices
The same hours, frequency and electricity price are applied to both devices.
Device A / B
Use the same usage pattern to see which device consumes less energy and costs less.
Power while in use
Check the power rating against the manufacturer label or manual.
Standby power
Check the power rating against the manufacturer label or manual.
Hours per use · Uses per week · Electricity price
The same hours, frequency and electricity price are applied to both devices.
Product or specification page URL
Optional. Works best with public HTML pages; always verify detected values.
Result
Annual comparison
Annual cost
Annual energy
In-use cost
Standby cost
Annual difference
Practical example · Standby power
Hours per use
2 h
Uses per week
7
Electricity price
0.25 €/kWh
How your annual cost is calculated
Two hours per use, seven uses per week. These are example values, separate from your inputs.
Watts (W) measure power; kilowatt-hours (kWh) measure energy. Use a representative average power when a heater or compressor cycles on and off.
The calculation uses 52 weeks and caps active use at 8760 hours per year. Remaining hours count as standby. If you unplug the device, enter 0 W for standby.
The price is multiplied by energy use. This estimate excludes fixed charges and bill items not included in your price per kWh.
A
Active hours per year
728 h
Standby hours per year
8,032 h
Power while in use1,000 W ÷ 1000 × 728 h = 728 kWh
Standby power0 W ÷ 1000 × 8,032 h = 0 kWh
Annual energy728 + 0 = 728 kWh
Annual cost728 kWh × 0.25 €/kWh = €182.00
B
Active hours per year
728 h
Standby hours per year
8,032 h
Power while in use1,000 W ÷ 1000 × 728 h = 728 kWh
Standby power5 W ÷ 1000 × 8,032 h = 40.16 kWh
Annual energy728 + 40.16 = 768.16 kWh
Annual cost768.16 kWh × 0.25 €/kWh = €192.04
Worked example with no standby consumption
Two hours per use, seven uses per week. These are example values, separate from your inputs.
From power to energy1 kW × 2 h × 7 × 52 = 728 kWh→From energy to cost728 kWh × 0.25 €/kWh = €182.00
Responsible scope
Sources and scope
Power and price are user inputs; They are not presented as an energy label or current rate.