Appliance Standby Electricity Cost Calculator
Estimate the energy and cost associated with equipment left in standby for the hours entered.
How to use this calculator
- Enter standby power (watts), standby hours per day, days used per year and the remaining stated inputs; keep their units consistent.
- Review the result and intermediate values; change one input at a time when comparing scenarios.
- Keep the stated formula and assumptions with any result you share.
Formula and method
Annual kWh = standby watts × hours per day × days per year ÷ 1,000. Annual cost = annual kWh × electricity price per kWh.
- It uses about 23.36 kWh and costs about €7.48 per year.
- Actual standby power may vary by device mode and network activity. A wattmeter measurement is more reliable than a label estimate.
Worked examples
Worked example
A 3.2 W device stays in standby for 20 hours/day at €0.32/kWh for 365 days.
It uses about 23.36 kWh and costs about €7.48 per year.
It uses about 23.36 kWh and costs about €7.48 per year.
Understanding the result
It uses about 23.36 kWh and costs about €7.48 per year.
Actual standby power may vary by device mode and network activity. A wattmeter measurement is more reliable than a label estimate.
Important notes
Actual standby power may vary by device mode and network activity. A wattmeter measurement is more reliable than a label estimate.
Use measured inputs and verify that the model matches the situation before making an operational, financial or technical decision.
Frequently asked questions
Does the estimate include active use?
No; it covers only the standby hours you enter.
Why can measured cost differ?
Tariffs, taxes, fixed fees and standby power can differ from the assumptions.
What should I check before relying on this result?
Verify units, input definitions and assumptions against your real data or the relevant product, service or professional guidance.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.