How this standby power cost calculator works
Standby cost multiplies idle watts by 24 hours per day, converts watt-hours to kWh, and applies your electricity rate across monthly and annual periods.
How to use it
- Power draw. Enter the value in W.
- Hours used per day. Enter the value in hours.
- Days used per month. Enter the value in days.
- Electricity rate. Enter the value in $/kWh.
- Request the result. Select “Show my result.” No account or email is required.
What to do with the number
Standby draw is usually small per device but can accumulate across always-on electronics, adapters and network equipment over a full year. Measure a group of always-on devices with a smart plug or power meter; very low standby wattages are difficult to estimate from labels alone.
Planning estimate
Use this result as a starting point, not a guarantee. Product specifications, site conditions, manufacturer guidance, local codes, taxes, labor, tolerances, and rounding can change the real requirement or cost.
