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. Add your email, then select “Email & show my result.”
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.