Standby Power Annual Cost Calculator
Calculate each device and totals, then compare your chosen reduced standby scenario.
A QUICK WALKTHROUGH
How to use this tool
- Enter 1–100 labeled devices and an explicit energy tariff.
- Calculate and review every row.
- Copy the report or download TXT.
Formula and units
Power W = input power × unit factor × quantity. kWh/day = W×hours/day÷1000; kWh/year = daily×days/year. Cost = annual kWh×price/kWh. Savings = baseline−scenario.
Scope and assumptions
Power units: W, kW, mW. Tariff units: currency/kWh or currency/MWh. Quantity is a nonnegative integer; hours 0–24; days 0–366. Blank scenario quantity/hours retain baseline. Nameplate and measured standby power may differ from actual use. No assumed device classes or loads. DOE: https://www.energy.gov/energysaver/articles/3-easy-tips-reduce-your-standby-power-loads
Local processing
Inputs remain in this browser. Copy and TXT use the same fixed full precision report.
GOOD TO KNOW
Common questions
What does this result mean?
It is arithmetic from your measurements and explicit assumptions, not a prediction of real performance.