Tech calculator
Device Electricity Cost Calculator
Turn device wattage and usage time into energy and cost estimates.
Monthly cost
$3.6
How the device electricity cost calculator works
Estimate a device's daily, monthly, and annual electricity use and cost.
A 100 W device used 8 hours daily for 30 days consumes 24 kWh and costs $3.60 at $0.15/kWh.
Assumptions and limitations
The estimate assumes constant power draw and the same schedule each month; standby use and tiered utility rates are excluded.
Inputs and results stay in your browser. Blank, invalid, or mathematically undefined inputs show a clean placeholder instead of a broken number.
Practical use
Use this tech calculator to explore scenarios quickly, then verify important decisions against the original source data or requirements.
Frequently asked questions
Does the device electricity cost calculator send my data anywhere?
No. It runs client-side in your browser and makes no network requests.
Why is the result blank or shown as a dash?
One or more inputs are blank, outside the accepted range, or would make the calculation undefined. Check the labels and enter finite values.
Can I use decimal values?
Yes, where decimals are meaningful. Counts that represent whole items may require integers.