Electricity Cost Calculator
How much does running an appliance cost per day, month or year. Set wattage, hours and your electricity rate.
Scan to open on your phone
Point your phone camera at the code to open this tool.
How much does running an appliance cost per day, month or year. Set wattage, hours and your electricity rate.
How to use Electricity Cost Calculator
- Open the toolNo signup and nothing to install; it works as soon as the page loads.
- Set “Wattage (W)”
- Set “Hours per day”
- Set “Rate ($/kWh)”
- Read the resultChange any input and the result is recalculated immediately.
Worked example with the defaults
- MONTHLY COST · 60W for 4h/day × 30 days at $0.15/kWh
- $7.20
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
Electricity Cost Calculator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- Where do I find my rate?
- On your utility bill — usually called "price per kWh" or "supply charge". Around $0.10–0.20 in the US, UK p per kWh in £.