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Electricity Usage and Cost Calculator
Estimate appliance energy use and cost over a supplied operating schedule.
Operating power (W), Hours used per day, Number of days, Operating duty (%), Price per kWh
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the labelled values and use the displayed units.
- Choose Calculate result and inspect the full report, assumptions and undefined/no-solution status.
- Choose Download result to save the complete JSON. Reset clears results and restores the example controls.
Examples
Operating power (W): 1000
Hours used per day: 3
Number of days: 30
Operating duty (%): 100
Price per kWh: 0.3
Limitations
- Power watts; hours/day 0–24; whole days 0–36600; duty percentage 0–100. Flat user-supplied price/kWh only; no tariff lookup, tiered bill, standby loads or measured energy guarantee.
- Scalar numeric inputs use explicit decimal syntax and IEEE-754 arithmetic; unless a tighter bound is stated, positive values are 1e-12–1e12 and nonnegative values 0–1e12. Derived inventory counts above 1 billion and nonfinite results are refused. Combined input limit400,000 UTF-8 bytes;complete JSON output limit4MiB. Numeric/code input controls allow128 characters. All processing stays in your browser.
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