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Electricity Use and Cost Calculator — result sheet
Estimate energy use and electricity cost from appliance power, hours, days, and an entered rate.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Energy per day = watts / 1,000 x hours; period energy = daily energy x days; cost = kWh x entered rate.
Power, time, energy, and price are kept separate so the result does not silently assume a utility tariff or appliance duty cycle.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Power requirement — W; minimum 0; maximum 1000000
- Hours used per day — hours; minimum 0; maximum 24
- Number of days — minimum 1; maximum 366
- Electricity rate — currency/kWh; minimum 0; maximum 100
Worked example
| Input | Value |
|---|---|
| Power requirement | 1000 |
| Hours used per day | 4 |
| Number of days | 30 |
| Electricity rate | 0.15 |
A 1,000 W appliance used 4 hours daily for 30 days uses 120 kWh.
Assumptions and limits
- The entered power remains constant during the selected usage hours.
- Taxes, demand charges, tiered rates, standby power, and utility-specific fees are excluded.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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