Appliance electricity cost
Calculate daily, monthly, and annual appliance running costs.
Updated 2026-07-17 · Formula version appears with every result.
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Data confidence
Moderate
Evidence used
Uses rated wattage, quantity, runtime, days used, and your entered electricity rate.
What can vary
Actual draw changes with duty cycle, thermostat behavior, age, and operating conditions.
Planning use
Educational estimate only. Confirm the final design and quotation with qualified professionals.
How this estimate works
Calculations are versioned, reviewed, and reproducible. Inputs are validated and planning ranges are used instead of false precision.
Results support early decisions. Confirm utility rates, equipment specifications, site conditions, and professional requirements before committing money. Review the methodology and source policy before treating any estimate as decision-ready.
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Before using the calculator
What this calculator estimates
Estimate daily, monthly, and annual electricity use and cost from appliance wattage, quantity, hours, days, and rate.
Who it is for
Households comparing appliance use, checking high-consumption loads, or preparing a solar consumption profile.
Inputs and methodology
Monthly kWh equals watts divided by 1,000, multiplied by quantity, hours per day, and days per month. Estimated cost multiplies monthly kWh by the entered electricity rate.
Required inputs
- Measured or rated wattage
- Quantity and hours used per day
- Days used per month and actual electricity rate
Philippine planning assumptions
- Power draw is treated as constant during the entered operating hours.
- Cycling, standby use, inverter modulation, and startup surges are not measured unless reflected in the entered wattage or hours.
Worked example
One 1,000-watt appliance used four hours per day for 30 days consumes about 120 kWh. At ₱11.50/kWh, the simplified monthly estimate is ₱1,380.
How to interpret the result
Use the result to rank appliances and identify where measurement or behavior changes may matter most. It does not prove that the appliance draws its nameplate wattage continuously.
Use the result as a comparison baseline: change one assumption at a time, keep the original inputs, and ask installers to explain why their written estimate differs.
Common mistakes
- Treating nameplate wattage as continuous draw for cycling appliances
- Ignoring quantity, standby use, or changing operating hours
Related questions
Should I use nameplate or measured wattage?
Measured average power is usually more useful when available. Nameplate values are a starting point and may represent maximum or rated conditions.
How can I improve the estimate?
Measure average power and actual runtime over several normal days, then compare the calculated monthly kWh with changes visible on the electricity bill.
Limitations and disclaimer
- The result is an educational planning estimate, not a quotation, site survey, electrical design, or engineering approval.
- Verify current rates, equipment, roof conditions, utility rules, and written installer assumptions before spending.
Last reviewed 2026-07-20