Appliance Electricity Cost Calculator
Estimate daily, average monthly and annual appliance running costs using watts and load, energy-label kWh or measured consumption. Compare flat rates with your own peak/off-peak energy allocation for up to 10 appliances.
Enter appliance usage
Use the appliance label, a specification sheet, or measured average watts when available.
Changing region updates the USD or CAD labels; it does not convert your entered rate or results.
⚡ Electricity rate
USD/kWh🔌 Appliances
Appliance 1
Up to ten appliances can be compared.
🧮 Compare against flat-rate pricing
Important: Estimated Results Only: This calculator provides estimates of appliance electricity consumption and running costs, not exact utility bill amounts. Actual energy use and costs may vary based on appliance efficiency, operating conditions, usage patterns, electricity rate schedules, and additional utility charges. For a more reliable estimate, use energy consumption data from your appliance's energy label, electricity meter, or energy monitoring device. Results are intended for general planning and comparison purposes only.
Quick answer
Running cost is energy in kWh multiplied by your electricity price. Power and runtime provide an estimate; energy labels or measured kWh can better represent cycling appliances.
How to use the calculator
1. Choose power, energy-label kWh or measured kWh, and specify the unit and period or measured duration.
2. In power mode enter hours per use day, days per week and load percentage. Add standby watts and hours without overlapping running time.
3. Enter a flat price or 2–4 TOU band prices and your energy shares totaling 100%. Unknown timing is not inferred.
4. Add appliances separately and choose USD or CAD without conversion. Optionally compare flat pricing or reduced consumption.
Appliance running cost formula
Watts to kWh: Running kWh = kW × operating hours × load factor; standby kWh = standby W ÷ 1,000 × standby hours. Power mode weights use-day durations by days per week ÷ 7 for daily averages.
Running cost: Flat cost = kWh × price. TOU cost = total kWh × the sum of each band's energy share multiplied by its price. Peak/off-peak shares must be supplied by you.
Average month: Annual estimate = average daily energy or cost × 365. Average month = annual estimate ÷ 12, or 365/12 days. Labels and measured periods use the same convention.
Worked example
Hypothetical illustration, not typical year-round heater use: a 1500 W heater at 100% load runs 4 hours/day, 7 days/week, at an example USD 0.20/kWh. It uses 1.5 kWh per operating hour (USD 0.30/hour), 6 kWh per day (USD 1.20/day), and 2,190 kWh over 365 days (USD 438.00/year; USD 36.50 per average month). Daily operation throughout the year is assumed only to demonstrate the formula; enter your actual use days.
Average monthly cost
$36.50
Annual cost
$438.00
When this estimate is useful
- • Space heater electricity cost per month: adjust a 1500 W heater's actual hours and use days, rather than assuming daily use all year.
- • Refrigerator electricity cost per month: use annual energy-label kWh or measured kWh. Rated watts × 24 hours can misrepresent compressor cycling.
- • Air conditioner electricity cost per hour: use measured average power or an explicitly chosen load factor. Nameplate watts do not establish compressor duty cycles.
- • Standby devices: enter TV, console or computer standby watts and hours separately in power mode; do not double-count running time.
Important limits
- • Energy-only estimates are not exact bills. Delivery, fixed charges, demand charges, taxes and credits are excluded.
- • Label kWh represents total consumption under the label conditions; measured kWh represents its measured period. These modes do not automatically add standby again.
- • Refrigerators and variable-load AC units cycle. Prefer label or measured data where available; a power-mode load percentage is your assumption, not an inferred duty cycle.
- • This interface uses 2–4 user-specified TOU energy shares. Weekday/weekend time windows, midnight-crossing intervals and seasonal tariff calendars are not configured.
- • A normal year is 365 days and an average month is 365/12 days. Results are planning averages, not a particular month's bill or a forecast of actual use.
Source: Virginia Cooperative Extension — appliance energy-use method
Frequently asked questions
How do I calculate appliance electricity cost from watts?
Divide W by 1,000 for kW, then estimate running kWh from operating hours and load factor. Add standby kWh in power mode when needed, and apply your flat price or supplied TOU shares.
What is the difference between watts, kW, and kWh?
Watts and kW measure power; 1,000 W equals 1 kW. kWh measures energy over time: power in kW multiplied by hours.
What does ‘hours per use day’ mean?
It is the number of hours the appliance runs on a day when you use it. Enter use days separately under days per week.
Where can I find my electricity rate?
Use your utility's energy price per kWh. For peak vs off-peak electricity cost, enter 2–4 prices and your own energy shares totaling 100%. This is proportional allocation, not an hourly or seasonal schedule.
Can the electricity rate be zero?
Yes. A zero rate keeps energy results available while cost results remain zero; it does not offset other utility charges.
Is nameplate wattage accurate for cycling appliances?
Not always. Refrigerators and AC units may cycle or vary their load. Energy-label kWh or measured consumption can be more useful than nameplate watts, which do not reveal actual duty cycles.
How is the average monthly cost calculated?
Average daily energy or cost × 365 gives the annual estimate; divide by 12 for an average month of 365/12 days. It is not a specific billing month.
Can I calculate several identical appliances at once?
Yes. Add each appliance separately, up to 10 appliances; estimates are calculated per appliance and then summed.
How much does it cost to run an appliance for one hour?
At a selected flat price, operating-hour cost = kW × load factor × price per kWh. A hypothetical 1500 W heater at full load and USD 0.20/kWh uses 1.5 kWh and costs USD 0.30/hour. A TOU hour depends on the applicable band; percentage shares do not reveal clock time.
Does this match my final utility bill exactly?
No. This estimates energy charges only. Actual bills can include delivery, fixed or demand charges, taxes and credits, while actual use may differ. Use your own rates and label or measured data where available.