Appliance Energy Cost
Calculator
Results
- Daily energy (kWh)
- 0.75
- Annual energy (kWh)
- 273.75
- Annual cost
- 46.5375
- Monthly cost
- 3.878125
Energy results
| Daily energy (kWh) | 0.75 |
| Annual energy (kWh) | 273.75 |
| Annual cost | 46.5375 |
| Monthly cost | 3.878125 |
formula-map diagram
- Daily energy (kWh)
- 0.75
- Annual energy (kWh)
- 273.75
- Annual cost
- 46.5375
- Monthly cost
- 3.878125
Energy relationship
Formula
kWh/year = (W × h/day × days/year) ÷ 1000; cost = kWh × price= 0.75
Note
This is a simplified model: it applies the standard equation to the numbers you entered and ignores real-world losses, weather variation, tariff structures and equipment tolerances. Wind power assumes air density 1.225 kg/m³ at ISA sea level and the power coefficient you enter (Betz limit 0.593). Verify with measured data or a professional energy audit before making purchasing decisions.
More in Energy and environment
See all →Frequently asked questions
What inputs do I need for an accurate result?+
You need the appliance's wattage (from its nameplate or a plug-in meter), the average hours you run it per day, and your electricity rate per kWh. Nameplate wattage is often the maximum draw, not the real running average, so a plug-in meter reading is more accurate for devices like fridges or AC units that cycle on and off.
How is the cost actually calculated?+
The calculator converts watts to kilowatts (divide by 1000), multiplies by hours of use to get kWh consumed, then multiplies by your price per kWh. For example, a 1500W heater run for 3 hours uses 4.5 kWh, so at $0.15/kWh that's $0.675 per day.
Why does my utility bill not match this estimate?+
Utility bills include fixed charges, taxes, delivery fees, and sometimes tiered or time-of-use rates that a flat per-kWh estimate doesn't capture. This calculator isolates just the energy cost of one device under constant conditions, so it will differ from your total bill.
Does standby power count toward the daily hours?+
Only if you include it. Many electronics draw a small amount of power even when 'off' but plugged in, so if you want a true daily cost you should add standby hours separately or use a phantom-load calculator for that portion.
How do I estimate wattage if there's no label?+
Check the manual, look up the model number online, or use a plug-in power meter for the most reliable reading. As a rough fallback, multiply the appliance's voltage by its amperage rating, though this gives a maximum rather than typical draw.