Electricity Cost Calculator
Enter appliance power consumption, daily usage hours, and price per kWh. Monthly uses 30.43 avg days; yearly uses 365.25 days.
Energy per day
0.3 kWh
Cost per day
$ 0.04
Energy per month
9.13 kWh
Cost per month
$ 1.37
Energy per year
110 kWh
Cost per year
$ 16.4
Electricity Cost Calculator: How It Works
This tool estimates your appliance energy usage and running cost based on rated power (W or kW), daily usage hours, and electricity price per kilowatt-hour (kWh). Monthly totals use an average of 30.43 days, and yearly totals use 365.25 days.
Formulas
- kW = W × 0.001
- Daily energy (kWh) = Power (kW) × Hours/day × Quantity
- Monthly energy = Daily energy × 30.43
- Yearly energy = Daily energy × 365.25
- Cost = Energy × Price (per kWh)
Notes
- Rated power is printed on the appliance nameplate; it may be in W or kW.
- If the device cycles on/off, enter a realistic average for hours per day.
- 30.43 days/month is an average for display; actual billing cycles may differ.
- Tariffs can be tiered or time-of-use; use your specific price per kWh.
Ways to Reduce Cost
- Prefer high-efficiency appliances (better energy ratings).
- Fully power off devices instead of standby when possible; use smart plugs.
- Reduce runtime: tweak AC/heater setpoints and schedules.
- Switch to efficient lighting (LED) over legacy bulbs.