Electricity Cost Calculator (Watts/kWh to Dollar Cost)
Home budgeting, identifying high-energy-cost appliances. Calculates running cost per hour, per day, per month, and per year from appliance wattage and local electricity rate ($/kWh), featuring pre-loaded US State and international electricity rates.
Step-by-Step Derivation ▼ Show Steps
Calculations adhere to standard electrical engineering physics and National Electrical Code (NFPA 70) regulations.
Engineering Principles & Calculations
This calculator uses the exact mathematical relationships between Device Power (Watts / kW), Daily Operating Hours (hrs/day), Utility Rate ($/kWh - default $0.16/kWh) to determine Cost per Hour, Cost per Day, Cost per Month, Cost per Year ($). In practical installations, factors such as ambient raceway temperature, harmonic distortion, duty cycle continuous operation, and conductor impedance must be accounted for by a certified electrician.
Calculates running cost per hour, per day, per month, and per year from appliance wattage and local electricity rate ($/kWh), featuring pre-loaded US State and international electricity rates.
Typical Application & Industry Guidelines
Home budgeting, identifying high-energy-cost appliances.
Electricity Cost Calculator (Watts/kWh to Dollar Cost) Benchmark Lookup Table
| Device & Wattage | Daily Runtime | Monthly kWh | Monthly Cost @ .16/kWh |
|---|---|---|---|
| 60W Equivalent LED Bulb (9W) | 6 Hours / Day | 1.6 kWh | .26 / month |
| Desktop Gaming PC (400W) | 6 Hours / Day | 72.0 kWh | .52 / month |
| Refrigerator (150W avg cycle) | 24 Hours / Day | 108.0 kWh | .28 / month |
| Space Heater 1500W | 8 Hours / Day | 360.0 kWh | .60 / month |
| Central Air Conditioner (3500W) | 8 Hours / Day | 840.0 kWh | .40 / month |