Electricity Cost Calculator
Estimate daily, monthly, and yearly running costs for 50+ household appliances. Compare power consumption and tariff rates.
About
Energy tariffs are rarely transparent, and appliances often run silently, accumulating costs that only become visible on the monthly bill. This tool converts abstract Wattage figures into concrete financial data. By analyzing usage patterns (Hours × Watts), homeowners can identify high-consumption devices-often older refrigerators or space heaters-that disproportionately inflate utility expenses.
Accuracy relies on the Kilowatt-hour (kWh) metric, the universal billing unit for electricity. A small difference in wattage, multiplied over 365 days, results in significant financial deviation. This calculator includes a database of over 50 common appliances to provide realistic baselines when manuals are unavailable.
Formulas
The cost derivation is a linear function of power, time, and tariff rate.
1. Energy Consumption (E):
W × t1000 kWh2. Cost Calculation (C):
Where W is Wattage, t is hours, and Rate is cost per kWh.
Reference Data
| Appliance Category | Typical Wattage (W) | Est. Hours/Day | Est. Cost/Month ($0.15/kWh) |
|---|---|---|---|
| Central AC (3 Ton) | 3500 | 8 | $126.00 |
| Water Heater (Standard) | 4500 | 3 | $60.75 |
| Refrigerator (Modern) | 150 | 24 (Cycle) | $8.10 |
| Space Heater | 1500 | 4 | $27.00 |
| Desktop PC (Gaming) | 400 | 6 | $10.80 |
| LED Bulb (60W equiv) | 10 | 10 | $0.45 |
| Washing Machine | 500 | 1 | $2.25 |
| Electric Oven | 3000 | 1 | $13.50 |
| WiFi Router | 10 | 24 | $1.08 |