Track watts, hours, quantity, and energy use quickly. Review monthly totals, costs, and standby waste. See clearer appliance trends before bills become expensive surprises.
Main page sections stay single column, while appliance cards use responsive columns.
Base watts from direct entry: W = Rated Watts
Base watts from electrical entry: W = Volts × Amps × Power Factor
Effective running watts: Effective Watts = Base Watts × Load Factor
Daily running energy: Daily Running kWh = (Effective Watts × Quantity × Hours per Day) ÷ 1000
Daily standby energy: Daily Standby kWh = (Standby Watts × Quantity × Off Hours) ÷ 1000
Monthly energy: Monthly kWh = (Daily Running kWh + Daily Standby kWh) × Days per Month
Monthly cost: Energy Cost = Monthly kWh × Tariff per kWh
Final bill estimate: (Energy Cost + Fixed Charge) × (1 + Tax Rate ÷ 100)
| Appliance | Mode | Input Value | Qty | Hours/Day | Days/Month | Standby W | Load Factor | Estimated Monthly kWh |
|---|---|---|---|---|---|---|---|---|
| Air Conditioner | Direct | 1500 W | 1 | 8 | 30 | 20 | 0.85 | 315.60 |
| LED Bulbs | Direct | 12 W | 8 | 5 | 30 | 0 | 1.00 | 14.40 |
| Refrigerator | Electrical | 230 V × 1.2 A × 0.90 | 1 | 24 | 30 | 0 | 0.45 | 80.48 |
| Router | Direct | 10 W | 1 | 24 | 30 | 0 | 1.00 | 7.20 |
| Washing Machine | Direct | 500 W | 1 | 1 | 20 | 2 | 0.90 | 9.92 |
kWh means kilowatt-hour. It measures energy consumed over time. A 1000 watt device running for one hour uses 1 kWh.
Many devices still draw power while idle. Standby energy can add noticeable monthly usage, especially for routers, TVs, chargers, and always-connected appliances.
Load factor adjusts rated watts to a more realistic operating level. Motors, compressors, and thermostatically controlled devices often run below their maximum rating.
Yes. Switch the input mode to electrical entry. The calculator estimates watts using volts, amps, and power factor.
Results are estimates. Accuracy improves when you use measured values from labels, smart plugs, meters, or utility bills instead of rough assumptions.
Yes. The final bill estimate adds your fixed monthly charge and then applies the entered tax rate on the subtotal.
Quantity multiplies the energy impact of identical devices. This is useful for bulbs, fans, monitors, chargers, and office equipment.
Yes. It highlights the biggest energy users, standby waste, and cost drivers. That makes it easier to adjust schedules, replace inefficient appliances, and plan savings.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.