Select a preset above and click Add to list.
* Calculations assume 100% duty cycle. Real-world results may vary ±5–10%.
How to use this energy consumption calculator
This free online calculator helps homeowners, engineers, and solar system designers estimate how much electricity their appliances consume. Select an appliance preset (or enter custom wattage), set the quantity and daily hours of use, then add it to your list. Build a complete load profile for your home, office, or industrial site — then read off your daily, monthly, and yearly kWh totals instantly.
- 1Click a preset appliance card, or choose “Custom entry” to enter your own wattage.
- 2Set the quantity (e.g. 3 ceiling fans) and drag the hours/day slider.
- 3Click Add to list. Repeat for every appliance in your home or facility.
- 4Read the live totals — daily, monthly, and yearly kWh — from the analytics panel.
- 5Multiply monthly kWh by your utility rate (e.g. Rs. 50/kWh) to estimate your electricity bill.
What is a kWh?
A kilowatt-hour (kWh) is the standard unit of electrical energy. It equals running a 1,000-watt appliance for exactly one hour. Your electricity bill is measured in kWh — so understanding which appliances consume the most kWh is the first step to reducing your electricity costs or correctly sizing a solar panel system.
Formula: kWh = (Watts × Hours) ÷ 1,000
Common appliance wattages — reference guide
Use the table below as a starting point. Always check your appliance’s nameplate or energy label for the exact wattage figure.
| Appliance | Typical range | Preset value |
|---|---|---|
| Inverter AC (1 ton) | 700 – 1,100 W | 900 W |
| Refrigerator / Smart Fridge | 100 – 400 W | 250 W |
| Ceiling Fan | 50 – 100 W | 80 W |
| LED Panel Light | 10 – 25 W | 15 W |
| Electric Iron | 1,000 – 2,000 W | 1,200 W |
| Washing Machine | 500 – 2,500 W | 2,000 W |
| Water Heater (Geyser) | 1,000 – 3,000 W | 1,500 W |
| Desktop PC + Monitor | 100 – 300 W | 150 W |
| Laptop | 30 – 90 W | 65 W |
| LED TV (43″) | 60 – 150 W | 100 W |
| Microwave Oven | 600 – 1,200 W | 750 W |
Why use this calculator?
Understanding your home’s energy consumption helps you make smarter decisions: reducing your electricity bill, choosing energy-efficient appliances, sizing an inverter or solar system, or identifying energy-hungry devices. Unlike single-appliance calculators, this tool lets you build a complete load profile with multiple appliances, quantities, and different daily usage patterns — giving a realistic picture of your total electricity demand.
