Electricity Bill & Appliance Power Cost Calculator
Discover which appliances contribute most to your electricity bill and calculate the cost savings of energy-efficient 5-star appliances.
How it works
Calculates daily kilowatt-hours (kWh or Units) by multiplying appliance wattage by daily usage hours and dividing by 1,000, then applies your regional electricity tariff rate for 30-day and 365-day estimates.
Formula
Daily Units (kWh) = (Watts × Hours / 1000), Monthly Cost = Daily Units × Tariff × 30
Converts watts into kilowatt-hours (units) by multiplying by operating hours and dividing by 1,000, then multiplies by the electricity unit tariff rate.
| Symbol | Variable | Unit | Description |
|---|---|---|---|
| Watts | Power consumption rating | W | |
| Hours | Daily operating time | hours | |
| Tariff | Electricity board rate per kWh | ₹/unit |
Worked example
1,500W Inverter AC running 8 hours/day @ ₹8/unit
- Watts:
- 1,500 W
- Usage:
- 8 hrs/day
- Tariff:
- ₹8/unit
Daily Units = (1500 × 8) / 1000 = 12.00 kWh. Daily Cost = 12 × ₹8 = ₹96. Monthly Bill = ₹96 × 30 = ₹2,880 (360 units/month).
Limitations
Does not include fixed meter charges, municipal electricity duty, or peak-hour Time-of-Day (ToD) surcharges.
Frequently asked questions
What is 1 Unit of electricity in India?
1 Unit of electricity equals 1 Kilowatt-hour (kWh). Running a 1,000-Watt appliance for exactly 1 hour consumes 1 Unit of power.
How do 5-star BEE rated appliances save money?
5-star rated inverter air conditioners and refrigerators consume 20% to 35% less electricity compared to 1-star or 3-star models, recovering the higher purchase price within 18 to 24 months of regular usage.
Why does an inverter AC consume less power than its nominal wattage?
Inverter ACs modulate compressor speed dynamically. Once the room reaches the set temperature, the compressor slows down, consuming as little as 300W to 500W rather than the peak 1,500W.
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Last reviewed: 2026-08-22.