Master Electricity Bill Calculator:
Take Control of Your Energy Costs

Indian electricity billing uses a progressive slab system. The first X units are charged at a lower rate, the next Y units at a higher rate, and so on. Crucially, in most states, crossing a slab threshold reprices ALL units at the new rate — not just the units above the threshold. This is why adding an AC can dramatically increase your total bill.

Fixed charges (also called demand charges or meter rent) are a flat monthly fee you pay regardless of how much electricity you use. They range from ₹40/month (Tamil Nadu) to ₹130/month (Maharashtra). They cover the cost of maintaining the distribution infrastructure to your home.

FPPCA (Fuel and Power Purchase Cost Adjustment) is a variable surcharge that adjusts for fluctuations in the cost of fuel used to generate electricity. When coal or gas prices rise, FPPCA increases. It's typically ₹0.25–₹0.80/unit and is recalculated quarterly by the state electricity regulator.

Yes, significantly. Every 1°C increase in thermostat setting saves approximately 3–5% on AC electricity consumption. Setting 24°C instead of 18°C (a 6°C difference) saves 18–30% on your AC bill. The BEE recommends 24°C as the optimal balance between comfort and efficiency.

Yes, but very little. A mobile charger left plugged in (without a phone) draws about 0.1–0.5W in standby. Over a year, this adds less than ₹20 to your bill. However, larger devices like set-top boxes (15W standby) and WiFi routers (8W continuous) add ₹500–₹1,000/year in phantom loads.

A 2kW storage geyser running 1 hour/day adds 60 units/month. If this pushes your total consumption across a slab boundary, ALL your units get repriced at the higher rate. For example, in Maharashtra, crossing 300 units moves you from ₹8.20 to ₹10.60/unit — a 29% rate increase on your entire bill.

Yes, substantially. A 1.5T 5-star inverter AC uses 900–1,400W (variable) vs a 3-star fixed-speed AC at 1,800W (constant). Over 8 hours/day for 30 days, the inverter uses ~120–168 units vs the fixed-speed's 216 units — saving 48–96 units/month, worth ₹400–₹1,000 depending on your state's slab rates.