How AC Electricity Bill is Calculated – Simple Guide
The simplest explanation of AC bill calculation in India

Calculating your AC electricity bill takes 3 steps and 30 seconds. Here's the simplest possible explanation with worked examples for 1T, 1.5T, and 2T ACs. Understanding your AC's electricity cost is the first step to controlling your monthly electricity bill. India has over 120 million AC units installed, with the average household spending ₹8,000–18,000 per year on AC electricity depending on their climate zone, usage hours, and AC star rating.

The formula for calculating AC electricity cost is straightforward: multiply the AC's wattage (in kilowatts) by the number of hours used per day, then by the electricity rate in your state. For a 1.5-ton 5-star inverter AC running 8 hours a day at ₹7 per unit, the monthly cost works out to approximately ₹1,235. The same AC at 14 hours per day (typical for peak summer in Delhi or Ahmedabad) costs ₹2,161 per month.

Star rating makes a dramatic difference. A 5-star inverter AC consumes roughly 57% less electricity than a 1-star fixed-speed AC of the same tonnage. Moving from 3-star to 5-star saves approximately ₹707 per month for a 1.5-ton unit at 8 hours per day. Over a 5-year period, that saving amounts to ₹21,000–42,000 — far exceeding the price premium of a 5-star model.

State electricity tariffs also significantly affect your AC bill. Maharashtra charges ₹8.5 per unit while Odisha charges just ₹5.8 per unit. This 46% rate difference means the same 1.5-ton 5-star AC costs ₹1,500/month in Mumbai versus ₹1,025/month in Bhubaneswar. Knowing your state tariff helps you calculate your exact cost from the data below.