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Calculate your AC electricity bill, find the right AC tonnage for your room, compare AC vs cooler costs and track appliance power consumption — save money on every unit.

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AC Size Calculator
Find the right AC tonnage for your room. Based on room area, ceiling height, sunlight exposure, insulation quality and number of occupants.
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Why calculate your AC electricity cost?

An air conditioner is typically the single largest energy consumer in an Indian home — accounting for 40–60% of the summer electricity bill. Our AC cost calculator shows you the exact rupee impact of tonnage, star rating, usage hours and your state's electricity rate.

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How to choose the right AC tonnage

Buying an AC that's too small means it never cools efficiently. Too large and it short-cycles — wasting electricity and leaving rooms humid. The right size depends on room area, ceiling height, sunlight exposure, insulation and how many people use the space.

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AC vs air cooler — which is cheaper?

An air cooler consumes 80–90% less electricity than an AC, but only works effectively in low-humidity climates. In dry regions like Delhi or Rajasthan, a cooler can cost ₹100–200 per month versus ₹1,500–3,000 for an AC. Our comparison calculator gives you the real personalised difference.

FAQ

Energy calculator questions

Common questions about AC costs, sizing and energy saving.

A 1.5-ton AC typically uses between 1.2 and 2.2 units (kWh) per hour depending on its BEE star rating. A 5-star model uses around 1.4 units/hr, while a 2-star or older AC can use up to 2.2 units/hr. At ₹8/unit, that's ₹11.20 vs ₹17.60 per hour — a significant difference over a season.
The Bureau of Energy Efficiency (BEE) recommends setting your AC to 24°C. For every 1°C you lower the set temperature below 24°C, your AC uses approximately 6% more electricity. Running at 18°C instead of 24°C costs about 36% more. Use a fan alongside the AC at 24°C for the most efficient cooling.
Monthly cost = (AC wattage / 1000) × hours used per day × days per month × your electricity rate (₹/unit). For a 1.5T 5-star AC running 8 hrs/day for 30 days at ₹7/unit: 1.5 × 8 × 30 × 7 = ₹2,520. Our AC Electricity Cost Calculator handles this automatically with star-rating adjustments.
Generally yes — 1.5 ton is suitable for rooms of 120–180 sq ft under standard conditions. However, if the room gets heavy direct sunlight, has high ceilings, poor insulation, or is on the top floor, you may need 2 tons. Use the AC Size Calculator above for a recommendation specific to your room's conditions.
A desert air cooler uses roughly 150–250 watts, compared to 1,200–2,200 watts for a 1.5T AC. At 8 hours/day for 30 days at ₹7/unit, a cooler costs ₹250–420 per month vs ₹2,016–3,696 for an AC. The savings are significant, but coolers are only effective in dry climates (below 50–60% humidity).
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