AC Running Cost Calculator
Monthly electricity cost of an air conditioner from capacity, efficiency and duty cycle.
A 1.5-ton 5-star inverter at 8 h/night ≈ ₹1,800–2,500/month at ₹8/kWh. Each star rating step is roughly 8–10% on this bill.
Formula
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
AC Running Cost Calculator is a free ac electricity cost for HVAC designers, technicians and energy auditors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About AC Running Cost Calculator
Monthly electricity cost of an air conditioner from capacity, efficiency and duty cycle. The calculation implements P = capacity(kW)/ISEER × duty; cost = P × hours × 30 × tariff (BEE star-label methodology). A 1.5-ton 5-star inverter at 8 h/night ≈ ₹1,800–2,500/month at ₹8/kWh. Each star rating step is roughly 8–10% on this bill.
How to use AC Running Cost Calculator
- 1Enter AC capacity in TR.
- 2Enter ISEER / EER (5-star inverter ≈ 4.5–5+ · old 3-star ≈ 3.3).
- 3Enter Hours per day in h.
- 4Enter Compressor duty cycle in % (Well-sized inverter on a typical day ≈ 60–80%).
- 5Read Average input power, Monthly cost (30 days) instantly — no submit button needed.
Why use AC Running Cost Calculator?
- ✓Implements the standard formula — P = capacity(kW)/ISEER × duty; cost = P × hours × 30 × tariff
- ✓Reference cited on-page: BEE star-label methodology
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the AC Running Cost Calculator use?+
It computes P = capacity(kW)/ISEER × duty; cost = P × hours × 30 × tariff, per BEE star-label methodology. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
A 1.5-ton 5-star inverter at 8 h/night ≈ ₹1,800–2,500/month at ₹8/kWh. Each star rating step is roughly 8–10% on this bill.
Is this based on ASHRAE methods?+
The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.
Is the AC Running Cost Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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