Estimate the extra amount an air conditioner adds to your monthly electricity bill from the units (kWh) it uses and your tariff range.
How to use it. First work out how many units (kWh) the AC will add per month. The simplest route is the BEE label: it states an annual energy consumption in kWh for a standard number of operating hours. Divide that figure by the label's assumed hours to get units per hour, then multiply by your own hours per month. For example, a label showing 900 kWh a year at an assumed 1,600 hours means about 0.56 kWh per hour; at 8 hours a day for 30 days (240 hours) that is about 135 kWh a month. Real use is often higher in a hot top-floor room or at a low thermostat setting.
Formula. Extra bill = units per month × energy charge per unit + other monthly additions. The tool shows a low and a high result using the two rates you enter.
Why a range? Most Indian states use telescopic slab tariffs for homes: the first block of units is charged at a lower rate and later blocks at higher rates. AC units are added on top of your normal use, so they usually fall into your highest slab, not your average one. Look at your bill or your DISCOM's tariff order to see which slab the extra units land in.
Worked example (illustrative). 180 extra units at ₹5–₹8 per unit, plus ₹100 of duty and surcharges, gives roughly ₹1,000–₹1,540 extra per month.
Limits. Tariff slabs, fixed charges, electricity duty and fuel adjustment charges are set state by state and change through tariff orders. The option ranges are illustrative, not current tariffs. Some states also bill bi-monthly, which changes how slabs apply.
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