1.5 ton AC electricity cost for 8 hours
Estimate the electricity units and energy charge for a 1.5 ton AC used for eight hours, using its actual input power and the rate on your own bill.
Start with input power, not tonnage
A 1.5 ton label describes cooling capacity, not the exact electricity drawn from the meter. Find rated input power in watts or kilowatts on the appliance label, BEE label or product sheet. Inverter AC draw can vary as the room load changes.
Use the eight-hour calculation
Energy for one day = input power in kW × operating hours. Multiply by the days you use the AC. If the compressor cycles, use a realistic operating factor instead of treating every hour as full load.
Estimate only the energy charge
Energy charge = estimated units × your own per-unit rate. Slabs, fixed charges, duties, fuel adjustments, taxes or subsidies can change the final bill, so an energy-charge estimate is not a promised bill amount.
Check it against the meter
Compare the estimate with a normal week of readings under similar weather and use. Adjust the operating factor from evidence instead of assuming a published example matches every room.