Appliance Electricity Cost Calculator

The number printed on the sticker behind your fridge is its maximumdraw — what the compressor pulls while it is actually running. A fridge is plugged in 24 hours a day but its compressor runs only part of that time, switching off whenever the cabinet reaches temperature and back on as it warms. Multiply 180 W by 24 hours by 30 days and you get 129.6 kWh, which at ₹8.25 comes to ₹1,069 a month for one refrigerator. Nobody's fridge costs that.

At a 35% duty cycle — the middle of the range reported for modern units — the same fridge uses 45.4 kWh and costs ₹374. The nameplate calculation overstates it by ₹695 a month, ₹8,340 a year: nearly three times the real figure.

Most appliance calculators sidestep this by asking for "hours per day" and quietly expecting you to enter 8 or 10 for a fridge that is never unplugged. That works arithmetically but it teaches the wrong model, and it falls apart the moment you try to reason about an AC — where the compressor cycling and the fan running are two different things happening in the same six hours. So this calculator asks for both: the hours the appliance is switched on, and the load factor, the share of that on-time it spends at full wattage.

This tool multiplies units by one flat rate. Indian DISCOMs bill domestic supply on telescopic slabs — the first block of units is cheap and later blocks cost progressively more — so there is no single per-unit price to enter. Whatever figure you use is an average, and the average shifts as your consumption does.

On an illustrative ₹4.50 / ₹7.00 / ₹9.00 structure in 100-unit blocks, the default three appliances on this page work out like this:

The effective rate climbs from ₹4.50 to ₹6.85 across the same household, which has a practical consequence people miss: the cost of an additional appliance is charged at your top slab, not your average. If you are already at 300 units, a new geyser running an hour a day adds 36 units billed at ₹9.00 — ₹324, not the ₹297 an average-rate calculation suggests. Marginal decisions should use the marginal rate.

The slab arithmetic and the fixed charges, meter rent, fuel surcharge and electricity duty stacked on top of energy charges are worked through on the electricity bill calculator. If you are settling a sub-metered room rather than estimating your own usage, the meter settlement calculator handles readings and part-month handovers.

There is a way to find your real load factors instead of guessing. Note your meter reading, switch off everything except the one appliance you want to measure, leave it for a couple of hours, and read the meter again. Units consumed divided by hours gives you average kW; divide that by the nameplate kW and you have that appliance's load factor in your home, at that ambient temperature.

The cheaper version: read your meter at the same time on two consecutive days to get actual daily units, then adjust the load factors here until the total matches. Once calibrated, the share column tells you where the money goes.

One structural thing worth knowing before you optimise. Roughly a quarter of India's peak electricity demand now comes from air conditioning, and a 5-star unit uses about 25–30% less power than a 1-star of the same capacity. If your AC dominates the share column and the unit is old and low-rated, the load factor is doing what it can — the appliance itself is the constraint.