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Understand your
electricity bill.
Your units. Your appliances. A clear estimate of your next two-month bill, with every slab explained.
Rates as per TNPDCL, October 2026Start with your usage
01 / INPUTWhere does it come from?
Common Tamil Nadu home starting estimates. Hours, watts and compressor use vary by home. Edit the details below.
Units behind your bill
Most likely units / 2 months
- Whole units that match
- Before unit rounding
For your two-month billing cycle
Where your bill comes from
| Units | Rate / unit | Amount |
|---|
The two-month total is rounded to whole units (0.5 upward). The final bill is rounded to the nearest rupee.
Domestic LT I-A estimate. Excludes arrears, deposits and late-payment charges.
A smaller bill starts here
Above 500 units, the free allowance falls from 200 to 100 units. The extra cost includes units 101–200.
Which appliances use the most?
Costs are shares of the total bill, allocated by energy use. They are not separate appliance bills.
Make sense of your usage
Tariff slabs ↗How much does your AC cost to run?
Start with electrical input watts. Cooling capacity in tons is not electrical power.
02Your fridge’s electricity use, explained.
A fridge stays switched on all day. Its compressor does not run at full power all day.
03What does your water pump use?
Convert horsepower to watts, then account for the time your motor actually runs.
A few useful answers
Are the first 200 units always free?
Only when total two-month use is 500 units or less. Above 500 units, the first 100 units are free.
Why is 501 units much more expensive than 500?
Crossing 500 makes units 101–200 payable at Rs. 4.70 each, in addition to the new unit. The bill rises from Rs. 1,570 to Rs. 2,048.
Can I enter one month’s usage?
Yes. Select one month. We double your units to estimate a two-month bill. Your monthly budget is half that bill.
How do I get a better appliance estimate?
Use input watts from your appliance label and realistic running hours. For a fridge or AC, adjust compressor on-time, or use BEE annual kWh.
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