TNEB Electricity Bill Calculator

Calculate your Tamil Nadu EB bill online using the latest slab rates

Enter Units Consumed (kWh)

What Is the TNEB Electricity Bill Calculator?

If you live in Tamil Nadu and want to know how much is your electricity bill will be then, this TNEB electricity bill calculator can help you. It uses the latest tariff rates from the Tamil Nadu Electricity Board (TNEB) to give you an accurate estimate based on your usage.

Just enter the number of units you have consumed and get a clear estimate of your total electricity bill, including a detailed cost breakdown. Whether you are a domestic user or want to understand how TNEB charges for household electricity, this calculator gives you a fast and accurate result.

Why Use the TNEB Electricity Bill Calculator?

Many people surprise when they see their electricity bill. This calculator helps:

Helps you avoid surprises in your bill
Gives a breakdown of how many units fall under each slab
Calculates the energy charges as per the TNEB slabs
Estimate your bill before the actual reading arrives
Understand how TNEB charges for different usage levels

Latest TNEB Domestic Tariff Slabs – Effective June 2025

The Tamil Nadu Electricity Board charges domestic users based on a slab system. The rates are updated periodically, where the rate increases as your usage goes up. The latest rates effective from June 2025 are as follows:

Slab	Units	Rate per Unit
< 500 units	0 – 100	Free
	101 – 200	₹2.35
	201 – 400	₹4.70
	401 – 500	₹6.30
Above 500 units	0 – 100	Free
	101 – 400	₹4.70
	401 – 500	₹6.30
	501 – 600	₹8.40
	601 – 800	₹9.45
	801 – 1000	₹10.50
	Above 1000	₹11.55

Note:

The above slab rates are applicable for the bi-monthly billing cycle (usually 60 days).
If your electricity bill covers less than 35 days, TNEB applies monthly slab rates, which are different.
For example, if you consume 650 units in a month, the slab rates will be different than if you consumed the same 650 units over two months.
This calculator uses the bi-monthly slab rates for accurate estimates.

Example: TNEB Electricity Bill Calculation for 650 Units

For example, if you consumed 650 units, your bill would be calculated as follows:

First 100 units → ₹0
Next 300 units (101–400) → 300 × ₹4.70 = ₹1,410
Next 100 units (401–500) → 100 × ₹6.30 = ₹630
Next 100 units (501–600) → 100 × ₹8.40 = ₹840
Next 50 units (601–650) → 50 × ₹9.45 = ₹472.50

Total Bill = ₹0 + ₹1,410 + ₹630 + ₹840 + ₹472.50 = ₹3,352.50

So, your estimated bill for 650 units would be ₹3,352.50. This includes all the energy charges based on the slab rates. You can use this calculator to quickly estimate your bill for any number of units consumed.

Is first 100 units free in Tamil Nadu?

Yes, in Tamil Nadu, the first 100 units of electricity consumed in a billing cycle is free for domestic users. This means that if your total consumption is 100 units or less, you will not be charged anything for those units. If you consume more than 100 units, the charges will apply only to the units exceeding 100.