Electricity Bill Analyser
Break your bill into slab charges, fixed charges and duties, and see the true cost of your next unit.
Result
- Energy charge
- ₹2,840
- Fixed charge
- ₹550
- Electricity duty
- ₹256
- Estimated total bill
- ₹3,646
- Average rate per unit
- ₹8.68
- Marginal rate — cost of your next unit
- ₹10.36
Estimates only. Nothing you type is stored or sent anywhere — the calculation runs entirely in your browser.
How this works
Most people assume their electricity costs one rate per unit. In India it almost never does. Domestic tariffs are slabbed, so the first 100 units are cheap and the last 100 are expensive, and a fixed charge based on sanctioned load sits on top regardless of how little you use. Electricity duty is then levied as a percentage on the energy charge.
The number that actually matters for any efficiency decision is your marginal rate — what the next unit costs, not what your average unit costs. If you are in a high slab, replacing an old air conditioner or adding solar saves you at the marginal rate, which can be 60–80% higher than the average rate printed at the bottom of your bill.
Slab boundaries and rates vary by state and are revised by state electricity regulatory commissions, usually annually. The defaults here approximate a typical urban domestic tariff; adjust them to your own DISCOM's published tariff order for an exact figure.
Common questions
- What is the fixed charge for?
- It covers the utility's cost of maintaining a connection and network capacity for you, and is charged per kW of sanctioned load. Reducing your sanctioned load reduces it, but only if your actual peak demand genuinely fits within the lower load.
- Why is my average rate lower than my marginal rate?
- Because the cheap early slabs pull the average down. Every additional unit you consume is billed at the highest slab you have reached, so savings from efficiency are always valued at the marginal rate.
- Does this apply to commercial connections?
- Partly. Commercial and industrial tariffs add demand charges, time-of-day rates and power factor penalties, which this calculator does not model.