Illustrative calculator only. Real bills may include demand charges, minimum charges, subsidies, time-of-day rates, and billing adjustments not modeled here.
Billing mode & units
1 unit = 1 kWh
Fixed charges & taxes
Reverse: cost per unit
From a known bill and usage (same billing period).
Appliance → monthly kWh
kWh ≈ (watts ÷ 1000) × hours × days per month.
Daily → monthly units
Tenant / roommate split
Sample tier rates (illustrative)
| Preset | Tier 1 (early kWh) | Tier 2 | Tier 3+ |
|---|---|---|---|
| Tamil Nadu (sample) | ₹3 | ₹5 | ₹8 |
| Karnataka (sample) | ₹4 | ₹6.5 | ₹9.5 |
| Maharashtra (sample) | ₹5 | ₹8 | ₹11 |
| Delhi (sample) | ₹3.5 | ₹6 | ₹8.5 |
Use your DISCOM bill to replace these with real slab limits and rates.
What is a unit of electricity?
A unit on your bill is 1 kilowatt-hour (kWh): energy used when a 1 kW load runs for one hour. Example: a 500 W appliance for 2 hours = 1 kWh.
How your electricity bill is built
Utilities multiply your kWh by the applicable rate per slab, add fixed charges (connection, meter, minimum), then apply duties and GST as per state rules. Commercial and industrial tariffs differ.
How to reduce your bill
Lowering total kWh keeps you in cheaper slabs. Prioritise high-wattage devices (AC, geyser, heater), improve insulation, and choose efficient appliances. Solar can offset daytime use—compare generation vs your load profile with a specialist.
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FAQ
- How is electricity bill calculated?
- Energy charges = units × slab rates; then fixed charges and taxes are added. This tool models a simplified version of that flow.
- What is 1 unit of electricity?
- 1 unit = 1 kWh, the energy from 1 kW of power used for one hour.
- Why is my bill high?
- Higher consumption, crossing into higher slabs, seasonal cooling/heating, and tariff changes all raise the total.
- How to reduce electricity bill?
- Cut runtime on heavy loads, improve efficiency, and monitor kWh with meter readings or smart plugs.