Electricity Bill Calculator

Estimate your electricity bill appliance by appliance

Why was this month’s power bill so high, and what will a new AC add? This electricity bill calculator answers both. List the appliances in your home — fans, lights, fridge, TV, air conditioner, geyser, washing machine and more — with how many you have and how long they run each day. It works out the units (kWh) each one uses in a billing period and turns them into an estimated bill using your own tariff.

Switch to Meter readings or bill units to bill a period straight from the previous and current readings (or the units on your bill), then add a fuel or power-purchase surcharge and any subsidy. No state tariff is built in, because slabs, fixed charges and duty change with each commission order: copy yours from your bill or your State Electricity Regulatory Commission’s current order.

Tariffs differ around the world, so you can use a flat rate per unit (common in the US, UK and Europe) or slab rates where each block of units costs more than the last (used by most Indian electricity boards and some US utilities), plus a fixed charge and tax or electricity duty. A bar chart shows which appliances cost most, with tips for the biggest savings.

How to use the Electricity Bill Calculator

1. Start from the example home or press “Remove all appliances”, then pick appliances from “Add an appliance”. Each one comes with a typical wattage you can change.
2. For each appliance enter its power in watts (on the label or in the manual), how many you have, and the hours it runs per day.
3. Set the days in your billing period — 30 for a monthly bill, or about 60 if you are billed every two months.
4. Choose “Flat rate” and enter your price per kWh, or “Slab rates” and type the slabs from your bill. Add the fixed charge and the tax or duty percentage.
5. Read the estimated bill, the units used and the cost per appliance, then follow the tips for your biggest consumers.

Electricity Bill Calculator features

How electricity units are calculated

Electricity is billed in kilowatt-hours (kWh), also called units. One unit is 1,000 watts used for one hour. For each appliance: units = watts × quantity × hours per day × days ÷ 1,000.

Example: three 75 W ceiling fans running 10 hours a day for 30 days use 75 × 3 × 10 × 30 ÷ 1,000 = 67.5 kWh. A 1.5 ton AC drawing 1,500 W for 6 hours a day uses 270 kWh — four times as much as all three fans together.

Rated wattage is the maximum. Fridges, ACs (especially inverter models), geysers and irons are controlled by thermostats and switch on and off, so their real consumption is lower than wattage × hours. Enter the hours the compressor or heating element actually runs, or check your appliance’s energy label for its annual kWh figure. To convert between watts, kilowatts and horsepower, use the power converter; for kWh, joules and calories, the energy converter.

Slab tariffs: telescopic vs non-telescopic

With a telescopic slab tariff, each block of units is charged at its own rate. Using the example slabs (₹3.50 up to 100 units, ₹5 for 101–200, ₹6.50 for 201–400, ₹8 above 400), 250 units cost 100 × 3.50 + 100 × 5 + 50 × 6.50 = ₹1,175.

With a non-telescopic tariff, once you cross a threshold every unit is billed at the higher rate, so the same 250 units would cost 250 × 6.50 = ₹1,625. Some boards charge the fixed charge per kW of sanctioned load. The example slabs are illustrative only — copy the real figures from your bill or your state commission’s tariff order.

Typical power use of home appliances