Electricity Bill & Appliance Cost Calculator
Units, the bill and what each appliance costs — with your own tariff.
1. Electricity used
Start from the examples or add your own. Use the watts on the appliance’s rating plate, or the kWh per year on its BEE star label.
2. Your tariff
No tariff is built in — rates differ by state, DISCOM and category and change every year. Copy them from your last bill or your State Electricity Regulatory Commission’s tariff order.
Tariff orders by state
- Maharashtra (MERC)
- Delhi (DERC)
- Uttar Pradesh (UPERC)
- Gujarat (GERC)
- West Bengal (WBERC)
- Andhra Pradesh (APERC)
- Telangana (TGERC)
- Kerala (KSERC)
- Rajasthan (RERC)
- Madhya Pradesh (MPERC)
- Bihar (BERC)
Other states: search for your state’s Electricity Regulatory Commission and its latest tariff order for your DISCOM and category (for example LT residential).
Untick if your tariff charges all units at the rate of the slab your total falls in. Enter the slab limits as your tariff states them for your billing period.
Fixed charges, fuel adjustment, duty and tax
Estimated bill
Add your appliances or units, then your tariff.
How the bill adds up
Units and cost by appliance
3. Savings from switching
Same hours and quantity as the line you replace. For a star-rated AC or fridge, enter the kWh per year from the new model’s label.
Results are estimates for general information and planning, not financial advice. Banks and institutions may calculate differently (rounding, fees, rate changes). Confirm figures with your lender or a qualified adviser before deciding.
About the Electricity Bill & Appliance Cost Calculator
See how many units (kWh) your home uses and what the bill comes to. List your appliances — the watts on the rating plate and the hours a day, or the kWh per year printed on a fridge’s or AC’s BEE star label — or simply enter the units from your bill or meter. Then enter your tariff: one rate per unit, or slabs as your electricity company charges them, with the fixed charge, fuel adjustment, electricity duty, any per-unit tax and a subsidy.
You get the estimated bill line by line, the average and the next-unit cost, how much each appliance uses and costs, and what switching would save — a 9 W LED for a 60 W bulb, a BLDC fan, or a 5-star AC instead of a 3-star one, with the payback time. No tariff is built in: rates differ by state, DISCOM and category and change every year, so the tool links to the regulators’ tariff orders and uses the rates you enter.
How to use it
- Under Electricity used, edit the example appliances or add yours: power in watts (from the rating plate) and hours a day — or, for a fridge or AC, the kWh per year from the star label. Or choose Units from my bill or meter.
- Pick the billing period: one month, two months (many DISCOMs bill every two months) or any number of days.
- Under Your tariff, enter one rate per unit or the slabs — the upper limit of each slab and its rate — as printed on your bill or in the tariff order.
- Open Fixed charges, fuel adjustment, duty and tax and fill in what your bill shows; leave the rest empty.
- Read the estimated bill and the breakdown, then try Savings from switching for any appliance.
Examples
9 W × 6 hours a day × 30 days × 4
9 × 6 × 30 × 4 ÷ 1,000 = 6.48 units (kWh)
350 units · up to 100 at ₹3, 101–300 at ₹6, 301–500 at ₹8, above at ₹10
100 × 3 + 200 × 6 + 50 × 8 = ₹1,900 of energy charges
If the tariff charged all units at the rate of the slab the total falls in, 350 units would cost 350 × ₹8 = ₹2,800.
Label: 900 kWh per year · 8 hours a day for 30 days
900 × (8 × 30) ÷ 1,600 = 135 units
The label’s figure is for 1,600 hours of cooling a year.
60 W bulb → 9 W LED, 6 hours a day
10.8 − 1.62 = 9.18 units less a month; at ₹7 a unit, about ₹782 a year
Common uses
- Checking whether a high bill is plausible for what you run.
- Seeing which appliances use the most — usually cooling, water heating and anything that runs all day.
- Deciding whether an LED, a BLDC fan or a 5-star appliance pays for itself, and how fast.
- Planning the electricity cost of a new AC, a geyser or a rented flat.
How the units are worked out
- From watts: energy (kWh, the “unit” on your bill) = power (W) × hours of use ÷ 1,000. A 75 W fan running 10 hours a day uses 0.75 kWh a day, 22.5 kWh in 30 days.
- From a fridge’s star label: the label gives kWh per year from a standard test; the tool takes that × days ÷ 365.
- From an AC’s star label: the energy consumption standard for room air conditioners (Ministry of Power notification S.O. 2528(E), para 4(3)(i), in the Bureau of Energy Efficiency’s compilation of the AC notifications) works out the seasonal energy use for 1,600 cooling hours a year, and BEE’s label regulations (BEE/S&L/AC/37/2017-18) print that figure on the label as the electricity consumption in units per year. So an AC’s units = label kWh per year × your hours of use ÷ 1,600.
ACs and fridges switch their compressors on and off (or slow them down), so their rated watts × hours overstates their use; the star-label figure is the better starting point for them.
How the bill is worked out
- Telescopic slabs (the common case): each slab’s rate applies to the units within it — the first 100 at the first rate, the next ones at the second and so on. Untick the option if your tariff charges all units at the rate of the slab the total falls in.
- Fixed charge: a fixed amount for the period, or a rate per kW of sanctioned load.
- Fuel / power purchase adjustment (FAC, FPPCA and similar): per unit, or as a percentage of the energy charges.
- Electricity duty: a percentage, either of all the charges above it or of the energy charges only — tariffs differ; your bill shows which.
- Tax or cess per unit, then any subsidy or rebate is deducted, and the total is rounded if your bill rounds.
The next-unit cost is what one more unit adds at your current consumption, which is what an extra appliance or a saving is really worth.
Where to find your tariff
Your bill usually prints the slab rates, the fixed charge and the duty. The full tariff is in the tariff order of your State Electricity Regulatory Commission, for example MERC for Maharashtra, DERC for Delhi or KSERC for Kerala; the tool links to more under Tariff orders by state. Use the rates for your category (for example LT residential), and the slab limits exactly as the tariff states them for your billing period (one month or two).
Limitations
- An estimate. Real bills can include arrears, meter rent, security-deposit interest, prompt-payment discounts, minimum charges and time-of-day rates that this tool does not model; your DISCOM’s bill is what counts.
- Subsidy schemes (free units, rebates) have their own conditions — enter only the amount that applies to you.
- Some tariffs are telescopic only up to a set consumption and charge every unit at one rate above it; choose the slab option that applies to your units for that bill.
- Appliance use is what you enter: thermostats, compressor cycling and standby make real consumption differ.
- Up to 60 appliance lines and 12 slabs.
Privacy
Everything happens in your browser. Your appliances and tariff are saved in this browser only so they are there next time; nothing is uploaded.
Frequently asked questions
How do I calculate electricity units from watts?
Units (kWh) = watts × hours ÷ 1,000. A 1,500 W geyser used for 30 minutes a day uses 1,500 × 0.5 ÷ 1,000 = 0.75 units a day, or 22.5 units in 30 days.
How many units does an AC use?
Use the kWh per year on its BEE star label: that figure is for 1,600 hours of cooling a year. At 8 hours a day for 30 days (240 hours), an AC labelled 900 kWh/year uses about 900 × 240 ÷ 1,600 = 135 units.
What is a telescopic slab tariff?
Each slab’s rate applies only to the units inside that slab. With ₹3 up to 100 units and ₹6 above, 150 units cost 100 × ₹3 + 50 × ₹6 = ₹600 — not 150 × ₹6. These rates are only an example; enter your own.
Why is there no tariff for my state built in?
Tariffs differ by state, by DISCOM and by consumer category, and they are revised every year — a built-in table would soon be wrong. Copy the rates from your bill or your regulator’s tariff order; the tool remembers them in your browser.
How much does switching to LED or a 5-star appliance save?
Open Savings from switching, choose the appliance and enter the new one’s rating (watts, or the kWh per year from the new label). The saving is the difference in your bill, so it uses your own slab rates, and with a price you also get the payback time.
Is this my exact bill?
No — it is an estimate from the units and rates you enter. Arrears, meter rent, deposits, discounts and special rates can change the amount you pay.