Find your water bill from daily usage.
Daily usage is totalled over the billing period, converted to kilolitres, and multiplied by your local tariff.
Cost: (Total litres ÷ 1000) × tariff per 1000 litres
The water usage calculator estimates how much water a household uses over a billing period and what it costs under a volumetric tariff. You enter daily litres, the number of days and the tariff per 1000 litres, and it returns total litres and the estimated bill.
Water billing in India differs widely. Some cities meter every connection and charge per kilolitre, often in slabs; others charge a flat monthly fee; many housing societies divide a bulk bill or tanker cost among flats. This calculator is most useful where water is metered or bought by volume, and for anyone trying to see how daily habits such as long showers, open taps and frequent washing add up over a month.
1. Estimate daily use: people in the home × litres per person per day, or read it from a meter over a few days.
2. Total litres = Litres per day × Number of days.
3. Convert to kilolitres by dividing by 1000. One kilolitre is also one cubic metre.
4. Bill = Kilolitres × Tariff per 1000 litres.
5. If your city uses slabs, apply each slab's rate to the kilolitres in that slab and add them.
6. Add any fixed charges, sewerage cess or meter rent shown on your bill.
Water tariffs are usually quoted per kilolitre, which is 1000 litres, or per cubic metre, which is the same volume. A 1000-litre overhead tank holds exactly one kilolitre. Household meters often read in cubic metres. The calculator asks for litres per day because that is easier to picture, then divides the total by 1000 to match the tariff. Keeping units consistent is the main thing to get right.
Indian urban planning norms commonly assume around 135 litres per person per day for cities with sewerage, covering bathing, toilets, washing, cooking and drinking. Actual use varies a lot. A bucket bath uses far less than a long shower, and a top-loading washing machine uses more than hand washing a small load. Toilets and bathing are usually the largest share. Measuring your own meter for a week is the best way to find your real figure.
Where water is billed at a flat rate, your usage does not change the bill, so this calculator shows the notional cost of the water rather than what you pay. Where slab tariffs apply, the first block is cheap and later blocks cost more, so heavy users pay a higher average rate. The calculator uses one rate. For slab billing, enter the rate of your top slab to see what extra usage costs, or split the calculation by slab.
The Kulkarni family of four uses about 540 litres a day, and their municipal meter is billed at ₹22 per 1000 litres for a 31-day month.
Answer: Estimated water bill ₹368; Total usage 16,740 litres
Mixing up per-litre and per-kilolitre rates, which makes the bill 1000 times off.
Using a per-person norm for a household with very different habits, such as a garden or a home business.
Ignoring slabs, sewerage charges or fixed fees that make up much of some bills.
Forgetting leaks: a dripping tap or running toilet can waste a large amount over a month.
Estimating a monthly metered water bill.
Comparing tanker water costs with municipal supply by volume.
Dividing a housing society's bulk water bill by flat usage.
Seeing how much a water-saving change, such as fixing a leak, would save.
Why do water tariffs vary so much by location?
Water supply is managed by local city governments, and each one sets its own rates. Both the price and even the billing unit can be very different from city to city.