Water Consumption Calculator
Daily and monthly household water use, cost and tank duration. Results update as you type.
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Results
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About the Water Consumption Calculator
Estimate how much water a household uses each day, month and year, what it costs, and how long a storage tank lasts. Enter the number of people, the litres used per person, and any extra use such as a garden or car washing.
The default of 135 litres per person per day is a common planning figure for Indian households; use your own meter reading if you have one.
Choose your currency (₹, $, €, £ and more) and every amount updates. The calculation runs in your browser, so the numbers you enter are not uploaded.
Water Consumption Calculator example
People in the household: 4
Litres per person per day: 135 L
Garden, car or other extra use per day: 40 L
Days: 30
Water tariff per 1,000 litres: 15
Storage tank size: 1000 LWater used per day: 580 litres
Water used in 30 days: 17,400 litres
Per person per day: 145 litres
Per year: 211,700 litres
Water cost for 30 days: ₹261
A full tank lasts: 1.7 daysHow it is calculated
Daily use is people × litres per person plus any extra use. It is multiplied by the number of days, and the cost is the kilolitres used times your tariff per 1,000 litres. A tank lasts its capacity divided by the daily use.
Daily use = people × litres per person + extra usePeriod use = daily use × daysCost = kilolitres used × tariff per 1,000 litresTank lasts = tank size ÷ daily use
What to enter
- Litres per person per day. Blank = 135 L, a common planning figure for Indian households. Many countries use more.
- Days. Blank = 30 days.
- Storage tank size. To see how long a full tank lasts.
Assumptions and limits
Tariffs differ by city and by slab; enter the rate from your water bill.
How to use the Water Consumption Calculator
- Fill in the fields above. Required fields are marked, optional ones can be left blank and fall back to the defaults described on this page.
- Use “Try an example” to see a worked case, then replace the numbers with your own.
- Read the results as you type. The large card is the main answer and the smaller cards are the related figures.
- Copy a single value or everything, or share a link that keeps your inputs.
Water Consumption Calculator FAQ
How does the water consumption calculator work?
Daily use is people × litres per person plus any extra use. It is multiplied by the number of days, and the cost is the kilolitres used times your tariff per 1,000 litres. A tank lasts its capacity divided by the daily use.
How much water does a person use a day?
It depends on the climate, the home and the habits. Planning figures range from about 100 to 150 litres in many cities and are higher in places with large gardens or bathtubs.
How accurate is the tank estimate?
It assumes steady daily use and a full tank. Real use varies, and some tanks cannot be fully drained, so keep a margin.
Is this water consumption calculator free and private?
Yes. It is free with no sign-up, and the calculation happens on your device, so your numbers are never sent to a server.
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