Water Tank Size Calculator for Hotels
Work out daily water demand from rooms, guests, staff, kitchen and laundry, then split storage between overhead tanks and an underground sump.
How to use the free Water Tank Size Calculator for Hotels
- Enter your figures in the fields above – use real numbers from your PMS, channel manager or accounts.
- Tap the button to see the result instantly. Change any value to compare scenarios.
- Copy, print or save the result and use it in your daily or monthly review.
This Water Tank Size Calculator for Hotels runs fully in your browser on mobile or desktop – no sign-up and nothing is uploaded. Free water tank size calculator for hotels. Enter rooms, guests, litres per guest, staff, kitchen and laundry use to size the overhead tank and sump.
Why tank size matters for a hotel
Running out of water at 8 am, when every room is showering, is one of the fastest ways to collect bad reviews. Many Indian hotels depend on a municipal line, a borewell or tankers, and supply is rarely steady. Correct storage lets you ride out supply gaps and pump failures, while an oversized tank wastes space and lets water go stale.
How this calculator works
- Guests: rooms × guests per room × litres per guest per day. Planning figures of 135 to 180 litres per guest are common; use more for resorts with bathtubs, gardens or pools.
- Staff: 45 litres per person per day for those on site.
- Kitchen and laundry: add your own estimates, or zero if laundry is outsourced.
- Storage days: one day is the minimum; take 1.5 to 2 days if supply is unreliable.
Overhead tank and sump split
A common arrangement keeps about one-third of storage in overhead tanks, which feed rooms by gravity, and two-thirds in an underground RCC sump, which receives supply and is pumped up. Overhead tanks add weight to the roof, so larger volumes go below ground. For a 40-room hotel with 2 guests per room at 180 litres, 30 staff, 2,000 litres for the kitchen and 1,500 for laundry, daily demand is 19,250 litres. With one day of storage that is about 6,500 litres overhead and 13,000 litres in the sump.
Before you build
Check actual use from your meter readings with the water consumption calculator, keep fire-fighting storage separate as your fire NOC requires, and add tank cleaning to your maintenance checklist. Tanks should be cleaned and disinfected at regular intervals and kept covered. Bye-laws and structural limits vary by city, so treat these results as estimates and confirm sizes with a qualified plumbing or structural consultant.
Frequently asked questions
How many litres of water does a hotel guest use per day?
Planning figures of about 135 to 180 litres per guest per day are commonly used for hotels, and more for resorts with pools, gardens or bathtubs. Your own meter readings are the best guide.
How much water should be in the overhead tank?
A common practice is about one-third of total storage overhead and two-thirds in an underground sump, but roof strength and pump capacity decide the final split.
Does this include water for fire-fighting?
No. Fire-fighting storage must be kept separate and sized as per your fire NOC and local fire rules.
Want a revenue expert to check your numbers?
Get a free OTA, pricing and reputation audit from Revgrow360 — no obligation.