STP Capacity Calculator for Hotels
Estimate sewage flow in KLD from water use or room count, pick the next standard STP size and see how much treated water you could reuse.
How to use the free STP Capacity 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 STP Capacity Calculator for Hotels runs fully in your browser on mobile or desktop – no sign-up and nothing is uploaded. Free STP capacity calculator for hotels. Turn daily water use or rooms and guests into sewage KLD, a standard plant size and treated water reuse value.
Sizing an STP for a hotel
Many hotels and resorts in India need a sewage treatment plant (STP) as a condition of their consent from the State Pollution Control Board, especially where there is no municipal sewer. The plant is sized in KLD, kilolitres per day, based on how much sewage the property generates on a busy day.
- Daily water use: enter your metered figure, or estimate it from rooms × guests × litres per guest per day plus staff, kitchen and laundry use.
- Sewage factor: roughly 80% of the water a building uses ends up as sewage; the rest is lost to gardening, evaporation and cleaning.
- Design margin: add a factor for busy days, peak flows and future rooms. A 20% margin is a common starting point.
- Standard size: choose the next standard plant capacity, such as 10, 15, 20, 25 or 30 KLD.
Worked example
A 40-room hotel with 2 guests per room at 180 litres, plus 5,000 litres for staff, kitchen and laundry, uses 19,400 litres a day. At 80% this produces 15.5 KLD of sewage. With a 1.2 margin the design flow is 18.6 KLD, so a 20 KLD plant is the next standard size.
Reusing treated water
Treated water can usually be reused for toilet flushing, landscaping and cooling towers when it meets the quality norms set in your consent. Reuse cuts fresh water and tanker bills, which this calculator values at your cost per kilolitre. Dual plumbing for flushing is far cheaper to plan at construction than to retrofit.
Measure real usage first with the water consumption calculator and keep your consent paperwork in order using the pollution NOC checklist. Technology choice (MBBR, SBR, MBR and others), space and sludge handling need an expert. These results are estimates; confirm capacity with an STP consultant and your SPCB.
Frequently asked questions
What does KLD mean for an STP?
KLD means kilolitres per day. One KLD is 1,000 litres of sewage treated per day, so a 20 KLD plant handles about 20,000 litres a day.
Why is sewage taken as 80% of water use?
Part of the water a hotel uses is lost to gardening, evaporation, cleaning and drinking, so roughly 80% returns as sewage. Use a higher factor if you have little landscaping.
Does every hotel need an STP?
It depends on your state, size, location and whether a municipal sewer is available. Check the conditions in your consent from the State Pollution Control Board.
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