Interactive Calculator · 2026
Daily Water Consumption Calculator
Estimate a building's total daily water consumption. Pick a building type, enter the occupancy, and see how much water it uses each day in KLD (kilolitres per day) — split across bathing, flushing, washing and the kitchen.
Where the 54 KLD goes — end-use split
Your building
NBC 135 LPCD, full plumbing
Litres per person (or unit) per day — editable for your case.
Where the water goes
Your 54 KLD split across the main end uses in a typical building:
- Bathing (30%)16.2 KLD
- Flushing (25%)13.5 KLD
- Washing / laundry (20%)10.8 KLD
- Kitchen (15%)8.1 KLD
- Drinking / other (10%)5.4 KLD
Flushing and washing are the biggest targets for reuse of treated water — together they are nearly half of daily demand.
How this is calculated
- Total litres/day = occupancy × LPCD = 400 × 135 = 54,000 L/day.
- Total KLD = litres/day ÷ 1000 = 54 KLD.
- Annual use = KLD × 365 = 19,710 KL/year.
- End-use split — bathing 30%, flushing 25%, washing/laundry 20%, kitchen 15%, drinking/other 10% of the total.
Indicative estimates for concept planning per NBC/CPCB norms. Actual consumption varies with fittings, behaviour and metering — confirm with measured data before design decisions.
Related Guides — Deep-dive reading
Water Consumption Estimation for Buildings: LPCD Norms, Occupancy & End-Use Breakdown
How to estimate a building's daily water demand from its occupancy and NBC per-capita norms, break it down by end use, and turn that number into the foundation for sizing water supply, storage and sewage systems.
Sewage Treatment PlantsGreywater vs Blackwater Explained (And Why It Matters for Reuse)
The used water your building produces is not all the same. Separating the lightly dirty water from the truly foul water is the single trick that makes on-site water reuse cheap, safe and practical — explained in plain language, with no engineering background assumed.
Sewage Treatment PlantsRajasthan STP Guidelines & RSPCB Norms: The 2026 Compliance Guide
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