Water Demand Calculator
Calculate water demand for cities, communities, and regions. Estimate average daily, maximum daily, and peak hour water demand for municipal planning and infrastructure design.
Water Demand Parameters
Total number of people in the area/city
WHO/UN recommended standard
% additional for waste/losses
Advanced Parameters
Default: 1.4
Default: 2.3
Water Demand Formula
ADD = LPCD × P + Waste%
Average Daily Demand = Liters per Capita per Day × Population + Waste
Population (P):100.00 thousand
LPCD:225 L/capita/day
Waste/Losses:10%
Water Demand Results
Average Daily Demand
24.75 million L/day
Maximum Daily Demand
34.65 million L/day
Peak Hour Demand
658.9 L/s
Annual Demand
9.03 billion L/year
Per Capita Analysis
Base Usage per Person:225 L/day (59 gal/day)
With Waste/Losses:248 L/day
Annual per Person:82.13 thousand L/year
Waste Allowance: 2.25 million L/day accounts for distribution losses, leaks, and system inefficiencies.
Infrastructure Sizing
Storage Tank Capacity:69.30 million L
Pump Capacity (Peak):2371875 L/hour
Treatment Plant Size:34.65 million L/day
Recommendations: Tank capacity = 2× max daily demand, treatment = max daily demand
Typical Water Usage Breakdown
Residential (60%)
- • Toilet flushing (24%)
- • Showers/bathing (17%)
- • Laundry (16%)
- • Faucets (19%)
- • Leaks (12%)
- • Other (12%)
Commercial (25%)
- • Office buildings
- • Restaurants
- • Hotels
- • Retail stores
- • Public facilities
Industrial (15%)
- • Manufacturing
- • Cooling systems
- • Process water
- • Food processing
- • Energy production
Global Water Usage Comparison
High Usage Regions
United States:500 L/capita/day
Australia:340 L/capita/day
Italy:250 L/capita/day
Spain:230 L/capita/day
Efficient Regions
Denmark:120 L/capita/day
Netherlands:130 L/capita/day
Germany:140 L/capita/day
Estonia:110 L/capita/day
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