Ecology

Water Demand Calculator

Estimate total water demand for a population.

Calculated Output

Daily demand 750,000

Yearly demand (ML) 273.75

Formula: demand = population * per capita use

Step-by-Step Breakdown

1. Values used:

2. Population = 5,000

3. Daily use per person = 150

5. Daily demand = Population x Daily use per person = 5,000 x 150 = 750,000

6. Yearly demand = 273.75ML

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The math behind it

daily demand = population x litres per person. Divide yearly litres by 1,000,000 for megalitres.

5000 people at 150 L/day needs 750,000 L daily (274 ML/year).

What is a typical per capita use?

Varies from ~50 L/day (developing) to 300+ L/day (wealthy countries).