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Safe Water Access Percentage Calculator

Work out safe water access percentage instantly with clear inputs, formula shown and shareable results.

About Safe Water Access Percentage Calculator

Divides the population with safely managed water by the total and converts the shortfall into the extra daily volume needed at the chosen service level.

Formula

Water coverage

Coverage (%) = population with access / total population x 100; daily demand (m3) = people x litres per person per day / 1000

Worked example

With the default values below, Safe Water Access Percentage Calculator returns Safe water coverage of 82.000%. Change any input above and every figure here is recalculated in your browser.

Inputs used

People with safely managed wateraccepts 0–1,000,000,000
82,000
Total populationaccepts 1–2,000,000,000
100,000
Service levelaccepts 5–300 L/person/day
50 L/person/day

Results

Safe water coverage
82.000%
People without safely managed water
18,000
Daily demand currently served
4,100.0 m3
Additional daily demand if all were served
900.0 m3

Step by step

  1. 1Values used
  2. 2Water coverage
  3. 3Safe water coverage= 82.000
  4. 4People without safely managed water= 18,000
  5. 5Daily demand currently served= 4,100.0 m3
  6. 6Additional daily demand if all were served= 900.0 m3

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What is safely managed drinking water?

Water from an improved source, accessible on premises, available when needed and free from contamination — the SDG 6.1 standard.

How much water is needed per person?

50 to 100 litres a day covers basic needs; 20 litres is the minimum in emergencies.

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