Work out safe water access percentage instantly with clear inputs, formula shown and shareable results.
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.
Water coverage
Coverage (%) = population with access / total population x 100; daily demand (m3) = people x litres per person per day / 1000
Water from an improved source, accessible on premises, available when needed and free from contamination — the SDG 6.1 standard.
50 to 100 litres a day covers basic needs; 20 litres is the minimum in emergencies.