How many people are using the toilet right now?

Scope: adults aged 18+, toilets and latrines, including urinals. Children, diaper changes, queuing, handwashing and open-air elimination are excluded. This is therefore not a count of everyone relieving themselves.

No sensors or individual observations. Duration, timing and facility access remain uncertain. Single-person digits do not imply accuracy to one person.

Calculation: adult population × facility-use share × [(daily urinations − daily bowel movements × combined share) × urine-only duration × urinary time profile + daily bowel movements × bowel-visit duration × bowel time profile] ÷ 86,400. Profiles are normalised over 24 hours.

Australian guidance gives 4–8 urinations per day. The central model uses 6 urinations and 1 bowel movement per day. These are plausible assumptions, not measured worldwide averages. Local studies do not establish worldwide occupancy duration.

Assumed durations: 60 seconds for urination and 4 minutes with a bowel movement; combined share 80% and facility-use share 96%. These inputs and hourly profiles are editorial assumptions. Regional populations and adult shares remain approximate. No age or sex breakdown without sufficient data.

Toilet access is not universal. WHO/UNICEF sanitation figures do not measure instantaneous occupancy, and safely managed sanitation is not the same as simply having a toilet. The access coefficient is a global sensitivity assumption, not an observed rate for each region.

Selected sources

• Australian Government — Bladder and bowel health
• Sensor-based evaluation of a Urine Trap toilet in a shared bathroom (2022)
• Defecation posture and bowel movement patterns (2019)
• Popcol study — Normal bowel habits (2010)
• UN — World Population Prospects 2024
• WHO/UNICEF JMP — Household sanitation 2000–2024