Work out water usage per person instantly with clear inputs, formula shown and shareable results.
Personal water use is dominated by showering and flushing: an eight minute shower at 9 L/min is 72 litres, and five 6 litre flushes another 30. Typical UK use is around 140 litres per person per day, so a low-flow shower head is the single most effective reduction.
Water use
daily = shower minutes x flow + flushes x 6 L + other use
About 140 litres per person in the UK, 150-200 across much of Europe and over 300 in the United States, largely because of outdoor use.
A 6-7 L/min aerating shower head and shorter showers. Together they can cut personal use by a third with no visible change in comfort.