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Shower Water Calculator

Water and cost savings from shorter showers

Shower Water Usage

Duration (minutes)
Flow Rate (L/min)

Water Usage

Per Shower (L)
64
Daily (L)
64
Annual (L)
23360

A shower water calculator shows litres per shower and annual usage. Standard shower heads use 8–12 L/min; water-efficient models use 6–8 L/min.

  1. 1Litres per shower = Duration (min) × Flow rate (L/min)
  2. 2Annual = Per shower × showers per week × 52
  3. 3Water cost = Volume × water tariff
  4. 4Heating water is ~18% of home energy bills
9-minute shower, 10 L/min=90 L per shower; 32,850 L/year (1 shower/day)
ActivityLitres
7-min shower (10 L/min)70 L
7-min shower (eco, 6 L/min)42 L
Bath150–200 L
Washing machine (full)45–80 L
Dishwasher (full)12–18 L
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