Shower water usage
How much water and money your showers use per year, and what a shorter shower would save.
How it works
Litres per year = people × minutes × flow × 365. Cost = m³ × (water price + heating cost).
Results are for guidance only and do not replace professional advice.
Worked example
With the default values:
- People in the household3
- Shower length (minutes)9
- Shower head flow (L/min)12
- Water price (per m³)5.2
- Cost to heat 1 m³ of water6
you get:
- Yearly shower cost€1,324.51
- Litres per year118,260 L (118.3 m³)
- Litres per shower108 L
- 2 minutes shorter saves€294.34/yr
Frequently asked questions
How does the “Shower water usage” tool work?
Litres per year = people × minutes × flow × 365. Cost = m³ × (water price + heating cost).
What do I need to enter?
Just fill in: people in the household, shower length, shower head flow, water price, cost to heat 1 m³ of water. The result updates as you type.
Can you give an example?
People in the household: 3; Shower length (minutes): 9; Shower head flow (L/min): 12; Water price (per m³): 5.2; Cost to heat 1 m³ of water: 6 → Yearly shower cost: €1,324.51; Litres per year: 118,260 L (118.3 m³).
Is this calculator free, and is my data private?
Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.