Water usage calculator
A realistic monthly and yearly water use estimate for a home or small business.
Water usage calculator
People
Water + sewage price per m3
Average shower time per person / day (min)
Toilet flushes per person / day
Tap use in household / day (min)
Laundry cycles / week
Dishwasher cycles / week
Garden watering / week (L)
Monthly use (L)
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Monthly use (m3)
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Yearly use (m3)
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Monthly cost
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Yearly cost
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Base assumptions
Shower: 8 L/min
Toilet: 6 L / flush
Washing machine: 50 L / cycle
Dishwasher: 12 L / cycle
Tap: 6 L/min
The starting values are intentionally conservative and fully editable. Treat the result as a practical estimate for customer discussions and equipment sizing.

Water usage calculator estimates monthly and yearly consumption for a household or small business based on typical habits (showers, laundry, dishwasher, toilet flushing). It is useful for sizing water treatment solutions (softener, whole-house filtration, service planning) and for explaining running costs to customers.

The result is an approximation. Accuracy depends on your inputs, water pressure, fixtures and daily routines. For equipment sizing, confirm with real meter readings over at least 7-14 days.

FAQ - Water usage calculator

How can I estimate water use without bills?

Start with the number of people and the main activities (showers, laundry, dishwasher). It provides a solid baseline for planning.

How many liters are in 1 m3?

1 m3 equals 1000 liters. This helps you interpret results and compare different scenarios.

What usually drives water consumption the most?

Showers, toilet flushing, outdoor use and frequent laundry. Fixture type and shower time matter a lot.

How do I include garden watering or car washing?

Add seasonal usage separately. Estimate extra liters per week and convert to a monthly figure.

Can I use this result to size a water softener?

Yes as a starting point for volume and flow assumptions. You still need water hardness and desired regeneration frequency.

Why does the estimate differ from my water meter?

Differences come from habits, leaks, pressure, appliance cycles and uncounted uses. Adjust inputs based on real readings.

How can I reduce water use without losing comfort?

Fix leaks, use aerators, shorten showers and run appliances efficiently. Small changes often add up quickly.