Calculadora de Demanda de Água
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
L/dia = banho×9 + descargas×8 + roupa×15/7 + louça×2 + bebida×3
About this calculator
This calculator estimates daily household water consumption based on common activities: shower, toilet flush, laundry, dishwashing, and drinking. It uses average liters per use, giving you a rough idea of your daily water footprint. It is a helpful tool for awareness and planning to reduce consumption.
The calculation sums the consumption of each activity. For showers, multiply the number of showers by 9 liters; for flushes, by 8 liters; for laundry, multiply the number of washes per week by 15 and divide by 7 to get the daily average; dishwashing uses 2 liters per wash; and drinking, 3 liters per person. The result is in liters per day.
Use this calculator to monitor your daily consumption, compare it to the average household (about 150 to 200 liters per person), and identify saving opportunities. For example, reducing shower time or installing dual-flush toilets can significantly lower water usage.
Caution: these are average values and may vary depending on showerhead, toilet, or washing machine type. The calculator does not account for leaks or outdoor use (e.g., gardening). For a more accurate assessment, check your water bill or install individual meters.
Frequently asked questions
How can I reduce my water consumption in the shower?
Take shorter showers, install a low-flow showerhead, and turn off the water while soaping.
Does the calculator consider dishwasher use?
No, it considers manual dishwashing. Dishwashers vary, typically using 10 to 15 liters per cycle.
What is the average water consumption per person in Brazil?
The national average is about 150 liters per person per day, but it varies greatly by region and habits.
How can I detect leaks at home?
Turn off all taps and check the water meter for 30 minutes. If it keeps spinning, there is a leak.