Calculadora de Hidratação Diária
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
ml/dia = 35 × peso (kg)
About this calculator
The Daily Hydration Calculator estimates the ideal amount of water a person should consume per day based on body weight. The general clinical reference used is 35 ml per kilogram of weight. For example, a 70 kg person would need 2450 ml of water per day (35 x 70). This tool is useful for those seeking to maintain proper hydration, essential for functions such as temperature regulation, nutrient transport, and toxin elimination.
The calculation is simple: multiply your weight in kg by 35. The result is the recommended daily volume in milliliters. The formula is based on guidelines from health organizations like the World Health Organization, which suggest this range for healthy adults under normal conditions. However, individual needs may vary according to physical activity level, climate, age, and health status.
Use this calculator to set a daily water intake goal, especially if you have trouble remembering to drink water or want to monitor your hydration. It is useful for athletes, people working in hot or dry environments, or anyone looking to improve health habits. Remember that water can also come from foods and other beverages, but plain water is the best source.
Cautions: the calculator provides a general estimate. People with medical conditions such as kidney, heart, or liver failure may need fluid restriction. Pregnant women, breastfeeding women, and the elderly may also have different needs. Consult a doctor or nutritionist for personalized guidance. Additionally, in hot climates or during intense exercise, intake should be higher to compensate for sweat loss.
Frequently asked questions
Do I need to drink exactly the calculated amount every day?
The calculator gives a general goal, but you can adjust based on thirst, physical activity, and climate. The key is to keep urine light and volume adequate.
Does water from food count towards hydration?
Yes, fruits, vegetables, soups, and other beverages contribute to total fluid intake. The calculator considers total water, but drinking plain water is recommended.
Is this calculator suitable for children?
No, the 35 ml/kg formula is for adults. Children have different needs; consult a pediatrician.
What happens if I drink less or more than recommended?
Drinking less can cause dehydration, with symptoms like fatigue and headache. Drinking far more than needed can strain the kidneys, but it's rare in healthy people.
Should I drink more water if I'm sick?
Yes, fever, vomiting, or diarrhea increase fluid loss. Increase intake and consult a doctor if needed.