Fluid Intake Calculator
Calculate your daily water requirements. Depending on age, weight and activity. With clear explanations, recommendations and comparison values.
Note: These calculations are for informational purposes only and do not replace professional tax or financial advice. All information without guarantee.
Frequently Asked Questions
How much water should I drink per day?
The German Nutrition Society recommends about 1.5 liters of water per day for adults. Total fluid needs (including food) are about 35 ml per kg of body weight. More is needed during exercise or hot weather.
What counts toward my daily fluid intake?
Water, unsweetened tea, and diluted juice spritzers are ideal. Coffee counts too, despite the myth. Fruits and vegetables also contribute significantly. Avoid sweetened drinks and excessive alcohol.
What is the Fluid Intake Calculator?
The fluid intake calculator computes the recommended daily drinking amount based on body weight, age and activity.
How does the Fluid Intake Calculator work?
Enter weight, age and activity level. The calculator determines the base requirement (approx. 30-35 ml per kg body weight) and adds supplements for exercise, heat or illness.
Key Data and Facts
Recommended: 30-35 ml per kg body weight/day. German Nutrition Society recommendation: approx. 1.5 litres of drinking (plus fluid from food). During sport: approx. 0.5-1 l extra per hour.
Step-by-Step Guide
How to calculate Ihren taeglichen Fluessigkeitsbedarf step by step: 1. Koerpergewicht enter: Der Grundbedarf betraegt ca. 30-35 ml pro kg Koerpergewicht. 2. Alter beruecksichtigen: Aeltere Menschen haben ein vermindertes Durstgefuehl, sollten aber mindestens 1,5 Liter taeglich trinken. Kinder benoetigen relativ mehr Fluessigkeit pro kg. 3. Aktivitaetsniveau angeben: Bei Sport ca. 0,5-1,0 Liter zusaetzlich pro hour intensiver Belastung. 4. Umgebungsbedingungen: Bei Hitze (ueber 30 Grad) oder trockener Luft (beheizte Raeume im Winter) steigt der Bedarf um 0,5-1,0 Liter. 5. Besondere Umstaende: Fieber erhoeht den Bedarf um ca. 0,5 Liter pro Grad ueber 37 Grad. Schwangerschaft: ca. 300 ml zusaetzlich. Stillzeit: ca. 600-700 ml zusaetzlich. 6. DGE-Empfehlung: Ca. 1,5 Liter durch Getraenke (Wasser, Tee, Saft) plus ca. 0,9 Liter durch Nahrung. Optimale Getraenke: Wasser, ungesuesster Tee, verdünnte Saefte.
Calculation Example
Person, 75 kg, leichte Aktivitaet: Grundbedarf = 75 x 33 ml = 2.475 ml (ca. 2,5 Liter total). Davon ca. 1,6 Liter als Trinkfluessigkeit, Rest ueber Nahrung.
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