Water Intake Calculator
How much water should I drink per day? A common starting point is 0.033 litres per kg of bodyweight — roughly 2.3L for a 70 kg adult. However, your true needs are higher if you exercise, live in a hot climate, or are pregnant or breastfeeding. The old "8 glasses a day" rule is a rough guideline; this calculator gives you a personalised target.
Why Hydration Matters
The Role of Hydration
Water makes up around 60% of your body weight and is essential for virtually every physiological process. Adequate hydration supports cognitive function (even 1–2% dehydration impairs focus and memory), metabolic rate (studies show drinking 500ml boosts metabolism by 24–30% for up to an hour), and kidney health by flushing waste and reducing kidney stone risk.
Signs of Dehydration
Dehydration is more common than most people realise. Key warning signs include:
- •Dark yellow or amber-coloured urine
- •Persistent headaches or brain fog
- •Fatigue and reduced physical performance
- •Dry mouth, lips, or skin
- •Dizziness, especially when standing up
Track Water & Nutrition Together
FitScanned tracks your daily water intake alongside calories and macros — giving you a complete picture of your nutrition in one place.