Water Needed: 90 kg, 120 Minutes, Moderate Intensity
A 90 kg person exercising for 2 hours at moderate intensity should drink approximately 1.35 to 1.8 litres of water.
How to use this tool
- Enter body weight, exercise duration and intensity in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your total water needed and the full breakdown beneath it.
Calculate hydration requirements for a long 2-hour moderate-intensity session at 90 kg.
Frequently asked questions
- When should I start drinking during exercise?
- Start hydrating before thirst sets in — thirst is a delayed signal. For sessions over 30 minutes, begin drinking within the first 15 minutes and continue at regular intervals.
- Do I need electrolytes?
- For sessions under 60 minutes, plain water is sufficient for most people. For longer or higher-intensity sessions (especially in heat), replacing sodium and potassium via sports drinks or salty snacks helps prevent hyponatraemia.