Water Needed: 80 kg, 90 Minutes, Moderate Intensity
An 80 kg person exercising at moderate intensity for 90 minutes needs approximately 900 ml to 1.1 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.
Estimate how much water an 80 kg person should drink during a 90-minute training session.
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.