Hydration Schedule for 80 kg Person Exercising on a Hot Day
An 80 kg person exercising in 30°C heat needs significantly more fluid per hour than typical office-environment guidance suggests.
How to use this tool
- Enter body weight, hours of activity and temperature in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your target per hour and the full breakdown beneath it.
Heat and exercise dramatically increase fluid needs — see the recommended hourly hydration targets for an 80 kg person in 30°C weather.
Frequently asked questions
- Does temperature affect hydration needs?
- Yes — for every 5 °C above 20 °C this calculator adds 10% to the base requirement to account for sweat losses.
- Should I drink all at once or spread it out?
- Spread intake evenly throughout the day. Drinking too much at once can dilute blood sodium (hyponatremia) in extreme cases.