Footbench All tools
Training

Match & Training Hydration

How much should a player drink in a session or a match? The answer depends on heat, duration, intensity and body mass. We calculate all four.

To drink
0 L
0 mL per break
Sweat rate estimate
1.0 L/h
Heat category
Mild

Why “drink 2 litres a day” is the wrong answer here

Daily fluid targets are about preventing chronic dehydration. Football hydration is a different problem: replacing what you lose in the next 90 minutes, on this pitch, at this temperature. Two numbers drive it: your sweat rate (L/h) and how long you’re out there. Sweat rate varies from ~0.4 L/h (cool day, easy session) to over 2.5 L/h (30°C+, repeated-sprint HIIT).

How this calculator works

  1. We pick a base sweat rate from your activity type (e.g. 1.0 L/h for an 11-a-side match).
  2. We adjust for ambient heat and humidity using a simple heat-index multiplier. Hot, humid days push sweat rate up; cool days push it down.
  3. Acclimatised players sweat more efficiently — we add a small adjustment up.
  4. Total = sweat rate × duration. We split it across realistic break points (kick-off, halftime, every 15 min if hot).
  5. If you supplied your own measured sweat rate from a previous session (weigh-in / weigh-out), we use that instead — it’s more accurate.

Limitations

  • Population-average sweat rates vary ± 30% across individuals. A real weigh-in/weigh-out is the gold standard.
  • Salt loss is not modelled. Players who cramp easily may need more sodium, not more water.
  • Children and adolescents should be supervised — over-drinking (exercise-associated hyponatraemia) is rare but real.

FAQ

Should I drink a fixed amount every 15 minutes?

Ad libitum (drink to thirst) actually performs similarly in trained athletes. The exception is very hot, humid conditions or sessions over 75–90 min where thirst lags behind loss. Use scheduled sips as a floor, not a ceiling.

What about energy drinks?

For sessions over ~75 min, ~30–60 g/h of carbohydrate helps endurance. Most commercial 6–8% sports drinks are designed for this. For a 90 min match at moderate intensity, plain water is fine for the fluid side; add carbs separately if needed.

Does caffeine help?

3–6 mg/kg about 60 min before exercise is a small, evidence-supported performance boost. It is also mildly diuretic — if you’re already sweating heavily, account for that extra fluid loss.