Fitness & Sports
Hydration for gym, running, cycling, workouts, and hot-weather exercise.
Most popular in Fitness & Sports
Athlete & Workout Water Intake
Daily target including sweat replacement for training duration, intensity, and heat.
Open calculatorSweat Loss & Workout Rehydration
Estimate sweat replacement for training sessions plus your baseline daily intake — for runners, gym-goers, and cyclists.
Open calculatorRunning Water Intake
Sweat-replacement calculator for runners — accounts for run duration, pace, and weather.
Open calculatorExplore the full library
Judo Water Intake
Sweat-loss-based fluid plan for judo.
OpenKarate Water Intake
Sweat-loss-based fluid plan for karate.
OpenBoxing Training Water Intake
Sweat-loss-based fluid plan for boxing training.
OpenSpin 45Min Water Intake
Sweat-loss-based fluid plan for spin 45min.
OpenCycling 100Km Water Intake
Sweat-loss-based fluid plan for cycling 100km.
OpenCycling 50Km Water Intake
Sweat-loss-based fluid plan for cycling 50km.
OpenTrail Run 10K Water Intake
Sweat-loss-based fluid plan for trail run 10k.
OpenTrail Run Half Water Intake
Sweat-loss-based fluid plan for trail run half.
OpenTriathlon Sprint Water Intake
Sweat-loss-based fluid plan for triathlon sprint.
OpenTriathlon Olympic Water Intake
Sweat-loss-based fluid plan for triathlon olympic.
OpenIronman Water Intake
Sweat-loss-based fluid plan for ironman.
OpenCreatine Water Intake Calculator
Extra daily water needed when supplementing creatine, with maintenance and loading modes.
OpenSimple, accurate, personalized
Pick your calculator
Choose the one that matches your situation from the grid above.
Enter a few details
Weight, activity, climate, species — takes under 30 seconds.
Get your target
A research-backed daily target plus an hourly schedule.
Learn the science behind fitness & sports
Read our in-depth guides for research-backed context on every calculator here.