SweatRateSweatRate
From a simple weigh-in to your own sweat rate — and exactly how much to drink next time.
Download on the App Store
Screenshots
Features
Your sweat rate from one weigh-in
Weigh in before and after, add what you drank and how long you trained. SweatRate instantly works out your sweat loss and hourly sweat rate using the proven body-mass method.
Dehydration warning
You see straight away how much body mass you lost — with a clear warning if you crossed the 2% line where performance drops.
Your rate for every heat band
Log a few sessions and the app learns how you sweat in the cold and the heat — your own number for each temperature band, not a generic estimate.
Plan your next drink
Tell it how long your next session will be and get exactly how much to drink, with a handy "sip every 20 minutes" target.
Metric and imperial
Work in kg/mL/°C or lb/fl oz/°F — whichever you prefer.
One-time purchase, all on device
Free for your first 3 sessions. A single one-time purchase unlocks unlimited records, full trend charts and temperature insights. No subscription, no account, no tracking.
SweatRate turns a simple before-and-after weigh-in into your personal hourly sweat rate — the number athletes use to nail their hydration. No guesswork, no generic charts: just your own body, measured.
HOW IT WORKS
Weigh yourself right before and right after a workout, add how much you drank and how long you trained. SweatRate does the maths instantly using the proven body-mass method:
Sweat loss = (weight before − weight after) + fluid you drank
Sweat rate = sweat loss ÷ time
You immediately see your sweat loss, your sweat rate per hour and how much body mass you lost — with a warning if you crossed the 2% dehydration line where performance drops.
KNOW YOUR NUMBER FOR EVERY CONDITION
Log a few sessions and SweatRate learns how you sweat at different temperatures. Cool morning run or a scorcher at noon — you get your own rate for each heat band, not a one-size-fits-all estimate.
PLAN YOUR NEXT DRINK
Tell SweatRate how long your next session will be and it recommends exactly how much to drink to stay ahead of dehydration, with a handy "sip every 20 minutes" target.
BUILT FOR ATHLETES
• Runners, cyclists, gym-goers, hikers and sauna lovers
• Metric and imperial units (kg/mL/°C or lb/fl oz/°F)
• Trend chart of your sweat rate over time
• Everything stays on your device — no account, no tracking
Free to try with your first 3 sessions. Unlock SweatRate Pro once for unlimited records, full trend charts and temperature insights — a one-time purchase, no subscription.
Stop guessing how much to drink. Measure it.