SweatRateSweatRate
Turn a simple weigh-in into your real sweat rate — and know exactly how much to drink.
Download on the App Store
Screenshots
Features
Measure, don't guess
Weigh yourself before and after a workout, add what you drank and how long you trained. SweatRate instantly calculates your hourly sweat rate using the proven body-mass method the pros use.
Your number for every temperature
Log a few sessions and SweatRate learns how you sweat in the cool, the warmth and the heat — so you get your own rate for each condition, not a generic estimate.
Plan your next hydration
Tell SweatRate how long your next session will be and it recommends exactly how much to drink, with a handy sip-every-20-minutes target to stay ahead of dehydration.
See your trend
A clean chart shows how your sweat rate changes over time and across heat, so you can dial in your fueling season after season.
Metric or imperial
Works in kg/mL/°C or lb/fl oz/°F. Perfect for runners, cyclists, gym-goers, hikers and sauna lovers anywhere in the world.
Private and one-time
Everything stays on your device — no account, no tracking. Try your first 3 sessions free, then unlock everything with a single one-time purchase. No subscription, ever.
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 math 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.