SweatRate

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.