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Welcome to the Cycling Sweat Rate Calculator, the most accurate tool for determining your specific hydration needs on the bike. By analyzing your weight change before and after a ride, this Cycling Sweat Rate Calculator provides a scientific blueprint for your fluid and sodium intake, ensuring you never bonk or cramp again.
Pedalynx
Performance Tools
Sweat Rate &
Hydration Calculator
Enter your pre and post-ride weights to calculate your personal sweat rate, hydration targets, and electrolyte needs.
Your Ride Data
Pre-Ride Weight
kg
Post-Ride Weight
kg
Fluid Consumed
ml
Ride Duration
min
Sweat Type
Not sure? Choose Average. If you notice white salt marks on your kit or skin after rides, select Salty Sweater.
Please fill in all fields with valid values. Post-ride weight must be less than or equal to pre-ride weight.
Your Hydration Report
—
HYD-000000
Section 1 — Your Sweat Rate
—ml/hr
Personal Sweat Rate
—
⚠ You lost more than 2% of your body weight in fluid. This level of dehydration can significantly impair performance and wellbeing. Prioritise rehydration before your next effort.
Section 2 — Your Hydration Plan
Drink every 15 minutes
—ml
—
Bottles per hour (500ml)
—bottles
—
Total Sweat Loss
—ml
Total fluid lost during this ride
Weight Lost
—kg
—
Section 3 — Electrolyte Strategy
Sodium Loss
—mg/hr
—
Electrolyte Tablets
—per hr
Based on ~300–500 mg sodium per tablet
Electrolyte Recommendation
—
How to Get Accurate Results — Protocol Tips
1
Weigh yourself naked and dry
Clothing holds sweat — even a damp jersey can weigh 200–400g and skew your result significantly. Towel dry before stepping on the scale, both before and after the ride.
2
Empty your bladder before both weigh-ins
Urinating before your pre-ride weigh-in and again before your post-ride weigh-in eliminates a major variable. Any urine lost during the ride would otherwise be counted as sweat loss.
3
Log every ml you drink — precisely
Use a measured bottle, not an estimate. A standard bidon is 500ml or 750ml. If you drank from a café or fountain, estimate conservatively at 250ml per serving.
4
Test in different conditions
Your sweat rate changes dramatically with temperature, humidity, and intensity. Run this test on a hot summer ride and again on a cold day — the results will surprise you. Use the worst-case figure for race planning.
5
Are you a Salty Sweater?
Check your kit and skin after a long hot ride. White residue or a gritty feeling on your face and arms means you lose more sodium per litre than average. Salty sweaters are significantly more prone to cramping and need dedicated electrolyte strategy, not just plain water.
6
Start drinking before you’re thirsty
Thirst is a late-stage dehydration signal — by the time you feel thirsty you may already be 1–2% down in body weight. Set a timer on your bike computer to prompt drinking every 10–15 minutes, regardless of how you feel.
Check out our Full Road Cycling Guide for more tips and info !
👉 Click Here to calculate if weight or aero win on your specific gradient
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If you want to find out how your “Trainer Difficulty” setting is altering your workout, Use our free Zwift Difficulty Calculator tool to see the truth.
