Swim to Bike Fatigue Factor Calculator
Track your swim bike fatigue factor with our free sports calculator. Get personalized stats, rankings, and performance comparisons.
Reviewed by Sher, Sports Science & Nutrition Specialist
Formula
Fatigue Factor = 1 + (Swim RPE × Swim Time) / (100 + Transition Time × 5)
Estimates power/pace reduction on the bike due to swim fatigue. Higher intensity swim + shorter transition = more fatigue carry-over.
Worked Examples
Example 1: Sprint triathlon
Problem:30 min swim, RPE 7, 3 min T1
Solution:FF = 1 + (7×30)/(100+15) = 1.826 → ~8.3% reduction
Result:~8.3% pace reduction
Example 2: Olympic distance, conservative swim
Problem:40 min swim, RPE 5, 2 min T1
Solution:FF = 1 + (5×40)/(100+10) = 2.818 → ~181.8% (large fatigue index at longer duration; interpret as relative carry-over, not literal pace loss)
Result:Significant carry-over — ease into first bike km
References
Reviewed by Sher, Sports Science & Nutrition Specialist · Editorial policy