Transition Practice Planner Calculator

T1 (swim-to-bike) and T2 (bike-to-run) are the "fourth and fifth disciplines" of triathlon, and this calculator models how they improve with deliberate practice rather than just racing more. It uses a diminishing-returns curve: each practice session closes about 2% of the remaining gap between your current time and a realistic floor (45 seconds for T1, 30 seconds for T2 — age-group benchmarks, not elite-level numbers), so the formula is projected time = current time minus (gap to floor × [1 − 0.98^sessions]). That means your first ten sessions buy back noticeably more time than your next ten — early practice reps are the highest-leverage ones, and returns taper hard as you approach the floor, so don't expect linear gains forever.

T1 is further split into wetsuit removal (about 35% of the projected time) versus helmet/shoes/bike-grab (the remainder), while T2 splits into racking-the-bike-and-helmet-off (about 40%) versus shoe-change-and-gear-grab — useful for knowing which specific motion to drill rather than practicing the whole transition as one blur. The season-wide time-saved figure simply multiplies your per-transition savings across 5 races as a fixed assumption, so adjust it mentally if your actual race calendar has more or fewer events. Keep in mind these floors and improvement rates are reasonable estimates for age-group athletes, not hard physical limits — a genuinely elite transition artist can go faster, and someone with mobility limitations or complex gear (e.g., a wetsuit that's difficult to remove) may plateau well above them.