Three sports, one clock
A triathlon finish time is the sum of five parts: swim, T1, bike, T2 and run. Most estimates online ignore transitions, which is why they look optimistic. Two minutes of transition in a sprint race is 8% of the total; in an Ironman it is under 1%, but it is still two minutes.
Paces, not splits
The calculator takes swim pace per 100 m, average bike speed in km/h and run pace per kilometre. That lets you test scenarios: how much time does 1 km/h more on the bike save? On an Olympic course, 1 km/h is about 2 minutes 40 seconds. On a 90 km bike leg it is over 5 minutes.
What the estimate cannot know
Course elevation, wind, water temperature and drafting rules all move the result. A hilly 90 km bike at 30 km/h average is a different ride from a flat one at the same speed. Treat the output as a planning baseline, then adjust for the course profile and the forecast.
Frequently Asked Questions
Should I include transitions?
Yes — enter realistic T1 and T2 times from a previous race. First-timers usually take 3–5 minutes each; experienced athletes 60–90 seconds.
Which leg saves the most time?
The bike, because it is the longest. 2 km/h on the bike is worth more than 10 seconds per 100 m in the water on most courses.
Is the run pace the same as an open run?
No. Most age-groupers run 3–6% slower off the bike. Enter your triathlon run pace, not your fresh-legs pace.
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Privacy & your data
SwimRunPace calculates everything in your browser. Distances, times and body weights are never uploaded — there is no account, no server-side record and no training history stored between visits.