Duathlon Finish Time Calculator
A duathlon consists of two run legs and one bike leg, with a transition zone between each discipline. Predicting your finish time before race day lets you pace each segment effectively, set realistic goals, and identify which discipline has the most room for improvement. This calculator breaks down the race into its five components: run 1, transition 1, bike, transition 2, and run 2. Enter your expected pace for each segment and the distances for your chosen race format to get a predicted total finish time, split by component. Works for any duathlon distance from sprint to long-course.
Run 1
Bike
Run 2
Duathlon finish time formula
Run time (min) = Distance(km) x Pace(min/km)
Bike time (min) = Distance(km) / Speed(km/h) x 60
Total = Run1 + T1 + Bike + T2 + Run2
Frequently asked questions
What is a duathlon?
A duathlon is a multisport event consisting of a run segment, followed by a cycle segment, then a second run segment (run-bike-run format). Common distances include sprint (5km run, 20km bike, 2.5km run), standard (10km run, 40km bike, 5km run), and long-course formats.
How is duathlon finish time calculated?
Total finish time = Run 1 time + Transition 1 time + Bike time + Transition 2 time + Run 2 time. Each segment time is calculated from the segment distance divided by the pace per kilometre or kilometres per hour.
What pace should I target for my first duathlon?
For a sprint duathlon, target a run pace 10 to 15 seconds per km slower than your 5km race pace to leave energy for the bike and second run. On the bike, aim for 85 to 90% of FTP to maintain speed without blowing up before the second run.
How long are transitions in a duathlon?
Elite athletes transition in 30 to 60 seconds. Age groupers typically take 1 to 3 minutes. Practice your transitions to minimise lost time. Key factors are racking bike efficiently, helmet/shoe strategy, and familiarity with the transition zone layout.
Does cycle power or speed matter more in duathlon?
Both matter, but normalised power and pacing strategy are more important than average speed. A consistent effort at 85 to 90% FTP throughout the bike segment tends to produce better overall times than surging and fading, especially on hilly courses.
Official sources
- World Triathlon: World Triathlon / Duathlon Competition Rules.
- USA Triathlon: USA Triathlon Competitive Rules.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.