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Duathlon Time Calculator

Estimate your duathlon finish time.

How it is calculated

The tool adds five times, all in minutes: first run, bike, second run, and the two transitions T1 (run to bike) and T2 (bike to run). total = run1 + bike + run2 + T1 + T2. Transitions are optional and count as 0 if left empty. The total is rounded to the nearest whole minute and shown both as h:mm and as minutes. Seconds are therefore not kept: 103.5 minutes becomes 104. Enter times as decimal minutes, so 1 minute 30 seconds is 1.5. The tool only sums what you enter. It does not slow down your second run for fatigue, and it does not check that the numbers are realistic. The three legs must be given, no field may be negative, and the total must be above zero; otherwise no result is shown.

Worked example

An athlete expects a 25-minute first run, a 62-minute bike, a 14-minute second run, and transitions of 1.5 and 1 minutes. Legs: 25 + 62 + 14 = 101 minutes. Transitions: 1.5 + 1 = 2.5 minutes. Total: 101 + 2.5 = 103.5 minutes, which the tool rounds to 104. In hours and minutes that is 1 hour 44 minutes. The tool shows a total of 1:44 and 104 min. Transitions are only 2.5 of those minutes, but they are timed like any other leg.

Try this example →

Common mistakes

  • Typing legs as minutes.seconds, such as 25.30 for 25 minutes 30 seconds. The fields are decimal minutes, so half a minute is 0.5 and 25 minutes 30 seconds is 25.5.
  • Giving the second run the same pace as the first. After the bike, the legs are usually slower, so enter a realistic second-run time rather than a copy of the first one.
  • Leaving the transitions blank and treating the total as a finish time. Empty transitions count as 0 (the example without them gives 1:41), but the real T1 and T2 take time that is part of your official result.
  • Reading 1:44 as 1 hour 44 minutes 0 seconds precisely. The total is rounded to the minute, so the seconds are lost.
  • Entering a leg's time in hours, such as 1.2 for the bike. All fields are in minutes, so 1.2 would mean just over one minute of cycling.

About this calculator

A duathlon is a multisport race consisting of a run, then a bike leg, then a second run (run-bike-run), with two brief transition periods between the legs where athletes change gear and equipment. Total finish time is simply the sum of the three legs plus both transitions — but predicting each leg's split accurately requires accounting for the fact that the second run is almost always slower than the first, since legs are already fatigued from cycling ("brick" fatigue), and transition times (T1 and T2) are easy to underestimate when planning a race.

Duathlon is popular as both a standalone discipline and as off-season or winter training for triathletes, since it removes the swim leg while preserving the run-bike pacing and transition skills that carry over to triathlon racing. Age-group athletes and coaches use finish-time calculators like this to set realistic race-day goals based on recent training paces and bike splits, and to decide how much time to budget for gear changes in transition.

This calculator adds your run, bike and second-run splits together with your transition times to estimate your total duathlon finish time.

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