How this calculator works
The page uses median finish times by distance, age group and sex, then divides each total into the three disciplines using typical race proportions. Bike time is the largest share, around half of the race, and the run is a little over a third for long-course races. Transitions make up the remainder, which is small in a long race and proportionally larger in a sprint. Median values are used rather than means because a few very slow finishers pull the mean upward and make the field look slower than it is. The age-group totals cover 18 to 64; older brackets extend the 60 to 64 value at the commonly reported six percent per decade decline, so treat them as indicative.
Formula
Finish time = the median total for the distance, age group and sex. Swim = total x swim share, bike = total x bike share and run = total x run share. Transition = total - swim - bike - run. Shares are sprint 17/48/32 percent, Olympic 16/49/32 percent, half Ironman 10/50/37 percent and Ironman 10/50/38 percent. Age groups above 60-64 multiply the 60-64 total by 1.06 for each five-year bracket.
Worked example
A 35 to 39 year old man racing an Olympic distance has a median total of 2:42:19, or 9,739 seconds. Swim at 16 percent is 1,558 seconds, or 25:58. Bike at 49 percent is 4,772 seconds, or 1:19:32. Run at 32 percent is 3,116 seconds, or 51:56. The remaining 292 seconds, about 4:52, is transition time.
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Frequently asked questions
Is the average the same as the median?
No. Finish times have a long right tail because a few people take much longer, which pulls the mean above the median. The median is the middle finisher and is usually the more useful target for a typical athlete.
Why do the splits not add exactly to the total?
The three discipline shares are typical proportions and do not account for every race. The remainder is shown separately as transition time, which includes the changes between sports and any stops.
How much do courses and weather change the result?
A lot. A hilly bike course, a hot run or a windy swim can move a half Ironman finish by 20 to 45 minutes or more. The table describes a typical course, not the one you are racing.
Should I use this as my goal time?
Use it as a comparison, not a prescription. Training history, current fitness and the specific course matter more. A finish near the median is a reasonable first target, and a faster time is possible with consistent training.