The most common triathlon formats range from super sprint through sprint and standard/Olympic to long-course events such as IRONMAN 70.3 and IRONMAN. A common sprint is 750 m / 20 km / 5 km, standard is 1.5 km / 40 km / 10 km, IRONMAN 70.3 is 1.9 km / 90 km / 21.1 km, and full IRONMAN is 3.8 km / 180 km / 42.2 km.
World Triathlon publishes common formats, but real courses can vary. The 2026 World Triathlon Hamburg open sprint, for example, uses a 500 m swim with a 20 km bike and 5 km run. IRONMAN 70.3 and IRONMAN are branded formats with fixed headline distances, while generic terms such as “middle distance” can describe different combinations.
Triathlon distances at a glance
| Format | Swim | Bike | Run | Total |
|---|---|---|---|---|
| Super Sprint | 400 m | 10 km | 2.5 km | 12.9 km |
| Sprint | 750 m | 20 km | 5 km | 25.75 km |
| Standard / Olympic | 1.5 km | 40 km | 10 km | 51.5 km |
| World Triathlon Middle | 2.5 km | 80 km | 20 km | 102.5 km |
| T100 | 2 km | 80 km | 18 km | 100 km |
| IRONMAN 70.3 | 1.9 km | 90 km | 21.1 km | 113 km / 70.3 mi |
| World Triathlon Long | 4 km | 120 km | 30 km | 154 km |
| IRONMAN | 3.8 km | 180 km | 42.2 km | 226 km / 140.6 mi |
The World Triathlon table above is best understood as a map of common categories. Local organizers can use permitted variations, and non-World-Triathlon events may use their own course lengths.
Super Sprint triathlon
Super sprint is one of the most accessible ways to race a full swim-bike-run format. It reduces the endurance requirement while keeping transitions, open-water skills and pacing decisions relevant.
Best for
First-time triathletes, youth and athletes who want a short, fast event without the training commitment of long-course racing.
Main challenge
The short duration makes transitions and high-intensity pacing disproportionately important. There is less time to recover from a slow start or equipment mistake.
Sprint triathlon
The common sprint format is roughly twice a super sprint. It is long enough to reward endurance but still short enough that experienced racers can compete at a high intensity throughout.
Sprint is especially prone to event variation. A 500 m swim version can be several minutes faster than a 750 m race even when the bike and run are identical.
Standard or Olympic-distance triathlon
Standard distance is commonly called Olympic distance because the Olympic individual triathlon uses the 1.5/40/10 structure. For age-group athletes, it is a major step up from sprint because the swim and bike are doubled and the final run becomes a full 10K.
It is also an excellent bridge into longer racing: you learn open-water pacing, bike fueling and how to run after a meaningful cycling effort without needing a half-day event.
Middle distance is not always IRONMAN 70.3
This is one of the most common sources of confusion. World Triathlon currently lists a common Middle format of 2.5 km swimming, 80 km cycling and 20 km running. IRONMAN 70.3 is 1.9 km / 90 km / 21.1 km.
“Half Ironman” usually refers specifically to the IRONMAN 70.3 format, while “middle distance” can refer to a broader category. If a race is not an official IRONMAN 70.3, verify the exact distances before planning pacing, nutrition or comparing finish times.
IRONMAN 70.3 / Half Ironman
IRONMAN states that 70.3 represents the total distance in miles: 1.2 miles swimming + 56 miles cycling + 13.1 miles running = 70.3 miles.
A 70.3 is where nutrition and durability become central performance factors. The bike takes multiple hours for most age-group athletes, and the run is a full half marathon. See our Half Ironman distance guide and average Half Ironman time analysis for deeper coverage.
T100 distance
World Triathlon lists the T100 format as 2 km swimming, 80 km cycling and 18 km running, totaling exactly 100 km. It sits in the same broad long-course conversation as middle-distance racing but is not the same as IRONMAN 70.3.
World Triathlon long distance
World Triathlon's common Long format is 4 km / 120 km / 30 km. This demonstrates why “long-distance triathlon” should not automatically be used as a synonym for full IRONMAN: different governing bodies and event series use different structures.
Full IRONMAN distance
A full IRONMAN is 140.6 miles / 226 km. IRONMAN's official overview describes the race as a 2.4-mile swim, 112-mile bike and 26.2-mile marathon, with athletes generally having up to 17 hours to finish.
The jump from 70.3 to full distance is not simply “the same race twice.” The extra hours make pacing, fueling, temperature management, mechanical reliability and late-race run durability much more important.
For real-world benchmarks, see Average Ironman Time: Age Groups, Men, Women & Splits.
Which triathlon distance should you choose?
Choose Super Sprint if...
You want the lowest barrier to completing all three disciplines or a short, high-intensity race experience.
Choose Sprint if...
You are new to triathlon, want manageable training demands or enjoy frequent racing.
Choose Olympic if...
You want a substantial endurance challenge without the long-course fueling and time commitment of a 70.3.
Choose 70.3 if...
You want a true long-course challenge, can train consistently across all three sports and are ready to practice race nutrition.
Choose IRONMAN if...
You have the time and training history to prepare for an all-day endurance event where execution matters as much as raw fitness.
Choose by the actual course
Distance is only one variable. Elevation, heat, swim setting and logistics can make a shorter event more demanding than the name suggests.
How the distances change training
-
Shorter races reward speed
Super sprint and sprint place a higher premium on high sustainable intensity, fast transitions and the ability to settle quickly after the swim.
-
Olympic distance adds endurance
You need enough aerobic durability to hold quality across a 40 km bike and 10 km run, while still racing at a relatively high intensity.
-
70.3 makes fueling strategic
Nutrition, aerodynamic comfort and bike pacing become major determinants of how well you can run the final half marathon.
-
IRONMAN is about durability
The race rewards the ability to keep producing sustainable output for many hours while managing food, fluids, heat, equipment and fatigue.
Frequently asked questions
What is the shortest common triathlon distance?
World Triathlon lists Super Sprint at 400 m swimming, 10 km cycling and 2.5 km running. Local events may be shorter or use different beginner formats.
What is a sprint triathlon distance?
The common sprint format is 750 m swim, 20 km bike and 5 km run, although real events can vary.
What is an Olympic triathlon distance?
The standard/Olympic format is 1.5 km swim, 40 km bike and 10 km run.
How long is a Half Ironman?
An IRONMAN 70.3 is 1.9 km swim, 90 km bike and 21.1 km run, totaling 113 km / 70.3 miles.
How long is a full Ironman?
A full IRONMAN is 3.8 km swim, 180 km bike and 42.2 km run, totaling 226 km / 140.6 miles.
Is middle distance the same as a Half Ironman?
Not necessarily. World Triathlon's common Middle format is 2.5/80/20, while IRONMAN 70.3 is 1.9/90/21.1.
Sources
- World Triathlon: common triathlon distances — Super Sprint, Sprint, Standard, Middle, T100, Long and IRONMAN reference formats.
- IRONMAN: About IRONMAN — official IRONMAN and IRONMAN 70.3 distances and general full-distance completion window.
- World Triathlon 2026 Age-Group Championships overview — current championship formats.
Distances shown as “common” follow the governing body's published reference table. Always verify the course page for the exact event you enter.
