Triathlons come in six common distances, from a beginner-friendly super sprint totaling about 13 kilometers to a full Ironman covering 140.6 miles. Every triathlon follows the same order: swim, bike, run. The distance of each leg scales up depending on which race format you enter.
Super Sprint
The super sprint is the entry-level triathlon distance and the best starting point if you’ve never raced before. It consists of a 400-meter swim, a 10-kilometer bike, and a 2.5-kilometer run, totaling 12.9 kilometers (about 8 miles). Most beginners finish in under an hour, while competitive athletes target around 45 minutes. You’ll sometimes see these marketed as “mini triathlons,” but they’re the same thing.
Sprint
The sprint distance is the most popular triathlon format worldwide. It doubles the super sprint across all three legs: a 750-meter swim, a 20-kilometer bike (about 12.4 miles), and a 5-kilometer run, totaling 25.75 kilometers. Average finish times land around 1 hour 30 minutes, with competitive racers coming in closer to 1:15.
Olympic (Standard) Distance
The Olympic distance, also called standard distance, is what you’ll see at the Summer Olympics and most international championship events. It covers a 1.5-kilometer swim (0.93 miles), a 40-kilometer bike (24.8 miles), and a 10-kilometer run (6.2 miles), totaling 51.5 kilometers.
For most age-group athletes, finishing an Olympic-distance triathlon takes about 3 hours. A competitive time is around 2:30, and elite professionals finish near 1:50. This is the distance where training shifts from “just finishing” to needing a structured plan, especially for the bike and run legs.
Half Ironman (70.3)
The half Ironman, officially branded as Ironman 70.3, gets its name from the total mileage: 70.3 miles. That breaks down to a 1.2-mile swim (1.9 km), a 56-mile bike (90 km), and a 13.1-mile run (21.1 km). Yes, the run is a half marathon.
This is where triathlon becomes a serious endurance commitment. The average finisher crosses the line in about 6 hours, competitive athletes aim for under 5 hours, and elite professionals finish around 3:45. Most training plans for a 70.3 span 12 to 20 weeks and assume you already have a base level of fitness in all three sports.
Full Ironman (140.6)
A full Ironman triathlon covers 140.6 miles: a 2.4-mile swim (3.8 km), a 112-mile bike (180 km), and a full 26.2-mile marathon (42.2 km). It’s one of the most demanding single-day endurance events in the world.
Average finish times sit around 13 hours for men and 14 hours for women. Most Ironman races set a cutoff at 17 hours. Competitive age-group athletes target sub-11 hours, while elite professionals finish in roughly 7:45. Training for a full Ironman typically requires 6 to 12 months of structured preparation, with peak training weeks exceeding 15 hours of swim, bike, and run combined.
Quick Distance Comparison
- Super Sprint: 400m swim, 10km bike, 2.5km run (12.9 km total)
- Sprint: 750m swim, 20km bike, 5km run (25.75 km total)
- Olympic: 1.5km swim, 40km bike, 10km run (51.5 km total)
- Half Ironman: 1.2mi swim, 56mi bike, 13.1mi run (70.3 mi total)
- Full Ironman: 2.4mi swim, 112mi bike, 26.2mi run (140.6 mi total)
Mixed Relay Format
The mixed relay triathlon debuted at the Tokyo 2020 Olympics and returned in Paris 2024. Four teammates each complete a super-sprint leg: a 300-meter swim, roughly 6.6-kilometer bike, and 1-kilometer run before tagging the next person. The Paris Olympic cycle used a male-female-male-female order. Total race time for a team is typically under 90 minutes, making it one of the fastest and most spectator-friendly triathlon formats.
Off-Road (XTERRA) Triathlons
XTERRA triathlons swap road bikes and pavement for mountain bikes and trails. Because terrain difficulty varies so much between venues, distances are targets rather than strict standards. The full XTERRA distance aims for a 1.5-kilometer swim, 30-kilometer mountain bike, and 11-kilometer trail run. The sprint version targets a 500-meter swim, 15-kilometer mountain bike, and 5-kilometer trail run.
In the United States, XTERRA events often use a slightly different format: a half-mile swim, 15-mile mountain bike, and 5-mile trail run. Expect these races to take significantly longer than a road triathlon of similar distance because of elevation gain, technical terrain, and the toll of off-road running.
Indoor Triathlons
Indoor triathlons flip the format from distance-based to time-based. Instead of swimming 750 meters, you swim for a set number of minutes and your score is how far you get. A common format is the “10-30-20”: 10 minutes of pool swimming, 30 minutes on a stationary bike, and 20 minutes on a treadmill. Some events use slightly different time blocks, such as 15 minutes of swimming, 30 minutes of cycling, and 15 to 20 minutes of running. These are popular in winter months and remove two of the biggest barriers for beginners: open-water swimming and traffic.
Ultra-Triathlon Distances
Beyond the full Ironman, a small community of athletes races ultra-triathlon events measured in multiples of the Ironman distance. A Double Ironman covers the full Ironman distance twice (4.8-mile swim, 224-mile bike, 52.4-mile run). A Deca Iron ultra-triathlon requires completing one full Ironman distance per day for 10 consecutive days, totaling 38 kilometers of swimming, 1,800 kilometers of cycling, and 422 kilometers of running. The most extreme documented format is the Triple Deca, which repeats this for 30 consecutive days. These events exist at the far fringe of endurance sport and attract only a handful of competitors worldwide.