The world of triathlon is an exciting blend of swimming, cycling, and running, but the distances can vary wildly from 30-minute efforts to day-long endurance challenges. Here’s everything you need to know about triathlon distances.
Ever looked at a triathlete and wondered, “How far did they just go?” Or perhaps you’re asking yourself, “How far could I go?” Whether you’re a curious spectator, a budding athlete ready to sign up for your first race, or a seasoned competitor in one of triathlon’s constituent sports, understanding the different triathlon distances is key.
This guide is your quick and easy resource for everything you need to know. We’ll break down the standard distances, explain the non-negotiable order of events, and give you an idea of what to expect at every level of the sport. Let’s dive in!
What is the order of events in a triathlon?
A triathlon is a continuous endurance event made up of three distinct disciplines, always completed in the same order: swim → bike → run.
This sequence isn’t arbitrary or simply based on tradition—it’s designed to keep athletes safe while ensuring a smooth, engaging experience for competitors and spectators alike. Starting with the swim reduces the risk of athletes entering the water already fatigued, while finishing with the run allows for the safest and most controlled end to the race.
The moments between each leg of the race are known as transitions, and seasoned triathletes will tell you they’re just as important as the swim, bike, and run. Often referred to as the fourth discipline, transitions test your ability to stay organised, move efficiently, and maintain focus under pressure. Time gained or lost here can significantly impact overall performance—especially in shorter-distance events where every second counts.
A smooth transition isn’t just about speed; it’s about execution. Knowing exactly where your gear is, rehearsing your movement patterns, and staying mentally sharp can shave precious seconds off your race. On the flip side, a chaotic or poorly planned transition can undo much of the hard work from the previous leg.
T1 – Swim to bike
Transition 1 begins the moment you exit the water. You’ll strip off swim gear, locate your bike, and prepare for the cycling leg. This is often the most complex transition because it involves managing wet equipment, navigating a crowded transition zone, and safely mounting your bike beyond the designated line.
T2 – Bike to run
Transition 2 takes place after you dismount your bike and return it to your spot. Here, the focus shifts to switching from cycling to running—changing shoes, adjusting your posture, and settling quickly into your run rhythm. It may seem simpler on paper, but the sensation of “heavy legs” after the bike makes T2 a mental test as much as a physical one.
Mastering transitions can elevate your race experience from good to great. With practice, precision, and a calm mindset, they become an opportunity—not an obstacle—to gain momentum and outperform expectations.
Types of Triathlons
There is a triathlon distance for every fitness level and ambition. Here’s a quick overview of the main types, from a short dash to the ultimate fitness challenge of the T100 and beyond into all-day endurance tests.
- Super sprint triathlon: A quick, bite-sized race perfect for younger athletes or those who are completely new to the sport.
- Sprint triathlon: A highly popular entry-level race. It’s long enough to be a challenge but short enough to be accessible for beginners.
- Olympic distance triathlon: The official distance of the Olympic Games and the standard for many major races worldwide.
- T100 Triathlon: Hitting the sport in 2021, T100 is a high-octane race format designed to perfectly balance speed and endurance for the ultimate race experience.
- 70.3 triathlon (half-distance): Just a little longer than T100, ‘halves’ are a formidable long distance, requiring serious training and endurance.
- Iron distance triathlon (full-distance): The original ultra-endurance multisport event going back to 1978, full-distance triathlons – such as Ironman & Challenge Roth – are some of the most gruelling single-day endurance events in the world.
There are even some triathlons so long that they’re split over multiple days, requiring a dedicated support crew for each competitor. However, we’ll stick with the above distances, which represent those available to all amateur athletes.
Super sprint triathlon distances
Whether as youngsters or adults, the Super Sprint Triathlon is where many athletes dip their toes into the sport. These events are fast, fun and – fair warning – likely to get you hooked on triathlon. They typically take around 35 minutes to an hour to complete.
- Swim: 400m (0.24 miles)
- Bike: 10km (6.2 miles)
- Run: 2.5km (1.55 miles)
Super Sprint Triathlon events are available at selected T100 races as part of the festival weekend.
Sprint triathlon distances
Don’t let the name fool you—a sprint triathlon is still a fantastic workout! Probably the most popular distance for newcomers to the sport, Sprint Tris offer a fun and achievable challenge without turning your entire life over to training. It typically takes competitors between 1 and 1.5 hours to complete.
- Swim: 750m (0.47 miles)
- Bike: 20km (12.4 miles)
- Run: 5km (3.1 miles)
Sprint triathlon events are available at selected T100 races as part of the festival weekend.
Olympic distance triathlon distances
Also known as ‘standard’ distance, this is the triathlon distance you’ll see professional athletes compete over at the Olympic Games but is also very popular with amateur athletes. It requires a balanced blend of speed and endurance, covering a total of 51.5km. Average finishing times range from 2 to 3 hours, depending on an athlete’s skill level.
- Swim: 1.5km (0.9 miles)
- Bike: 40km (24.8 miles)
- Run: 10km (6.2 miles)
Olympic triathlon events are available at selected T100 races as part of the festival weekend.
T100 Triathlon distances
The T100 Triathlon distance – named for its 100km total – is a newer race format that first made waves on the professional circuit but is open to all amateur athletes.
As part of the elite T100 Triathlon World Tour series, it attracts the biggest names in the sport to race at iconic and inspirational locations around the world and gives amateurs the chance to race over the same distance as part of a festival of multisport events.
The unique distance is designed to be faster and more television-friendly than longer distances, creating exciting, high-stakes racing. For those looking for an incredible fitness challenge that perfectly blends required training time with race length and finish line satisfaction, this is the ultimate distance.
Depending on experience, times can vary from around 4 to 7 hours.
- Swim: 2km (1.24 miles)
- Bike: 80km (50 miles)
- Run: 18km (11.2 miles)
70.3 triathlon distances
Commonly known as a half-distance triathlon, the 70.3 triathlon gets its name from the total distance covered in miles. It is a big test of endurance, covering a total of 70.3 miles (113km). Typical times are around 5 to 8 hours.
- Swim: 1.9km (1.2 miles)
- Bike: 90km (56 miles)
- Run: 21.1km (13.1 miles) – a half-marathon
Iron distance triathlon distances
Also known as ‘full-distance’ triathlons, these are the longest one-day triathlon events, covering 226km. They require a serious time investment in training along with expert attention to fuelling and nutrition. Times for amateurs are anywhere from 9 to 17 hours.
- Swim: 3.8km (2.4 miles)
- Bike: 180km (112 miles)
- Run: 42.2km (26.2 miles) – a marathon
Triathlon Distances By Discipline
If you’re deciding which triathlon to choose based on each discipline, we’ve broken down each triathlon distance by swim, bike, and run below.
Triathlon swimming distance
How far do you swim in a triathlon? The distance varies significantly depending on the race you choose. The swim is the shortest leg in terms of distance, but it can be the most challenging discipline for amateurs, especially those not used to swimming in open water.
- Super sprint: 400m (0.24 miles)
- Sprint: 750m (0.47 miles)
- Olympic: 1.5km (0.9 miles)
- T100: 2km (1.24 miles)
- 70.3 (Half-distance): 1.9km (1.2 miles)
- Iron distance: 3.8km (2.4 miles)
Depending on ability, swim times can range from under 6 minutes for a fast Super Sprint swimmer to well over an hour for an iron-distance event.
Triathlon bike distance
The bike leg is the longest section of any triathlon in terms of both distance and time. This is where strategy, pacing, and nutrition play huge roles in your race-day success.
- Super sprint: 10km (6.2 miles)
- Sprint: 20km (12.4 miles)
- Olympic: 40km (24.8 miles)
- T100: 80km (50 miles)
- 70.3 (Half-distance): 90km (56 miles)
- Iron distance: 180km (112 miles)
Triathlon running distance
The final leg of a triathlon is the run. After taxing your body in the swim and bike, the run is a test of pure willpower and grit. The distance, again, depends on your chosen event.
- Super sprint: 2.5km (1.55 miles)
- Sprint: 5km (3.1 miles)
- Olympic: 10km (6.2 miles)
- T100: 18km (11.2 miles)
- 70.3 (Half-distance): 21.1km (13.1 miles) – a half-marathon
- Iron distance: 42.2km (26.2 miles) – a marathon
How to choose your triathlon distance
The right triathlon distance for you will depend on your fitness level, experience in the sports and the amount of time you can dedicate to training. If you’ve just caught the bug for exercising, a Super Sprint or Sprint Distance is ideal. If you’re already comfortable with a couple of hours of cardio, Olympic Distance is a great choice, provided you’re up for the 1.5km swim.
We might be biased, but when it comes to stepping things up, the T100 distance has a lot to offer. It’s certainly a serious challenge but one that’s achievable without dedicating every waking hour to training. T100 hits that sweet spot for training commitment, the length of the race and the sense of pride and elation that comes from crossing the finishing line. For those already well into their triathlon journey, T100 offers the ultimate balance of endurance and redline speed while still being an achievable fitness challenge for newcomers.
For athletes wanting to go even longer, 70.3 is going to be another hour or two on the course compared to a T100, and of course, full-distance events are prized as a mark of an athlete checking the box for impressive endurance chops.
Disclaimer: This article is for informational purposes only and should not replace professional training or medical advice. Always consult a coach or healthcare provider before starting a new training program.
