A Sprint triathlon is typically a 750 m swim, 20 km bike and 5 km run. Olympic distance is 1.5 km, 40 km and 10 km. An IRONMAN 70.3 is 1.9 km, 90 km and 21.1 km, while a full-distance IRONMAN is 3.8 km, 180 km and 42.2 km. Super Sprint, World Triathlon Middle and Long, and the 100 km T100 format are also used. Individual race courses can vary, so always check the event guide before race day.
Triathlon distances chart: swim, bike and run in km and miles
If you are searching for a simple triathlon distances chart, this is the reference table to start with. World Triathlon lists Super Sprint, Sprint, Standard, Middle and Long formats for age-group racing, while IRONMAN uses the branded 70.3 and full-distance formats. T100 adds a modern 100 km race format.
| Format | Swim | Bike | Run | Total |
|---|---|---|---|---|
| Super Sprint | 400 m / 0.25 mi | 10 km / 6.2 mi | 2.5 km / 1.55 mi | 12.9 km / 8.0 mi |
| Sprint | 750 m / 0.47 mi | 20 km / 12.4 mi | 5 km / 3.1 mi | 25.75 km / 16.0 mi |
| Standard / Olympic | 1.5 km / 0.93 mi | 40 km / 24.9 mi | 10 km / 6.2 mi | 51.5 km / 32.0 mi |
| World Triathlon Middle | 2.5 km / 1.55 mi | 80 km / 49.7 mi | 20 km / 12.4 mi | 102.5 km / 63.7 mi |
| T100 | 2 km / 1.24 mi | 80 km / 49.7 mi | 18 km / 11.2 mi | 100 km / 62.1 mi |
| IRONMAN 70.3 | 1.9 km / 1.2 mi | 90 km / 56 mi | 21.1 km / 13.1 mi | 113 km / 70.3 mi |
| World Triathlon Long | 4 km / 2.49 mi | 120 km / 74.6 mi | 30 km / 18.6 mi | 154 km / 95.7 mi |
| Full distance / IRONMAN | 3.8 km / 2.4 mi | 180 km / 112 mi | 42.2 km / 26.2 mi | 226 km / 140.6 mi |
Local Sprint and Olympic-distance events can be slightly short or long because of roads, transition placement, water access and permitting. Branded IRONMAN events use their defined 70.3 or full-distance format, but athletes should still rely on the official athlete guide for the specific course.
What order are the disciplines in a triathlon?
A standard triathlon is completed in the same sequence regardless of distance: swim, bike, run. Between the three sports are two timed transitions. T1 takes you from swimming to cycling; T2 takes you from cycling to running.
Swim
The race starts in a pool or open water, depending on the event.
T1
Exit the water, remove swim gear, put on helmet and cycling equipment, then leave transition with the bike.
Bike
The bike is the longest discipline by distance in every common triathlon format.
T2
Rack the bike, change into running gear if needed and head onto the run course.
Run
The final discipline finishes at the race finish line.
Transitions count toward your finish time, so they are part of the race rather than a pause between sports. Our triathlon transitions guide explains T1, T2, setup and common beginner mistakes in detail.
Super Sprint triathlon distance
A World Triathlon Super Sprint uses a 400 m swim, 10 km bike and 2.5 km run. It is the shortest standard format in the main age-group distance table and can be an excellent entry point if your main goal is learning race logistics rather than testing long-course endurance.
Super Sprint racing is short enough that experienced athletes can race it very hard, but beginners can also use the format to practice open-water starts, transition flow and running off the bike without committing to a long day. If swimming is your biggest barrier, check whether the event offers a pool-based Super Sprint or a beginner wave.
Sprint triathlon distance: 750 m swim, 20 km bike, 5 km run
The Sprint triathlon distance is one of the most common first-race formats: a 750 m swim, 20 km bike and 5 km run. The total race distance is about 25.75 km, or roughly 16 miles before allowing for the extra distance you may cover through transition.
Sprint triathlon at a glance
25.75 kmA Sprint is long enough to reward endurance and pacing but short enough that training is usually easier to fit around work, study and family than long-course preparation.
For a first event, start with our first triathlon guide. If the distance already feels realistic, the 8-week Sprint triathlon training plan gives you a more specific route to race day.
Olympic triathlon distance: 1.5 km swim, 40 km bike, 10 km run
The Olympic triathlon distance, also called Standard distance by World Triathlon, consists of a 1.5 km swim, 40 km bike and 10 km run. That makes the total 51.5 km, or around 32 miles.
Compared with a Sprint, every discipline is exactly doubled. That sounds simple, but the race does not feel like merely two Sprint triathlons back to back. Pacing matters more, the swim is long enough to punish poor technique, and starting the 10K too aggressively after 40 km of cycling can turn the final kilometres into a difficult run.
An Olympic-distance race can still be a first triathlon for someone with a solid endurance base, but most complete beginners will find Sprint easier for learning the sport. If Olympic is your target, see our 12-week Olympic triathlon training plan.
Middle-distance triathlon vs IRONMAN 70.3
“Middle distance,” “half distance” and “70.3” are often used as though they mean exactly the same thing. They do not always. World Triathlon lists its Middle format as 2.5 km swim, 80 km bike and 20 km run. An IRONMAN 70.3 uses 1.9 km, 90 km and 21.1 km.
| Format | Swim | Bike | Run | Total |
|---|---|---|---|---|
| World Triathlon Middle | 2.5 km | 80 km | 20 km | 102.5 km |
| IRONMAN 70.3 | 1.9 km | 90 km | 21.1 km | 113 km / 70.3 mi |
Many independent races use “middle distance” more loosely for a course close to 70.3 proportions, so the event's own race guide is always the final reference. If you are specifically preparing for 1.9 km, 90 km and 21.1 km, our half-distance triathlon guide goes deeper into what each leg feels like and how to prepare.
IRONMAN 70.3 distance: how long is a half Ironman?
An IRONMAN 70.3 consists of a 1.2-mile swim, 56-mile bike and 13.1-mile run. In metric units that is approximately 1.9 km, 90 km and 21.1 km. The name 70.3 comes from the total distance in miles.
70.3 changes the problem from finishing three sports to managing one long race
The individual distances are familiar — a half marathon, a long bike ride and a manageable open-water swim — but combining them changes the demands. Fueling, hydration, aerodynamic comfort, pacing discipline and the ability to run after several hours on the bike become central to the result.
If 70.3 is your goal, useful next steps are the 20-week beginner half-distance training plan, our guide to average half-distance triathlon times and the half-distance pace chart.
T100 triathlon distance: 2 km, 80 km, 18 km
The T100 format covers exactly 100 km: a 2 km swim, 80 km bike and 18 km run. It sits between Olympic and 70.3 racing in total distance, but its 80 km bike still makes pacing and fueling substantially more important than in a Sprint or Olympic race.
It is not simply another name for 70.3 or World Triathlon Middle distance. If you enter a T100 event, train for the actual 2 km / 80 km / 18 km profile.
World Triathlon Long distance: 4 km, 120 km, 30 km
World Triathlon's age-group distance table also includes a Long format of 4 km swimming, 120 km cycling and 30 km running. At 154 km total, it is longer than 70.3 but shorter than a full-distance IRONMAN. It is less commonly encountered by beginners than Sprint, Olympic or 70.3, but it is useful to understand because “long-course triathlon” does not always mean exactly 140.6 miles.
Full-distance triathlon: how long is an IRONMAN?
A full-distance IRONMAN is a 2.4-mile swim, 112-mile bike and 26.2-mile marathon. In metric units that is approximately 3.8 km, 180 km and 42.2 km. The total branded race distance is 140.6 miles.
The distances are approximately double an IRONMAN 70.3, but the difficulty increases by more than the raw numbers suggest. You start a marathon after 180 km of cycling, and small pacing or fueling errors can compound for hours.
For deeper planning, use our full-distance training guide, 40-week full-distance training plan, full-distance pacing strategy and IRONMAN cutoff-time guide. You can compare expected performances in our average full-distance triathlon time article.
How long does a triathlon take?
Distance alone does not tell you exactly how long a triathlon will take. Finish time changes with fitness, swim conditions, bike elevation, wind, heat, transitions, course accuracy and race-day pacing. A flat Sprint on closed roads is a very different event from a hilly Sprint with a rough open-water swim.
One athlete, four distances
To show how distance turns into time, assume the same athlete can average a 2:10/100 m swim pace, 30 km/h on the bike and 5:30/km on the run. We then add 6 minutes of transitions for Sprint, 8 for Olympic, 10 for 70.3 and 15 for full distance.
| Distance | Illustrative finish time | Important note |
|---|---|---|
| Sprint | ~1:30 | Example only, not an average |
| Olympic | ~2:56 | Same assumed discipline paces |
| IRONMAN 70.3 | ~5:47 | Real long-course pace usually changes with duration |
| Full distance | ~11:29 | Fueling, fatigue and pacing become much more influential |
These are mathematical examples, not population averages or target times. Holding identical relative performance across very different durations is not realistic for every athlete.
For your own estimate, use the free Triathlon Race Time Calculator. Enter your swim pace, bike speed, run pace and transition times instead of relying on a generic average.
Sprint vs Olympic vs 70.3 vs full distance: what actually changes?
The obvious difference is distance, but the more useful difference is what starts limiting your performance. As races get longer, pure speed matters less and durability, fueling, pacing and comfort matter more.
| Factor | Sprint | Olympic | 70.3 | Full |
|---|---|---|---|---|
| Pacing | High sustainable intensity | Controlled hard effort | Long-course restraint | Very conservative early execution |
| Fueling | Usually simple | Useful but manageable | Major performance variable | Central race strategy |
| Bike comfort | Helpful | Important | Very important | Critical |
| Run durability | Speed-biased | Speed + endurance | Half-marathon after long ride | Marathon after 180 km bike |
| Weekly commitment | Lowest of the four | Moderate | High | Highest |
The training principle is still the same: you need to swim, bike and run consistently. What changes is how much volume you need, how long the key sessions become and how much race-specific practice matters. Our guide to balancing swimming, cycling and running is useful before you simply add more hours.
The bike dominates course distance — but that does not mean it should dominate every training decision
In a Sprint and Olympic triathlon, the bike makes up about 77.7% of the total course distance. In 70.3 and full distance it is about 79.6%. That helps explain why bike pacing, aerodynamics and comfort have such a large influence on long-course racing.
But distance share is not the same as training importance. Swimming has a technical and safety component, while the run produces high musculoskeletal stress. Your weekly balance should reflect your weaknesses, durability and race goal rather than copying the race-distance percentages.
Use race distance to shape specificity, not to assign training volume mechanically.
What is the best triathlon distance for beginners?
For most first-time triathletes, Sprint is the best starting distance. It is long enough to teach real triathlon pacing and transition skills, but short enough that you do not need long-course fueling experience or extremely long weekend sessions.
Especially useful if open-water confidence or training time is currently limited.
The best all-round first-race choice for learning the sport without making endurance the entire challenge.
A realistic first race for runners, cyclists or swimmers who can build all three disciplines consistently.
The race can be your first triathlon, but the cost of mistakes in pacing, fueling, swimming confidence and training consistency is much larger.
If you are undecided, do not choose based on prestige. Choose the shortest distance that still excites you and that fits your current life. Completing a Sprint well gives you more useful triathlon experience than entering a full distance you cannot train for consistently.
How much training do you need for each triathlon distance?
There is no universal number of weekly hours. Two athletes preparing for the same distance can need very different training because of experience, speed, injury history, swim skill and available time. What changes predictably is the need for longer key sessions as the race gets longer.
Consistency first
Learn all three sports, practice transitions and build enough endurance to complete each leg comfortably.
More aerobic volume
Longer swims, rides and runs start to matter, while quality sessions still have a strong place.
Long-course practice
Long rides, bricks, race fueling and sustainable pacing become regular parts of preparation.
Durability project
Training must build the ability to stay functional for a very long day while recovering well enough to repeat the work.
For more detail, compare how long it takes to train for a triathlon with our guide to weekly triathlon training hours. Use triathlon training zones to control intensity rather than making every session moderately hard.
Does course profile matter as much as triathlon distance?
Yes. Two races with the same official distance can have very different difficulty and finish times. When comparing events, look beyond the number of kilometres.
- Swim environment: pool, lake, river and ocean swimming create different technical and safety demands.
- Bike elevation: a hilly 40 km course can be slower and more fatiguing than a flat 40 km course.
- Wind: exposed bike courses can dramatically change speed at the same power.
- Heat and humidity: longer races magnify cooling, hydration and pacing problems.
- Road surface and turns: technical courses reduce average speed even if fitness is identical.
- Transition layout: a long run through transition adds real time that is not shown in the headline race distance.
This is why comparing finish times across unrelated races can be misleading. If you want context for what counts as a strong result, see what is a good triathlon time?
Do you need different gear for longer triathlon distances?
You do not need an entirely different sport for every distance. A safe bike, helmet, suitable swim equipment and running shoes can take you through a wide range of events. Longer races simply increase the value of comfort, storage and fueling solutions.
Short course
- Simple setup can be fastest.
- Fueling requirements are smaller.
- Transition speed matters more relative to total race time.
Long course
- Aerodynamic comfort matters for hours.
- Carrying fluids and carbohydrates becomes essential.
- Chafing, fit and small equipment problems have more time to become major problems.
Whatever the distance, rehearse race-day equipment before the event. Use the triathlon race-day checklist to avoid discovering a missing item in transition.
Common mistakes when choosing a triathlon distance
Choosing by status
A longer race is not automatically a better race. The right distance is the one you can prepare for consistently and enjoy.
Ignoring the swim
A strong cyclist or runner can still be limited by open-water confidence. Respect the first discipline before increasing race distance.
Underestimating long-course fueling
A 70.3 or full race is long enough that nutrition is part of performance, not an optional extra.
Comparing courses only by kilometres
Elevation, wind, water conditions and temperature can matter more than a small difference in measured distance.
Skipping brick practice
The run starts after cycling, not from fresh legs. Learn the sensation before race day with triathlon brick workouts.
Not checking event rules
Course cutoffs, wetsuit rules, drafting rules and transition procedures vary. Read the official race information rather than assuming.
Triathlon distance glossary
World Triathlon reference format: 400 m swim, 10 km bike, 2.5 km run.
750 m swim, 20 km bike, 5 km run.
1.5 km swim, 40 km bike, 10 km run.
World Triathlon lists 2.5 km, 80 km and 20 km; independent events may use the term differently.
1.2-mile swim, 56-mile bike, 13.1-mile run; total 70.3 miles.
2 km swim, 80 km bike, 18 km run; exactly 100 km total.
World Triathlon reference format: 4 km swim, 120 km bike, 30 km run.
2.4-mile swim, 112-mile bike and marathon; total 140.6 miles.
Frequently asked questions about triathlon distances
What are the main triathlon distances?
The best-known formats are Super Sprint, Sprint, Olympic or Standard, middle-distance formats, IRONMAN 70.3 and full distance. T100 is a 100 km format made up of a 2 km swim, 80 km bike and 18 km run.
How long is a Sprint triathlon?
A standard Sprint triathlon is a 750 m swim, 20 km bike and 5 km run, for about 25.75 km or 16 miles of racing before transition movement.
How long is an Olympic triathlon?
Olympic or Standard distance is a 1.5 km swim, 40 km bike and 10 km run, totaling 51.5 km or roughly 32 miles.
How long is a half Ironman or IRONMAN 70.3?
An IRONMAN 70.3 is a 1.2-mile swim, 56-mile bike and 13.1-mile run. In metric units that is approximately 1.9 km, 90 km and 21.1 km.
How long is a full IRONMAN triathlon?
A full IRONMAN is a 2.4-mile swim, 112-mile bike and 26.2-mile run, totaling 140.6 miles. Metric equivalents are approximately 3.8 km, 180 km and 42.2 km.
Is middle distance the same as 70.3?
Not necessarily. World Triathlon lists Middle distance as 2.5 km swimming, 80 km cycling and 20 km running, while IRONMAN 70.3 uses 1.9 km, 90 km and 21.1 km. Some independent races use “middle distance” more broadly.
What is the easiest triathlon distance for beginners?
Super Sprint is shorter, but Sprint is the most common all-round beginner recommendation because it gives you a full triathlon experience without the training and fueling demands of long-course racing.
Can an Olympic triathlon be your first triathlon?
Yes. An Olympic-distance event can be a realistic first triathlon if you already have a solid endurance base and can prepare consistently for a 1.5 km swim, 40 km bike and 10 km run.
What order do you swim, bike and run in a triathlon?
Triathlons are completed swim first, then bike, then run. T1 is the swim-to-bike transition and T2 is the bike-to-run transition.
Are all Sprint and Olympic triathlons exactly the same distance?
No. The standard reference distances are widely used, but local courses can vary because of geography, road access, permits and transition placement. Check the official course map for the race you enter.
How do I estimate my triathlon finish time?
Estimate each discipline from your realistic swim pace, bike speed and run pace, then add T1 and T2. The Triathlon Race Time Calculator does this for Sprint, Olympic, 70.3, full and custom distances.
Which triathlon distance should I choose?
Choose based on your current swim confidence, endurance background, weekly training time and motivation. For most new athletes, Sprint is the most practical starting point; long-course racing makes more sense when you specifically want the longer preparation project.
How we defined the distances in this guide
This guide separates governing-body reference distances from branded race formats and from looser terminology used by independent events.
World Triathlon
Super Sprint, Sprint, Standard, Middle, T100 and Long reference distances were checked against World Triathlon's current age-group distance table.
IRONMAN
70.3 and full-distance mile figures were checked against official IRONMAN explanations of the two branded formats.
T100
The current 2 km swim, 80 km bike and 18 km run format was checked against T100 event information.
Estimate your own triathlon finish time
Distance is only the first part of the equation. Add your realistic swim pace, bike speed, run pace and transition times to see how your race could come together.
Sources
- World Triathlon — The Sport of Triathlon: Age Group
Super Sprint, Sprint, Standard, Middle, T100, Long and IRONMAN reference distances.
- IRONMAN — How Do I Know if I’m Ready for an IRONMAN 70.3?
1.2-mile swim, 56-mile bike, 13.1-mile run and 70.3-mile total.
- IRONMAN — How Do I Know if I’m Ready to Do an IRONMAN?
2.4-mile swim, 112-mile bike, 26.2-mile run and 140.6-mile total.
- T100 — 100 km Triathlon Race Information
2 km swim, 80 km bike and 18 km run T100 format.
New to the sport? The Triathlon Handbook for Beginners brings training, gear and race-day fundamentals together in one practical resource.
Continue planning with our complete set of triathlon calculators and race-planning tools. You can also browse all of Triathlon Loop’s free endurance tools.
If 70.3 is your next distance, use our complete Half Ironman training guide to assess readiness and build weekly volume, long sessions, bricks, fueling and pacing.
