Duathlon Distances

The short answer

Official duathlon distances

Transcribed from Appendix A of the World Triathlon Competition Rules dated 18 January 2025. Note the phrase 'up to' on the sprint and super sprint rows: those are ceilings, not fixed distances, so two races with the same name can differ.

Source: World Triathlon Competition Rules, 18 January 2025, Appendix A (page 135). Individual races and series such as Powerman set their own distances.

Duathlon distances in miles

The same table converted for readers who plan in miles.

Converted at 1 km = 0.621371 miles and rounded to one decimal place.

The first run decides the race

Pacing targets from your standalone 5 km

If you can race a standalone 5 km in the time on the left, these are realistic targets for a sprint duathlon's two runs. The first-run column is deliberately conservative; the second-run range reflects a well-ridden bike at the fast end and a hard one at the slow end.

Run 1 adds 15-20 s/km to standalone pace; run 2 adds a further 20-25 s/km on top of run 1. Model your own race with the duathlon calculator.

Duathlon compared with triathlon

• No swim, so no open-water anxiety. This is why duathlon is often recommended as a first multisport race for runners and cyclists who have not learned to swim.
• Much higher impact load. Two runs with a hard bike between them is a heavier session for your legs than a triathlon of similar duration, and it needs more recovery afterwards.
• Transitions matter more. Sprint duathlons are short, so the two transitions are a large share of the total - the same arithmetic that makes transitions worth practising for sprint triathlon.
• Weather sometimes turns triathlons into duathlons. When a swim is cancelled for wind, cold or water quality, races commonly convert to a run-bike-run format at short notice, so knowing how to pace one is useful even if you never enter one deliberately.

Frequently asked questions

What are the distances in a duathlon?

A standard duathlon is either 5 km run, 30 km bike, 5 km run or 10 km run, 40 km bike, 5 km run - World Triathlon's rules list both as official Standard distance. A sprint duathlon is up to 5 km, up to 20 km and up to 2.5 km. The order is always run, bike, run.

How long is a sprint duathlon?

Up to 5 km running, up to 20 km cycling and up to 2.5 km running. Like sprint triathlon, the rules set a ceiling rather than a fixed distance, so individual races vary and you should check the specific event. Most take between one hour and 1:45.

Is a duathlon run-bike-run or bike-run?

Run, bike, run. The first run is usually longer than the second, and both transitions are timed as part of the race. A bike-run event without an opening run is a different format.

How long does a duathlon take?

A sprint duathlon typically takes an hour to 1:45 and a standard duathlon two to three hours depending on which of the two official standard formats the race uses. Because the standard distance has two versions, comparing finish times between duathlons is less meaningful than between Olympic triathlons.

How should I pace the first run in a duathlon?

Slower than you want to. The most common duathlon mistake is racing run 1 at open 5 km effort, which leaves you unable to ride hard and turns run 2 into damage control. Aim to run the first run about 15 to 20 seconds per kilometre slower than a standalone race of the same distance.

Why is the second run so much slower?

On a well-executed race, expect the second run to be about 20 to 25 seconds per kilometre slower than the first - that is the figure the pacing table above uses. If you over-raced the opening run or over-rode the bike it can easily stretch to 40 or 60 seconds per kilometre, which is the usual signature of a duathlon that went wrong. It is the same run-off-the-bike effect triathletes deal with, except that you arrive at it having already raced a run.

Is a duathlon harder than a triathlon?

It is harder on the legs and easier on the nerves. There is no swim to worry about, but running twice means the impact load is much higher and there is no low-impact leg to recover on. Runners tend to find duathlon more accessible; swimmers usually find it less forgiving.

What is Powerman?

Powerman is a long-distance duathlon race series, best known for Powerman Zofingen in Switzerland. Its distances are set by the series rather than by the World Triathlon table above, so check the specific event before planning.

Plan your duathlon