Triathlon Run Pace Calculator
Calculate your triathlon run pace.
Convert run time to pace per km or mile and predict finish time for Sprint, Olympic, or Ironman run legs.
The run is the final discipline in triathlon, and it is run on legs that have already done a swim and a bike. Triathlon run pace typically comes out 15 to 45 seconds per km slower than a standalone running race over the same distance.
Standard triathlon run distances:
- Sprint: 5 km
- Olympic: 10 km
- Half Ironman (70.3): 21.1 km
- Ironman: 42.2 km (full marathon)
Pace formula: Pace per km = total run time (seconds) / distance (km)
Worked example: Olympic run (10 km) in 52 minutes (3,120 seconds): Pace = 3,120 / 10 = 312 seconds = 5:12 per km
Estimating your triathlon run pace: A common formula: triathlon run pace = standalone race pace × 1.05 to 1.15 (5–15% slower)
If your 10 km standalone PB is 48 minutes (4:48/km), expect 50–55 minutes in triathlon.
Pacing strategy: Run the first kilometre conservatively. It takes 800 to 1,500 m for the legs to change over from cycling, and going out hard in that window buys you a much slower second half. Even pacing, or a slight negative split, produces the fastest overall run.
Ironman run: In a full Ironman, heart rate control is critical. Most athletes run at 65–75% of max heart rate to avoid burning out before kilometer 30.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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