Triathlon Pace Calculator

World Triathlon recognizes four main distances. Sprint: 750m swim, 20km bike, 5km run. Olympic: 1,500m swim, 40km bike, 10km run. Half (also called 70.3 or Half Ironman): 1,900m swim, 90km bike, 21.1km run. Full (Ironman): 3,800m swim, 180km bike, 42.2km run. The names 'Ironman' and '70.3' are trademarks of the World Triathlon Corporation (WTC/Ironman), but the distances are recognized standards in the sport. Super sprint (shorter) and ultra-distance variations also exist but are less standardized.

T1 (Transition 1) is the transition from the swim segment to the bike segment. Athletes must exit the water, remove their wetsuit, put on their helmet (mandatory before touching the bike), and start cycling. T1 times typically range from 1 to 5 minutes depending on experience and race setup. T2 (Transition 2) is the transition from the bike segment to the run segment. Athletes rack their bike, remove their helmet, switch shoes, and begin running. T2 is usually faster than T1, often 1 to 3 minutes. Both transitions count toward the official race finish time.

For first-time triathletes completing a sprint distance, a finish time between 1 hour 15 minutes and 1 hour 45 minutes is typical. For Olympic distance first-timers, 2 hours 30 minutes to 3 hours 30 minutes is a reasonable range. For a Half Ironman first attempt, most first-timers finish between 5 and 7 hours. For a full Ironman, finishing under the 17-hour cutoff is the first goal for beginners, with typical finisher times of 11 to 14 hours for age-group athletes. Elite professionals complete sprint triathlons in under 55 minutes and full Ironman events in under 8 hours.

The bike segment is where most triathletes lose time through going too hard, which compromises the run. A common rule of thumb is to hold back on the bike to around 75 to 80% of your maximum effort (using perceived exertion or heart rate), saving energy for the run. For longer events (Half and Full), the run is where competitors separate: over-biking is the most common pacing mistake. In this calculator, you enter your expected average bike speed in km/h. For most age-group athletes, realistic bike speeds are 25 to 35 km/h for Sprint and Olympic, and 28 to 35 km/h for longer events with good bike fitness.

Transitions are often called the 'fourth discipline' of triathlon because they are a trainable skill that directly affects finish time. Efficient transitions require practice: setting up your transition area systematically, practicing wetsuit removal, and practicing flying mounts and dismounts for the bike. For Sprint and Olympic distances, elite athletes complete transitions in under 60 seconds. For Age Group athletes, 2 to 4 minutes per transition is realistic. In a Half or Full Ironman, transitions may include a change of clothes, adding time. This calculator lets you enter your expected T1 and T2 times in minutes.