Triathlon finish time calculator
Sprint to full distance, from your swim, bike speed or power, and run.
Your finish time will appear here.
How this is worked out
The finish time
Swim + first transition + bike + second transition + run. Each leg is its distance at the pace or speed you enter. It uses your numbers as you type them, so enter race paces rather than your best for a stand-alone event.
The distances
Sprint: 750 m swim, 20 km bike, 5 km run. Olympic: 1500 m swim, 40 km bike, 10 km run. 70.3: 1900 m swim, 90 km bike, 21.1 km run. Full: 3800 m swim, 180 km bike, 42.2 km run.
Bike speed from power
Power = speed x (rolling resistance + air drag) / drivetrain efficiency. Rolling resistance is total weight x 9.80665 x 0.004, and air drag is 0.5 x 1.225 x 0.27 x speed squared. We solve that for your speed.
What that assumes
A flat course, no wind, a good aero position on a tri bike (CdA 0.27 m²), rolling resistance of 0.004, air density of 1.225 kg/m³, 97% drivetrain efficiency and 9 kg of bike and kit unless you enter yours. Hills, wind and a less aero position will be slower.