About this tool
The Triathlon Split & Finish-Time Calculator sums your swim, first transition (T1), bike, second transition (T2) and run times into a total finish time, and shows the pace and percentage of the race each leg takes. Preset distances cover Sprint (0.75 / 20 / 5 km), Olympic (1.5 / 40 / 10), 70.3 (1.9 / 90 / 21.0975) and Ironman (3.8 / 180 / 42.195), or you can enter your own. All maths is plain addition done in your browser.
Each leg is also broken down: swim pace is time ÷ (distance ÷ 100 m); bike speed is distance ÷ time in km/h (or mph); run pace is time ÷ distance per km (or mile). The share of total is simply leg time ÷ total × 100, which quickly shows where your race is won or lost — for most athletes the bike and run dominate while transitions are a small but often-neglected slice.
An optional goal-finish box works backwards: enter a target total and the tool holds your swim, bike and transition times fixed and returns the run time and pace you would need to hit the goal (goal − swim − bike − T1 − T2). If that leaves no time, it flags the goal as out of reach. Switch between metric and imperial for the bike and run outputs.