Triathlon Pacing Calculator - Goal Pace by Discipline

Solve the swim pace, bike speed, or run pace required to reach a triathlon goal after accounting for the other two disciplines and both transitions.

Solve for

Required: goal time, event distance, swim pace, bike speed, and both transitions.

Event distance

Custom swim distance

Swim distance unit

Custom bike distance

Bike distance unit

Custom run distance

Run distance unit

Goal finish time hours (h)

Goal finish time minutes (min)

Goal finish time seconds within the minute (s)

Known swim pace in minutes:seconds

Swim pace unit

Known bike speed

Bike speed unit

Known run pace in minutes:seconds

Run pace unit

First transition (T1) hours (h)

First transition (T1) minutes (min)

First transition (T1) seconds within the minute (s)

Second transition (T2) hours (h)

Second transition (T2) minutes (min)

Second transition (T2) seconds within the minute (s)

How the Goal-Pacing Solver Works

This calculator reserves time for both transitions and the two known disciplines, then assigns every remaining second to the discipline selected under Solve for. Unlike a race-time adder, it answers one planning question: what swim pace, bike speed, or run pace would make the entered finish goal possible?

Inputs used for each solve mode
Solve target	Known discipline inputs	Primary output
Swim pace	Bike speed and run pace	Time per 100 m and 100 yd
Bike speed	Swim pace and run pace	km/h and mph
Run pace	Swim pace and bike speed	Time per km and mile

Formula

Available discipline time equals goal time minus T1, T2, and both known discipline times. Swim pace divides that remainder by the number of 100-meter lengths. Bike speed divides bike distance by the remaining hours. Run pace divides the remainder by run distance.

Worked Standard-Distance Example

For a 2:30:00 goal, a 30:00 swim, 1:20:00 bike, 3:00 T1, and 2:00 T2 leave 35:00 for the 10 km run. That requires 3:30 per kilometer, equivalent to 5:37.962 per mile. The checkpoint rows extend the solved target to useful intermediate distances.

Unit Handling

Each pace or speed control names its actual unit next to the value. A pace entered per 100 yards is converted to a per-100-meter basis for calculation, miles per hour are converted to kilometers per hour, and minutes per mile are converted to seconds per kilometer. Results show both systems.

Assumptions and Limitations

The schedule holds each entered or solved pace constant over its discipline. It does not model hills, currents, wind, aid-station stops, fatigue, penalties, or course-specific distance differences. A goal that leaves no positive time for the selected discipline is rejected instead of returning an impossible pace.

Sources

World Triathlon, World Triathlon Competition Rules, 2026. IRONMAN, IRONMAN and IRONMAN 70.3 official race distances, 2026.