Triathlon Pace Calculator
Time Breakdown
Show the math
Swim time = (distance ÷ 100) × pace per 100. Bike time = distance ÷ speed. Run time = distance × pace per km/mi. Total time sums all three legs plus T1/T2 transitions. Related: swim pace, running pace.
What Your Result Means
- Total Time: Your predicted race finish time, including both transitions. This is a best-case estimate assuming steady paces — real races involve pacing shifts, terrain, and fatigue.
- Leg Times: Individual swim, bike, and run durations based on your entered pace or speed. Compare these to identify which discipline has the most room for improvement.
- T1 and T2: Transition times from swim-to-bike and bike-to-run. Experienced triathletes typically keep each under 2–3 minutes; beginners may take 5–10 minutes.
- Time Breakdown (%): Shows how much of your total race time each leg consumes. In most triathlons, the bike takes the largest share (roughly 50%), followed by the run (30–35%), then swim and transitions.
How This Calculator Works
You enter distances for swim, bike, and run along with pace (swim per 100m/yd, run per km/mile) and average bike speed. Swim time = (distance ÷ 100) × pace per 100. Bike time = distance ÷ speed. Run time = distance × pace per unit. Transitions are added in minutes. The tool sums all five segments for total time and calculates each leg's percentage share.
Quick Questions
What are the standard triathlon distances?
Sprint: 750m swim, 20km bike, 5km run. Olympic: 1.5km swim, 40km bike, 10km run. Half Ironman (70.3): 1.9km swim, 90km bike, 21.1km run. Full Ironman: 3.86km swim, 180km bike, 42.2km run.
How long should transitions take?
Competitive athletes often complete T1 (swim to bike) in 2–4 minutes and T2 (bike to run) in 1–2 minutes. Beginners should budget 5–8 minutes per transition. Practicing transitions reduces race-day time.
How do I estimate my swim pace per 100m?
Swim a timed 400m in a pool and divide total seconds by 4 to get your per-100m pace. Open water is typically 5–15% slower than pool pace due to sighting, currents, and drafting.
Should I pace all three legs evenly?
Most coaches recommend a conservative swim, steady bike at 75–80% effort, and progressively faster run. Going too hard on the bike is the most common pacing mistake in triathlon.
Does this account for elevation or drafting?
No. The calculator uses flat, steady-state arithmetic. Hilly courses, wind, drafting (in draft-legal races), and nutrition strategy all affect real finish times significantly.
Sources
- World Triathlon — Competition Rules (official race distances and regulations)
- Ironman — Triathlon Training (race distances and pacing guidelines)
- Wikipedia — Triathlon (history, race formats, and standard distances)
Method & review
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.