Triathlon Pace Calculator
— Swim, Bike & Run Splits
Enter your swim pace, bike speed and run pace to predict your finish time for any triathlon distance — from Sprint to Ironman. Includes T1 and T2 transitions, age-group benchmarks and race-day pacing tips.
Predict your triathlon finish time before race day
A triathlon combines three disciplines — swimming, cycling and running — separated by two transition zones. Your finish time is the sum of all five segments: Swim + T1 + Bike + T2 + Run. Missing any single estimate can cost you minutes on race day.
Our triathlon pace calculator lets you model different effort levels across disciplines and instantly see how trade-offs affect your total time. Go 2 km/h faster on the bike — does it help or hurt if it ruins your run? Now you’ll know before you toe the start line.
Supports Sprint (750m/20km/5km), Olympic (1.5km/40km/10km), 70.3 Half Ironman (1.9km/90km/21.1km) and Full Ironman (3.8km/180km/42.2km) distances — plus custom values for any race format.
The biggest triathlon pacing mistakes
- 01Going out too hard on the swim and blowing up early
- 02Over-biking — arriving at T2 with nothing left to run
- 03Underestimating T1/T2 and losing 5+ minutes to fumbling
- 04Using pool pace for open-water swim estimate (add 5–10%)
Key triathlon terms
- T1
- First transition — swim exit to mounting the bike
- T2
- Second transition — dismounting the bike to running
- Brick run
- A run immediately off the bike — legs feel heavy for 1–2 km
- DNF / DNS
- Did Not Finish / Did Not Start — often from pacing errors
How the triathlon time formula works
Your finish time = Swim + T1 + Bike + T2 + Run. Each segment has its own formula. Here’s exactly what goes into each calculation.
Swim Time
Divide the swim distance by 100, then multiply by your pace in seconds per 100m.
× Pace_seconds
Bike Time
Divide the bike distance in kilometres by your average speed in km/h, then convert to hours:minutes:seconds.
(result in hours)
Run Time
Multiply the run distance in kilometres by your pace in seconds per kilometre.
× Pace_seconds_per_km
Total Finish Time
Sum all five segments — swim, T1, bike, T2 and run — to get your predicted finish time.
+ T2 + Run
Open Water Adjustment
Add 5–10% to your pool pace for open-water triathlon swims to account for sighting, chop and no-wall turns.
(typical 7% slowdown)
Transition Time
Each transition is simply added in seconds — don’t underestimate them. T1 and T2 together can cost 3–10 minutes.
times in MM:SS
Triathlon finish time benchmarks by distance
How do you compare? These are typical finish-time ranges across ability levels for the four main triathlon distances.
| Distance | Swim | Bike | Run | Beginner | Intermediate | Elite / AG |
|---|---|---|---|---|---|---|
| Sprint (750m/20km/5km) | 750 m | 20 km | 5 km | 1:15–1:45 | 0:55–1:10 | 0:45–0:55 |
| Olympic (1.5km/40km/10km) | 1.5 km | 40 km | 10 km | 2:30–3:30 | 2:00–2:30 | 1:45–2:00 |
| 70.3 Half Ironman | 1.9 km | 90 km | 21.1 km | 5:30–7:30 | 4:30–5:30 | 3:45–4:20 |
| Ironman (Full) | 3.8 km | 180 km | 42.2 km | 12:00–16:00 | 10:00–12:00 | 8:00–9:30 |
Times in H:MM format. Beginner = first or second triathlon. AG = Age-Group podium finisher. Data aggregated from WTC, British Triathlon and age-group results 2019–2024.
Pacing tips to hit your predicted triathlon time
A finish-time prediction is only useful if your pacing strategy gets you there. Here are eight proven race-day tactics.
Seed yourself correctly at the swim start
Start 30–60 seconds after the fastest group. Getting boxed in slows your swim and costs more than the wait time. Most mass swims now allow self-seeding by estimated pace.
Swim to the edge of your aerobic zone
Target roughly 80% of maximum heart rate — hard enough to be efficient, not so hard you blow up your bike and run. For most people this is around Zone 3–4.
Practise transitions in training
Even one brick-session in full gear — wet suit off, helmet on, shoes clipped — can save 60–90 seconds on race day. T1/T2 are the only “free speed” in triathlon.
Use the first 5 km of the bike to recover
Resist the urge to hammer as soon as you mount the bike. Let your heart rate settle, get nutrition in, and then build into your target power or pace.
Pace the bike at 70–75% of FTP for Ironman
For Olympic and Sprint the effort can be higher (85–90% of FTP), but in a 70.3 or Ironman going above 75% consistently nearly always wrecks your run.
Expect the first 2 km of the run to feel bad
“Brick legs” are normal — the heavy, sluggish feeling after dismounting fades around km 2. Don’t panic and don’t sprint to compensate. Settle into your planned pace.
Negative split the run
Start the run 15–20 sec/km slower than goal pace and build. Athletes who try to run their goal pace from the gun consistently blow up in the final 3–5 km.
Hydrate and fuel before you’re thirsty or hungry
Start drinking in the first 20 minutes of the bike and take on calories (30–60g carbohydrate/hour) throughout. Dehydration and bonking account for most triathlon DNFs.
Real questions from triathletes
Common questions answered with the directness you’d get from a coach, not a textbook.
Triathlon pace calculator — frequently asked questions
Related swim & triathlon calculators
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Convert between time, distance and pace. Get splits for any pool or open-water race distance.
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Plan even, negative or positive splits lap-by-lap for any swim race distance and pool size.
Plan splitsOpen Water Calculator
Adjust your pool pace for water temperature, chop, currents, sighting and wetsuit to predict OWS race time.
Estimate OW timeSwim Time Converter
Convert times between 25m, 50m pools and yards. Adjust for Course Conversion Factor (CCF).
Convert times