About the Triathlon Time Calculator
This triathlon time calculator adds up a race leg by leg. Choose a sprint, Olympic, half-Ironman (70.3) or full Ironman distance — or enter your own — then give your expected swim pace per 100, average bike speed, run pace and how long you expect to spend in T1 and T2. You get a predicted finish time, each split, and a running clock at the end of every leg.
It is built for planning: setting realistic goals for your first race, seeing which discipline costs you the most time, and checking how much a faster transition or a 1 km/h quicker bike split would really save. The pie chart shows how your race time divides between the three sports.
Use paces you can hold on race day, not training bests — open-water swims with sighting are usually slower than pool pace, and your long-course run will be slower than a fresh standalone run. Course hills, wind and heat all add time beyond what any calculator can know.
With the default inputs, the predicted finish time is 2h 46m 30s. Change any value above to recalculate instantly.
How to use the triathlon time calculator
- 1Choose metric or imperial pace units.
- 2Pick a race distance, or Custom to enter your own.
- 3Enter your expected swim pace, bike speed and run pace for race day.
- 4Add realistic T1 and T2 transition times.
- 5Read your finish time, splits and race clock at each leg.
Formula and method
Each leg is distance multiplied by pace (or divided by speed for the bike). Swim pace is per 100 m, or per 100 yards in imperial mode, so the swim distance is converted to yards (1 yd = 0.9144 m) before multiplying. Bike and run distances are converted to miles (1 mile = 1.609344 km) when you use mph and minutes per mile.
Standard distances used are sprint 750 m / 20 km / 5 km, Olympic 1.5 km / 40 km / 10 km, 70.3 1.9 km / 90 km / 21.1 km and Ironman 3.8 km / 180.2 km / 42.2 km. Real courses vary slightly from these, and the prediction assumes you hold an even pace in every leg.
- Swim pace
- Time per 100 m (or 100 yd)
- Speed
- Average bike speed in km/h or mph
- Run pace
- Time per km or per mile
- T1, T2
- Transition times
Worked examples
Olympic: 2:00/100 m, 30 km/h, 5:15/km
Swim 15 × 2:00 = 30:00, bike 40 km at 30 km/h = 1:20:00, run 10 × 5:15 = 52:30, plus 4 minutes of transitions = 2:46:30.
Ironman in imperial units: 2:00/100 yd, 18 mph, 10:00/mile
3.8 km is 4,155.7 yd, so the swim is 41.56 × 2:00 ≈ 1:23:07. 180.2 km is 111.97 miles, 6:13:14 at 18 mph. The 26.22-mile run at 10:00/mile is 4:22:11. With 10 minutes of transitions the finish is about 12:08:32.
Sprint: 1:45/100 m, 32 km/h, 4:45/km
Swim 7.5 × 1:45 = 13:08, bike 20 km at 32 km/h = 37:30, run 5 × 4:45 = 23:45, plus 2:30 in transition — about 1:16:53.
Frequently asked questions
What is a good Olympic triathlon time?+
Many age-group finishers complete an Olympic-distance race in roughly 2:30 to 3:30. Competitive age-groupers often go under 2:15, and elite athletes finish in under two hours on fast courses.
How long does an Ironman take?+
Most age-group athletes finish a full Ironman in about 11 to 15 hours. Race cut-offs are usually 17 hours total, with intermediate cut-offs for the swim (around 2:20) and bike.
How long should triathlon transitions take?+
In sprint and Olympic races, experienced athletes spend about 1–3 minutes in each transition. Long-course transitions are often 3–8 minutes because athletes change more gear and use changing tents.
Should I use my pool swim pace?+
Expect to be slower in open water. Sighting, waves, currents and no walls to push off usually add 5–10 seconds per 100, though a wetsuit can offset some of that.
How do I estimate my triathlon run pace?+
Start from a recent standalone run race and slow it down: roughly 5–10% slower for an Olympic run, and considerably more for 70.3 and Ironman, where many athletes run 15–25% slower than their open marathon pace.