Triathlon Calculator — Finish Time, Split & Calorie Estimator
Select your triathlon distance (or enter custom), input your expected paces and transitions, and get a full breakdown of finish time and estimated calorie expenditure per discipline.
Triathlon distance
min / 100 m
km/h
min / km
min
min
kg
2:55:43 total • ≈1,709 kcal
- 1
Swim time
(1.5 km × 10) × 2 min/100 m = 30 - 2
Bike time
40 km ÷ 28 km/h × 60 = 85.7 - 3
Run time
10 km × 5.5 min/km = 55 - 4
Total finish time
30 + 3 + 85.7 + 2 + 55 = 176Swim + T1 + Bike + T2 + Run, in minutes.
How does this calculator work?
Triathlon total time = swim + T1 + bike + T2 + run, where swim = (distance/100 m) × pace, bike = (distance/speed) × 60, run = distance × pace. Calorie burn ≈ MET × body weight × hours per segment. Enter paces and transitions for a full split and calorie breakdown.
Formula
How this is calculated
Each triathlon leg is timed independently. Swim time: the distance in 100-metre intervals multiplied by your pace per 100 m. Bike time: distance divided by average speed in km/h, converted to minutes. Run time: distance in km multiplied by pace per km. Two transition times (T1 and T2) are added as flat estimates.
Calorie burn is estimated using MET (Metabolic Equivalent of Task) values — approximately 8 METs for swimming, 8 METs for cycling at moderate pace, and 9.8 METs for running — multiplied by body weight in kg and duration in hours: kcal ≈ MET × kg × h. MET values vary with intensity; the figures here correspond to moderate age-group efforts and are rough guidelines rather than clinical measurements.
For custom events, enter any swim, bike and run distances. Open-water swim pace is usually 5–15% slower than pool pace, and triathlon run pace is typically 10–30% slower than a standalone run due to prior fatigue. Enter conservative estimates for race-day prediction.
Frequently asked questions
The estimate uses fixed MET values (8 for swim and bike, 9.8 for run) and body weight. Individual metabolism, fitness level, terrain, heat and intensity all shift real calorie burn 10–30% in either direction. Use it for rough planning — not as a precise nutrition target.
Sprint and Olympic athletes typically take 1–4 min for T1 and 1–3 min for T2. Half-Ironman and Ironman transitions run longer (3–8 min each) due to changing rooms, sunscreen and additional gear. Practice transitions in training to tighten these numbers — they are free speed on race day.
Triathlon running follows a fatigued swim and bike. Research consistently shows athletes run 10–30% slower than their fresh running pace, especially in longer events where the bike leg depletes glycogen and stresses the legs. Brick training (bike-to-run sessions) helps adapt the body and narrow this gap.
Also known as
TG we-Calculate Editorial Team. (2026). Triathlon Calculator — Finish Time, Split & Calorie Estimator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/triathlon-calculator
TG we-Calculate Editorial Team. "Triathlon Calculator — Finish Time, Split & Calorie Estimator." TG we-Calculate. 2026. https://we-calculate.com/calculator/triathlon-calculator.
TG we-Calculate Editorial Team, "Triathlon Calculator — Finish Time, Split & Calorie Estimator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/triathlon-calculator
@misc{wecalculate_triathlon_calculator, title = {Triathlon Calculator — Finish Time, Split & Calorie Estimator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/triathlon-calculator}}, year = {2026}, note = {TG we-Calculate} }
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