Race Time Predictor
How fast will you run Marathon-eXperience?
Marathon-eXperience race stats pre-loaded (39.74 km, 1,869 m D+). Enter a known race result to get an elevation-adjusted finish time estimate.
39.74km1,869m D+Winner: ~3h14Cutoff: 8h10
Full MaXi-Race Marathon-eXperience course data: aid stations, cutoffs, course profile
- ✓Your race (done)
- 2About you
- 3Your finish
1Your race
- The course
39.7 km, but it costs 68 km-effort. The 1,912 m of descent is where legs go.
2How should we estimate you?
Start with
Pick whichever you have. After your first estimate we ask for the other - two inputs give a firmer read.
Same as gain. Edit if different.
Hours, or h:mm
- TrailMath
Got a UTMB index? Hand it over, it's the straightest read I get. No index? A long, hilly past race works too.
3 · Your predicted finish
58 km-effort (ITRA, gain only)68 km-effort
Add a past race or your index to get a finish time.
Marathon-eXperience finish times by UTMB Index
Predicted finish on the Marathon-eXperience course (39.7 km, 1,869 m D+) for each UTMB Index, with the margin to the 8h10 cutoff.
| UTMB Index | Predicted finish | Average pace | Margin to cutoff |
|---|---|---|---|
| 850 | 3h16 | 4:56 /km7:56 /mi | +4h54 |
| 800 | 3h34 | 5:23 /km8:40 /mi | +4h36 |
| 750 | 3h54 | 5:53 /km9:29 /mi | +4h16 |
| 700competitive | 4h16 | 6:26 /km10:22 /mi | +3h54 |
| 650 | 4h40 | 7:02 /km11:20 /mi | +3h31 |
| 600 | 5h06 | 7:42 /km12:23 /mi | +3h04 |
| 550 | 5h34 | 8:25 /km13:32 /mi | +2h36 |
| 500mid-pack | 6h05 | 9:12 /km14:48 /mi | +2h05 |
| 450 | 6h39 | 10:03 /km16:10 /mi | +1h31 |
| 400back of the pack | 7h16 | 10:59 /km17:41 /mi | +0h54 |
| 350 | 7h57 | 12:00 /km19:19 /mi | +0h13 |
| 300 | 8h42 | 13:07 /km21:07 /mi | 0h31 past the cutoff |
The 8h10 cutoff sits at about Index 335. The typical winning time, 3h14, sits at about Index 856. At the 2026 edition, the median of the 1,259 finishers took 5h36, about Index 546. A model estimate, not an official ITRA or UTMB figure.
From a result you already have
What the predictor gives on Marathon-eXperience for a few common reference results.
| Road marathon | 3h00 → 5h23 | 3h30 → 6h17 | 4h00 → 7h10 | 4h30 → 8h04 |
|---|---|---|---|---|
| 50 km trail, 2,000 m D+ | 5h30 → 4h29 | 6h30 → 5h18 | 7h30 → 6h07 | 8h30 → 6h56 |
Road marathons use the tool's rougher power-law fallback.
Marathon-eXperience course in numbers
- Climbing per kmClimbing per mile
- 47 m248 ft
- ITRA km-effort
- 58 (50K)
- Highest point
- 1,696 m5,564 ft
- Biggest climb
- +551 m over 6.3 km at 8.5%+1,808 ft over 3.9 mi at 8.5%
- Steepest climb
- +116 m over 0.8 km at 14.8%+381 ft over 0.5 mi at 14.8%
- Longest descent
- -642 m over 6.8 km at 9.3%-2,106 ft over 4.2 mi at 9.3%
- Track climbing above 3%
- 42%
- Winning time / cutoff
- 3h14 / 8h10 (2.5x the winner's time)
Section-by-section climbs, descents and grades are on the Marathon-eXperience course page.
Predict your Marathon-eXperience finish time from a reference race result, adjusted for the course's 39.74 km and roughly 1,869 m of elevation gain. The overall cutoff is 8h10.
About MaXi-Race Marathon-eXperience
MaXi-Race Marathon-eXperience covers 39.74 km with around 1,869 m of elevation gain, starting in Annecy, France. The overall cutoff is 8 hours 10 minutes.
Crew access is allowed at Base vie Semnoz (in) (17.9 km) and Base vie Semnoz (out) (18.31 km). Drop bags are available at Base vie Semnoz (in) and Base vie Semnoz (out).
Checkpoint data approximate - verify against the current official race guide at maxi-race.org before your race.
How the prediction works
Your result becomes a UTMB Index, mapped onto Marathon-eXperience by the calibrated model behind the ITRA / UTMB Index Estimator. Full methodology.
Build a training plan targeted at your Marathon-eXperience goal time
TrailMath uses these models to build periodized plans adjusted to your goals and terrain.
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