Race Time Predictor
How fast will you run EcoTrail Paris 45?
EcoTrail Paris 45 race stats pre-loaded (47.1 km, 780 m D+). Enter a known race result to get an elevation-adjusted finish time estimate.
47.1km780m D+Winner: ~2h59Cutoff: 8h20
Full EcoTrail Paris - Trail 45 km course data: aid stations, cutoffs, course profile
- ✓Your race (done)
- 2About you
- 3Your finish
1Your race
- The course
47.1 km, but it costs 59 km-effort. The 867 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
55 km-effort (ITRA, gain only)59 km-effort
Add a past race or your index to get a finish time.
EcoTrail Paris 45 finish times by UTMB Index
Predicted finish on the EcoTrail Paris 45 course (47.1 km, 780 m D+) for each UTMB Index, with the margin to the 8h20 cutoff.
| UTMB Index | Predicted finish | Average pace | Margin to cutoff |
|---|---|---|---|
| 850 | 2h45 | 3:30 /km5:37 /mi | +5h35 |
| 800 | 3h00 | 3:49 /km6:09 /mi | +5h20 |
| 750 | 3h17 | 4:11 /km6:43 /mi | +5h03 |
| 700competitive | 3h35 | 4:34 /km7:21 /mi | +4h45 |
| 650 | 3h55 | 4:59 /km8:02 /mi | +4h25 |
| 600 | 4h17 | 5:27 /km8:47 /mi | +4h03 |
| 550 | 4h41 | 5:58 /km9:36 /mi | +3h39 |
| 500mid-pack | 5h07 | 6:31 /km10:29 /mi | +3h13 |
| 450 | 5h36 | 7:07 /km11:28 /mi | +2h44 |
| 400back of the pack | 6h07 | 7:47 /km12:32 /mi | +2h13 |
| 350 | 6h41 | 8:31 /km13:42 /mi | +1h39 |
| 300 | 7h18 | 9:18 /km14:58 /mi | +1h02 |
The 8h20 cutoff sits at about Index 226. The typical winning time, 2h59, sits at about Index 801. At the 2026 edition, the median of the 1,769 finishers took 5h17, about Index 482. A model estimate, not an official ITRA or UTMB figure.
From a result you already have
What the predictor gives on EcoTrail Paris 45 for a few common reference results.
| Road marathon | 3h00 → 4h33 | 3h30 → 5h18 | 4h00 → 6h04 | 4h30 → 6h49 |
|---|---|---|---|---|
| 50 km trail, 2,000 m D+ | 5h30 → 3h46 | 6h30 → 4h28 | 7h30 → 5h09 | 8h30 → 5h50 |
Road marathons use the tool's rougher power-law fallback.
EcoTrail Paris 45 course in numbers
- Climbing per kmClimbing per mile
- 17 m87 ft
- ITRA km-effort
- 55 (50K)
- Highest point
- 181 m594 ft
- Biggest climb
- +95 m over 1.4 km at 6.4%+312 ft over 0.9 mi at 6.4%
- Steepest climb
- +63 m over 0.5 km at 13.2%+207 ft over 0.3 mi at 13.2%
- Longest descent
- -87 m over 4.4 km at 1.6% (through Saint-Cloud - Manufacture)-285 ft over 2.7 mi at 1.6% (through Saint-Cloud - Manufacture)
- Track climbing above 3%
- 17%
- Winning time / cutoff
- 2h59 / 8h20 (2.8x the winner's time)
Section-by-section climbs, descents and grades are on the EcoTrail Paris 45 course page.
Predict your EcoTrail Paris 45 finish time from a reference race result, adjusted for the course's 47.1 km and roughly 780 m of elevation gain. The overall cutoff is 8h20.
About EcoTrail Paris - Trail 45 km
EcoTrail Paris - Trail 45 km covers 47.1 km with around 780 m of elevation gain, starting in Gardens of the Château de Versailles, Versailles, France. The overall cutoff is 8 hours 20 minutes.
Crew access is allowed at Chaville - Stade Jean-Jaurès (20.7 km) and Saint-Cloud - Manufacture (38.1 km).
Checkpoint data approximate - verify against the current official race guide at ecotrailparis.com before your race.
How the prediction works
Your result becomes a UTMB Index, mapped onto EcoTrail Paris 45 by the calibrated model behind the ITRA / UTMB Index Estimator. Full methodology.
Build a training plan targeted at your EcoTrail Paris 45 goal time
TrailMath uses these models to build periodized plans adjusted to your goals and terrain.
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