Race Time Predictor

How fast will you run EcoTrail Paris 120?

EcoTrail Paris 120 race stats pre-loaded (120.1 km, 2,000 m D+). Enter a known race result to get an elevation-adjusted finish time estimate.

120.1km2,000m D+Winner: ~8h56Cutoff: 21h25

Full EcoTrail Paris - Trail 120 km course data: aid stations, cutoffs, course profile

120.1 kmdistance2,000 mD+2,117 mD-151km-effort

GentleSteadySteepVery steep

Your race (done)
About you
Your finish

1Your race

EcoTrail Paris 120Official course loaded · 120.1 km · 2,000 m D+Different race?

Have the GPX? Measure the exact course in the GPX Explorer

The course
120.1 km, but it costs 151 km-effort. The 2,117 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.

Distance (km)

Elevation gain (m)

Elevation loss (m)

Same as gain. Edit if different.

Finish time

Hours, or h:mm

From my Strava historyYour last 90 days of real training. Opens the TrailMath app.Read-only access to your activities. Nothing is posted to Strava, and no training plan is created until you ask for one.

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

140 km-effort (ITRA, gain only)151 km-effort

Add a past race or your index to get a finish time.

EcoTrail Paris 120 finish times by UTMB Index

Predicted finish on the EcoTrail Paris 120 course (120.1 km, 2,000 m D+) for each UTMB Index, with the margin to the 21h25 cutoff.

EcoTrail Paris 120: predicted finish time by UTMB Index
UTMB Index	Predicted finish	Average pace	Margin to cutoff
850	8h39	4:19 /km6:57 /mi	+12h47
800	9h27	4:43 /km7:36 /mi	+11h58
750	10h20	5:10 /km8:18 /mi	+11h05
700competitive	11h17	5:38 /km9:05 /mi	+10h08
650	12h21	6:10 /km9:55 /mi	+9h05
600	13h29	6:44 /km10:51 /mi	+7h56
550	14h45	7:22 /km11:51 /mi	+6h40
500mid-pack	16h07	8:03 /km12:58 /mi	+5h18
450	17h37	8:48 /km14:10 /mi	+3h48
400back of the pack	19h16	9:37 /km15:29 /mi	+2h10
350	21h03	10:31 /km16:56 /mi	+0h22
300	23h01	11:30 /km18:30 /mi	1h36 past the cutoff

The 21h25 cutoff sits at about Index 340. The typical winning time, 8h56, sits at about Index 832. At the 2026 edition, the median of the 1,212 finishers took 16h45, about Index 478. A model estimate, not an official ITRA or UTMB figure.

From a result you already have

What the predictor gives on EcoTrail Paris 120 for a few common reference results.

EcoTrail Paris 120: predicted finish from reference results
Road marathon	3h00 → 14h16	3h30 → 16h38	4h00 → 19h01	4h30 → 21h23
50 km trail, 2,000 m D+	5h30 → 11h53	6h30 → 14h03	7h30 → 16h12	8h30 → 18h21

Road marathons use the tool's rougher power-law fallback.

To prepare each checkpoint, use the EcoTrail Paris 120 aid station planner.

EcoTrail Paris 120 course in numbers

Climbing per kmClimbing per mile: 17 m88 ft
ITRA km-effort: 140 (100K)
Highest point: 181 m594 ft
Biggest climb: +114 m over 2.0 km at 4.7%+374 ft over 1.2 mi at 4.7%
Longest descent: -101 m over 5.8 km at 1.2% (through Saint-Cloud - Manufacture)-331 ft over 3.6 mi at 1.2% (through Saint-Cloud - Manufacture)
Track climbing above 3%: 15%
Winning time / cutoff: 8h56 / 21h25 (2.4x the winner's time)

Section-by-section climbs, descents and grades are on the EcoTrail Paris 120 course page.

Predict your EcoTrail Paris 120 finish time from a reference race result, adjusted for the course's 120.1 km and roughly 2,000 m of elevation gain. The overall cutoff is 21h25.

About EcoTrail Paris - Trail 120 km

EcoTrail Paris - Trail 120 km covers 120.1 km with around 2,000 m of elevation gain, starting in Château de Rambouillet, Rambouillet, France. The overall cutoff is 21 hours 25 minutes.

Crew access is allowed at Etangs de Hollande (16.7 km), Château de la Madeleine (54.9 km), Golf National (Saint-Quentin-en-Yvelines) (66.4 km), Buc - Château (75.6 km), Chaville - Stade Jean-Jaurès (88.3 km), Meudon - Marcel Bec (95.7 km) and Saint-Cloud - Manufacture (111.1 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 120 by the calibrated model behind the ITRA / UTMB Index Estimator. Full methodology.

Build a training plan targeted at your EcoTrail Paris 120 goal time

TrailMath uses these models to build periodized plans adjusted to your goals and terrain.

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