Race pace

Grindstone Trail Running Festival by UTMB pace calculator

21K · Sat, September 19, 2026 · 21 km · 500 m D+

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Race-day pacing plan

Set a finish target and stopped-time budget, then use the GPX-derived split table for where the course should feel slow or runnable.

Official cutoff
6h 00
Clock pace
14:34 / km
Finish time including stops.
Moving pace
14:11 / km
What your watch needs while moving.
Effort pace
11:28 / km
Uses climb and descent adjusted distance.
Cutoff buffer
+54 min
At the selected finish target.
Course from GPX
21.0 km
500 m D+ · 0 m D-
Adjusted workload
26.0 effort-km
100 m climb = 1 km; 300 m descent = 1 km.
Hardest block
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Split plan will appear below.

Course-aware split plan

Five-kilometer blocks from the GPX, weighted by climb and descent load.

Start 08:00