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Dark Downs 50k Pacing Calculator
Dusk till dawn on the South Downs, in one of England's darkest skies.
Distance
50 km
50km
Total climb
1341m
official D+
Total descent
1341m
official D−
High / low
243m
low 33m
100m200m
University of Sussex, Falmer
Saddlescombe Farm
Saddlescombe Farm (2nd pass)9:00:00
Ditchling Beacon11:00:00
0km10km20km30km40km50km
Your goal
Goal type
:
hrsmin
Pacing strategy
Constant effort start to finish.
Pacing splits · Even effort
| Section | Length | Target pace | VAM | Vert | GAP | Elapsed |
|---|---|---|---|---|---|---|
| 0m–4.9km | 4.9km | 11:40/km | 10m/hr | +10m | 11:17/km | 57:15 |
| 4.9km–6.8km | 1.9km | 17:02/km | 262m/hr | +141m | 11:17/km | 1:29:32 |
| 6.8km–7.7km | 930m | 9:48/km | — | −26m | 11:17/km | 1:38:40 |
| 7.7km–9.7km | 1.9km | 10:31/km | — | −31m | 11:17/km | 1:58:58 |
1University of Sussex, Falmer Arrive1:58:58☀ 8:28 PM Rest 2min Leave2:00:58☾ 8:30 PM No cutoff | ||||||
| 9.7km–11.0km | 1.3km | 9:33/km | — | −49m | 11:17/km | 2:13:44 |
| 11.0km–12.1km | 1.1km | 15:33/km | 223m/hr | +65m | 11:17/km | 2:31:13 |
| 12.1km–17.6km | 5.5km | 12:13/km | 21m/hr | +23m | 11:17/km | 3:37:59 |
| 17.6km–18.5km | 919m | 11:01/km | — | −5m | 11:17/km | 3:48:07 |
| 18.5km–20.6km | 2.1km | 8:42/km | — | −108m | 11:17/km | 4:06:48 |
| 20.6km–21.9km | 1.2km | 15:27/km | 210m/hr | +66m | 11:17/km | 4:25:42 |
| 21.9km–24.1km | 2.3km | 12:07/km | 47m/hr | +22m | 11:17/km | 4:53:21 |
2Saddlescombe Farm Arrive4:53:21☾ 11:23 PM Rest 2min Leave4:55:21☾ 11:25 PM No cutoff | ||||||
| 24.1km–25.9km | 1.7km | 13:58/km | 104m/hr | +42m | 11:17/km | 5:19:44 |
| 25.9km–28.3km | 2.4km | 8:45/km | — | −123m | 11:17/km | 5:40:38 |
| 28.3km–31.0km | 2.7km | 14:32/km | 192m/hr | +125m | 11:17/km | 6:19:48 |
| 31.0km–33.9km | 2.9km | 10:14/km | — | −123m | 11:17/km | 6:49:25 |
| 33.9km–35.4km | 1.6km | 18:09/km | 283m/hr | +133m | 11:17/km | 7:17:38 |
3Saddlescombe Farm (2nd pass) Arrive7:17:38☾ 1:47 AM +1d Rest 2min Leave7:19:38☾ 1:49 AM +1d Cutoff 9:00:00+1:42:22 | ||||||
| 35.4km–37.0km | 1.6km | 8:09/km | — | −113m | 11:17/km | 7:32:38 |
| 37.0km–38.2km | 1.2km | 15:14/km | 217m/hr | +65m | 11:17/km | 7:50:36 |
| 38.2km–39.1km | 925m | 7:25/km | — | −85m | 11:17/km | 7:57:28 |
| 39.1km–40.6km | 1.5km | 17:23/km | 256m/hr | +112m | 11:17/km | 8:23:40 |
| 40.6km–42.8km | 2.2km | 12:44/km | 88m/hr | +42m | 11:17/km | 8:52:10 |
| 42.8km–44.7km | 1.9km | 11:24/km | — | −9m | 11:17/km | 9:13:41 |
| 44.7km–45.9km | 1.1km | 9:21/km | — | −63m | 11:17/km | 9:24:17 |
4Ditchling Beacon Arrive9:24:17☾ 3:54 AM +1d Rest 2min Leave9:26:17☾ 3:56 AM +1d Cutoff 11:00:00+1:35:43 | ||||||
| 45.9km–47.6km | 1.7km | 8:57/km | — | −90m | 11:17/km | 9:41:35 |
| 47.6km–50.0km | 2.4km | 10:53/km | — | −21m | 11:17/km | 10:08:00 |
GAP is grade-adjusted pace, the flat-equivalent pace for the effort. On an even-effort plan it stays roughly constant while your actual target pace rises on climbs and falls on descents. Switch to “By terrain” to pace the course by its climbs and descents. The highlighted rows are aid stations: edit your rest with the ± steppers and every arrival, departure and the 8:00 of total stopped time folds into the elapsed clock. The cutoff badge shows your buffer against the official cutoff at arrival. The ☀/☾ is the wall-clock hour from the official 6:30 PM start, so you know when to expect a headlamp.