Flat grade share
- Southampton Marathon 10K
- 76.8% Favoured
Beachy Head Marathon 10K vs Southampton Marathon 10K
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofBeachy Head Marathon 10K or Southampton Marathon 10K — which comes out ahead?
Southampton Marathon 10K has the stronger available profile on flat grade share, course flatness and conditions.
Route comparison snapshot
Beachy Head Marathon 10K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 5.0%
- flat grade share
- 20.3%
- lower ascent
- 244 m
- climbing density
- 24.4 m/km
- net elevation
- 1 m
- maximum grade
- 18.7%
Southampton Marathon 10K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 1.4% Favoured
- flat grade share
- 76.8% Favoured
- lower ascent
- 70 m
- climbing density
- 7.0 m/km
- net elevation
- 14 m
- maximum grade
- 13.8%
| Metric | Beachy Head Marathon 10K | Southampton Marathon 10K |
|---|---|---|
| Flat grade share | 20.3% | 76.8% ✓ |
| GAP factor (% slower than flat) | 5.0% | 1.4% ✓ |
| Uphill share | 36.7% | 13.4% |
| Steep-up share | 14.2% | 1.6% |
| Downhill share | 42.9% | 9.7% |
| Total ascent (m) | 244 m | 70 m |
| Climbing density (m/km) | 24.4 m/km | 7.0 m/km |
| Longest climb length (m) | 1,240 m | 750 m |
| Longest climb gain (m) | 99 m | 17 m |
| Longest climb average grade | 7.9% | 2.2% |
| Total descent (m) | 242 m | 56 m |
| Net elevation (m) | 1 m | 14 m |
| Max absolute grade | 18.7% | 13.8% |
| Start elevation (m) | 50 m | 3 m |
| Finish elevation (m) | 52 m | 18 m |
| Scenic score | 98/100 ✓ | 86/100 |
| Conditions | 67/100 | 87/100 ✓ |
GAP factor (% slower than flat)
- Southampton Marathon 10K
- 1.4% Favoured
Uphill share
Steep-up share
Downhill share
Total ascent (m)
Climbing density (m/km)
- Beachy Head Marathon 10K
- 24.4 m/km
- Southampton Marathon 10K
- 7.0 m/km
Longest climb length (m)
- Beachy Head Marathon 10K
- 1,240 m
Longest climb gain (m)
Longest climb average grade
Total descent (m)
Net elevation (m)
Max absolute grade
Start elevation (m)
Finish elevation (m)
Scenic score
- Beachy Head Marathon 10K
- 98/100 Favoured
- Southampton Marathon 10K
- 86/100
Conditions
- Beachy Head Marathon 10K
- 67/100
- Southampton Marathon 10K
- 87/100 Favoured
Only metrics available for at least one side are shown. A ✓ marks the better value for each metric (higher-is-better aware). Scores are out of 100 when available. Ascent, climbing density, max absolute grade and median finish describe course or field context and are not marked as better or worse.
Race facts that change the decision
| Fact | Beachy Head Marathon 10K | Southampton Marathon 10K |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2026-10-24 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2027-05-02 (legacy event-level date). |
| Location | Eastbourne, South East | Southampton, South East |
| Actual distance | 10 km | 10 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Terrain | Road | Unavailable |
| Scenery | Coastal, Parkland, Countryside, Forest, Riverside, Waterfront | City, Coastal, Historic, Parkland, Waterfront, Riverside |
| Atmosphere | Scenic Tour, Destination | Big City, Festival, Community |
| Total ascent | 244 m | 70 m |
| Climbing density | 24.4 m/km | 7.0 m/km |
| Total descent | 242 m | 56 m |
| Net elevation | 1 m | 14 m |
| Max absolute grade | 18.7% | 13.8% |
| Flat grade share | 20.3% | 76.8% |
| GAP factor | 5.0% | 1.4% |
| Cutoff | 2:00:00 | 2:00:00 |
| Entry model | Open | Open |
| Measured course | Unavailable | Yes |
Schedule
- Beachy Head Marathon 10K
Exact race date not confirmed. Event weekend starts 2026-10-24 (legacy event-level date).
- Southampton Marathon 10K
Exact race date not confirmed. Event weekend starts 2027-05-02 (legacy event-level date).
Location
- Beachy Head Marathon 10K
- Eastbourne, South East
- Southampton Marathon 10K
- Southampton, South East
Actual distance
- Beachy Head Marathon 10K
- 10 km
- Southampton Marathon 10K
- 10 km
raceindex.org mapped route held
- Beachy Head Marathon 10K
- Held
- Southampton Marathon 10K
- Held
raceindex.org elevation profile held
- Beachy Head Marathon 10K
- Held
- Southampton Marathon 10K
- Held
Terrain
- Beachy Head Marathon 10K
- Road
- Southampton Marathon 10K
- Unavailable
Scenery
- Beachy Head Marathon 10K
- Coastal, Parkland, Countryside, Forest, Riverside, Waterfront
- Southampton Marathon 10K
- City, Coastal, Historic, Parkland, Waterfront, Riverside
Atmosphere
- Beachy Head Marathon 10K
- Scenic Tour, Destination
- Southampton Marathon 10K
- Big City, Festival, Community
Total ascent
- Beachy Head Marathon 10K
- 244 m
- Southampton Marathon 10K
- 70 m
Climbing density
- Beachy Head Marathon 10K
- 24.4 m/km
- Southampton Marathon 10K
- 7.0 m/km
Total descent
- Beachy Head Marathon 10K
- 242 m
- Southampton Marathon 10K
- 56 m
Net elevation
- Beachy Head Marathon 10K
- 1 m
- Southampton Marathon 10K
- 14 m
Max absolute grade
- Beachy Head Marathon 10K
- 18.7%
- Southampton Marathon 10K
- 13.8%
Flat grade share
- Beachy Head Marathon 10K
- 20.3%
- Southampton Marathon 10K
- 76.8%
GAP factor
- Beachy Head Marathon 10K
- 5.0%
- Southampton Marathon 10K
- 1.4%
Cutoff
- Beachy Head Marathon 10K
- 2:00:00
- Southampton Marathon 10K
- 2:00:00
Entry model
- Beachy Head Marathon 10K
- Open
- Southampton Marathon 10K
- Open
Measured course
- Beachy Head Marathon 10K
- Unavailable
- Southampton Marathon 10K
- Yes
Facts are shown only when they exist in the sourced race record; Not held means no sourced value is held for that race.
Common questions
Which is flatter, Beachy Head Marathon 10K or Southampton Marathon 10K?
Southampton Marathon 10K has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.