Flat grade share
- Southampton Marathon 5K
- 88.8% Favoured
Southampton Marathon 5K 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 ofSouthampton Marathon 5K or Southampton Marathon 10K — which comes out ahead?
Southampton Marathon 5K and Southampton Marathon 10K split the available advantages, so the better choice depends on which metric matters most to the runner.
Route comparison snapshot
Southampton Marathon 5K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 1.7%
- flat grade share
- 88.8% Favoured
- lower ascent
- 26 m
- climbing density
- 5.2 m/km
- net elevation
- 14 m
- maximum grade
- 4.3%
Southampton Marathon 10K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 1.4% Favoured
- flat grade share
- 76.8%
- lower ascent
- 70 m
- climbing density
- 7.0 m/km
- net elevation
- 14 m
- maximum grade
- 13.8%
| Metric | Southampton Marathon 5K | Southampton Marathon 10K |
|---|---|---|
| Flat grade share | 88.8% ✓ | 76.8% |
| GAP factor (% slower than flat) | 1.7% | 1.4% ✓ |
| Uphill share | 8.2% | 13.4% |
| Steep-up share | 0.0% | 1.6% |
| Downhill share | 2.9% | 9.7% |
| Total ascent (m) | 26 m | 70 m |
| Climbing density (m/km) | 5.2 m/km | 7.0 m/km |
| Longest climb length (m) | 300 m | 750 m |
| Longest climb gain (m) | 6 m | 17 m |
| Longest climb average grade | 2.1% | 2.2% |
| Total descent (m) | 12 m | 56 m |
| Net elevation (m) | 14 m | 14 m |
| Max absolute grade | 4.3% | 13.8% |
| Start elevation (m) | 3 m | 3 m |
| Finish elevation (m) | 18 m | 18 m |
| Scenic score | 86/100 | 86/100 |
| Conditions | 87/100 | 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)
- Southampton Marathon 5K
- 5.2 m/km
- Southampton Marathon 10K
- 7.0 m/km
Longest climb length (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
- Southampton Marathon 5K
- 86/100
- Southampton Marathon 10K
- 86/100
Conditions
- Southampton Marathon 5K
- 87/100
- Southampton Marathon 10K
- 87/100
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.
Same-distance comparisons are most meaningful; cross-distance metrics are contextual.
Race facts that change the decision
| Fact | Southampton Marathon 5K | Southampton Marathon 10K |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2027-05-02 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2027-05-02 (legacy event-level date). |
| Location | Southampton, South East | Southampton, South East |
| Actual distance | 5 km | 10 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Scenery | City, Coastal, Historic, Parkland, Waterfront, Riverside | City, Coastal, Historic, Parkland, Waterfront, Riverside |
| Atmosphere | Big City, Festival, Community | Big City, Festival, Community |
| Total ascent | 26 m | 70 m |
| Climbing density | 5.2 m/km | 7.0 m/km |
| Total descent | 12 m | 56 m |
| Net elevation | 14 m | 14 m |
| Max absolute grade | 4.3% | 13.8% |
| Flat grade share | 88.8% | 76.8% |
| GAP factor | 1.7% | 1.4% |
| Cutoff | 2:00:00 | 2:00:00 |
| Entry model | Open | Open |
| Measured course | Yes | Yes |
Schedule
- Southampton Marathon 5K
Exact race date not confirmed. Event weekend starts 2027-05-02 (legacy event-level date).
- Southampton Marathon 10K
Exact race date not confirmed. Event weekend starts 2027-05-02 (legacy event-level date).
Location
- Southampton Marathon 5K
- Southampton, South East
- Southampton Marathon 10K
- Southampton, South East
Actual distance
- Southampton Marathon 5K
- 5 km
- Southampton Marathon 10K
- 10 km
raceindex.org mapped route held
- Southampton Marathon 5K
- Held
- Southampton Marathon 10K
- Held
raceindex.org elevation profile held
- Southampton Marathon 5K
- Held
- Southampton Marathon 10K
- Held
Scenery
- Southampton Marathon 5K
- City, Coastal, Historic, Parkland, Waterfront, Riverside
- Southampton Marathon 10K
- City, Coastal, Historic, Parkland, Waterfront, Riverside
Atmosphere
- Southampton Marathon 5K
- Big City, Festival, Community
- Southampton Marathon 10K
- Big City, Festival, Community
Total ascent
- Southampton Marathon 5K
- 26 m
- Southampton Marathon 10K
- 70 m
Climbing density
- Southampton Marathon 5K
- 5.2 m/km
- Southampton Marathon 10K
- 7.0 m/km
Total descent
- Southampton Marathon 5K
- 12 m
- Southampton Marathon 10K
- 56 m
Net elevation
- Southampton Marathon 5K
- 14 m
- Southampton Marathon 10K
- 14 m
Max absolute grade
- Southampton Marathon 5K
- 4.3%
- Southampton Marathon 10K
- 13.8%
Flat grade share
- Southampton Marathon 5K
- 88.8%
- Southampton Marathon 10K
- 76.8%
GAP factor
- Southampton Marathon 5K
- 1.7%
- Southampton Marathon 10K
- 1.4%
Cutoff
- Southampton Marathon 5K
- 2:00:00
- Southampton Marathon 10K
- 2:00:00
Entry model
- Southampton Marathon 5K
- Open
- Southampton Marathon 10K
- Open
Measured course
- Southampton Marathon 5K
- Yes
- 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, Southampton Marathon 5K 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.