Flat grade share
- St Albans Half Marathon 10K
- 56.8% Favoured
St Albans Half Marathon 5K vs St Albans Half Marathon 10K
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofSt Albans Half Marathon 5K or St Albans Half Marathon 10K — which comes out ahead?
St Albans Half Marathon 10K has the stronger available profile on flat grade share and course flatness.
Route comparison snapshot
St Albans Half Marathon 5K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 1.7%
- flat grade share
- 35.5%
- lower ascent
- 84 m
- climbing density
- 16.8 m/km
- net elevation
- -5 m
- maximum grade
- 8.9%
St Albans Half Marathon 10K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 1.0% Favoured
- flat grade share
- 56.8% Favoured
- lower ascent
- 97 m
- climbing density
- 9.7 m/km
- net elevation
- 0 m
- maximum grade
- 6.9%
| Metric | St Albans Half Marathon 5K | St Albans Half Marathon 10K |
|---|---|---|
| Flat grade share | 35.5% | 56.8% ✓ |
| GAP factor (% slower than flat) | 1.7% | 1.0% ✓ |
| Uphill share | 33.1% | 21.4% |
| Steep-up share | 7.6% | 3.6% |
| Downhill share | 31.4% | 21.7% |
| Total ascent (m) | 84 m | 97 m |
| Climbing density (m/km) | 16.8 m/km | 9.7 m/km |
| Longest climb length (m) | 740 m | 1,120 m |
| Longest climb gain (m) | 29 m | 37 m |
| Longest climb average grade | 3.9% | 3.3% |
| Total descent (m) | 89 m | 97 m |
| Net elevation (m) | -5 m | 0 m |
| Max absolute grade | 8.9% | 6.9% |
| Start elevation (m) | 82 m | 77 m |
| Finish elevation (m) | 77 m | 78 m |
| Scenic score | 60/100 | 60/100 |
| Conditions | 73/100 | 73/100 |
GAP factor (% slower than flat)
- St Albans Half Marathon 10K
- 1.0% Favoured
Uphill share
Steep-up share
Downhill share
Total ascent (m)
Climbing density (m/km)
- St Albans Half Marathon 5K
- 16.8 m/km
- St Albans Half Marathon 10K
- 9.7 m/km
Longest climb length (m)
- St Albans Half Marathon 10K
- 1,120 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
Conditions
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 | St Albans Half Marathon 5K | St Albans Half Marathon 10K |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2027-06-13 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2027-06-13 (legacy event-level date). |
| Location | St Albans, East Of England | St Albans, East Of England |
| Actual distance | 5 km | 10 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Course type | Loop | Unavailable |
| Terrain | Trail | Trail |
| Scenery | Parkland, Lakeside, Historic, Countryside | Parkland, Lakeside, Historic, Countryside |
| Atmosphere | Community, Festival | Community, Festival |
| Total ascent | 84 m | 97 m |
| Climbing density | 16.8 m/km | 9.7 m/km |
| Total descent | 89 m | 97 m |
| Net elevation | -5 m | 0 m |
| Max absolute grade | 8.9% | 6.9% |
| Flat grade share | 35.5% | 56.8% |
| GAP factor | 1.7% | 1.0% |
| Field cap | 600 | 2,500 |
| Entry model | Open | Open |
Schedule
- St Albans Half Marathon 5K
Exact race date not confirmed. Event weekend starts 2027-06-13 (legacy event-level date).
- St Albans Half Marathon 10K
Exact race date not confirmed. Event weekend starts 2027-06-13 (legacy event-level date).
Location
- St Albans Half Marathon 5K
- St Albans, East Of England
- St Albans Half Marathon 10K
- St Albans, East Of England
Actual distance
- St Albans Half Marathon 5K
- 5 km
- St Albans Half Marathon 10K
- 10 km
raceindex.org mapped route held
- St Albans Half Marathon 5K
- Held
- St Albans Half Marathon 10K
- Held
raceindex.org elevation profile held
- St Albans Half Marathon 5K
- Held
- St Albans Half Marathon 10K
- Held
Course type
- St Albans Half Marathon 5K
- Loop
- St Albans Half Marathon 10K
- Unavailable
Terrain
- St Albans Half Marathon 5K
- Trail
- St Albans Half Marathon 10K
- Trail
Scenery
- St Albans Half Marathon 5K
- Parkland, Lakeside, Historic, Countryside
- St Albans Half Marathon 10K
- Parkland, Lakeside, Historic, Countryside
Atmosphere
- St Albans Half Marathon 5K
- Community, Festival
- St Albans Half Marathon 10K
- Community, Festival
Total ascent
- St Albans Half Marathon 5K
- 84 m
- St Albans Half Marathon 10K
- 97 m
Climbing density
- St Albans Half Marathon 5K
- 16.8 m/km
- St Albans Half Marathon 10K
- 9.7 m/km
Total descent
- St Albans Half Marathon 5K
- 89 m
- St Albans Half Marathon 10K
- 97 m
Net elevation
- St Albans Half Marathon 5K
- -5 m
- St Albans Half Marathon 10K
- 0 m
Max absolute grade
- St Albans Half Marathon 5K
- 8.9%
- St Albans Half Marathon 10K
- 6.9%
Flat grade share
- St Albans Half Marathon 5K
- 35.5%
- St Albans Half Marathon 10K
- 56.8%
GAP factor
- St Albans Half Marathon 5K
- 1.7%
- St Albans Half Marathon 10K
- 1.0%
Field cap
- St Albans Half Marathon 5K
- 600
- St Albans Half Marathon 10K
- 2,500
Entry model
- St Albans Half Marathon 5K
- Open
- St Albans Half Marathon 10K
- Open
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, St Albans Half Marathon 5K or St Albans Half Marathon 10K?
St Albans Half Marathon 10K has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.