Flat grade share
- Thames Meander Marathon (London) Half Marathon
- 69.4% Favoured
Thames Meander Marathon (London) Half Marathon vs Thames Meander Marathon (London) 10K
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofThames Meander Marathon (London) Half Marathon or Thames Meander Marathon (London) 10K — which comes out ahead?
Thames Meander Marathon (London) Half Marathon has the stronger available profile on flat grade share and course flatness.
Route comparison snapshot
Thames Meander Marathon (London) Half Marathon
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 0.5% Favoured
- flat grade share
- 69.4% Favoured
- lower ascent
- 159 m
- climbing density
- 7.6 m/km
- net elevation
- 0 m
- maximum grade
- 6.5%
Thames Meander Marathon (London) 10K
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 0.5%
- flat grade share
- 68.7%
- lower ascent
- 78 m
- climbing density
- 7.8 m/km
- net elevation
- 0 m
- maximum grade
- 6.5%
| Metric | Thames Meander Marathon (London) Half Marathon | Thames Meander Marathon (London) 10K |
|---|---|---|
| Flat grade share | 69.4% ✓ | 68.7% |
| GAP factor (% slower than flat) | 0.5% ✓ | 0.5% |
| Uphill share | 15.1% | 15.5% |
| Steep-up share | 0.2% | 0.2% |
| Downhill share | 15.4% | 15.8% |
| Total ascent (m) | 159 m | 78 m |
| Climbing density (m/km) | 7.6 m/km | 7.8 m/km |
| Longest climb length (m) | 360 m | 350 m |
| Longest climb gain (m) | 7 m | 7 m |
| Longest climb average grade | 2.0% | 2.0% |
| Total descent (m) | 159 m | 77 m |
| Net elevation (m) | 0 m | 0 m |
| Max absolute grade | 6.5% | 6.5% |
| Start elevation (m) | 12 m | 12 m |
| Finish elevation (m) | 12 m | 12 m |
| Scenic score | 64/100 | 64/100 |
| Conditions | 36/100 | 36/100 |
GAP factor (% slower than flat)
- Thames Meander Marathon (London) Half Marathon
- 0.5% Favoured
Uphill share
Steep-up share
Downhill share
Total ascent (m)
Climbing density (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
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 | Thames Meander Marathon (London) Half Marathon | Thames Meander Marathon (London) 10K |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2026-08-09 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2026-08-09 (legacy event-level date). |
| Location | Barnes, London | Barnes, London |
| Actual distance | 21.1 km | 10 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Course type | Out And Back | Out And Back |
| Terrain | Road, Trail | Road, Trail |
| Scenery | Riverside, Waterfront, Parkland, City | Riverside, Waterfront, Parkland, City |
| Atmosphere | Scenic Tour, Community | Scenic Tour, Community |
| Total ascent | 159 m | 78 m |
| Climbing density | 7.6 m/km | 7.8 m/km |
| Total descent | 159 m | 77 m |
| Net elevation | 0 m | 0 m |
| Max absolute grade | 6.5% | 6.5% |
| Flat grade share | 69.4% | 68.7% |
| GAP factor | 0.5% | 0.5% |
| Cutoff | 6:00:00 | 3:15:00 |
| Entry model | Open | Open |
| Measured course | Yes | Yes |
Schedule
- Thames Meander Marathon (London) Half Marathon
Exact race date not confirmed. Event weekend starts 2026-08-09 (legacy event-level date).
- Thames Meander Marathon (London) 10K
Exact race date not confirmed. Event weekend starts 2026-08-09 (legacy event-level date).
Location
- Thames Meander Marathon (London) Half Marathon
- Barnes, London
- Thames Meander Marathon (London) 10K
- Barnes, London
Actual distance
- Thames Meander Marathon (London) Half Marathon
- 21.1 km
- Thames Meander Marathon (London) 10K
- 10 km
raceindex.org mapped route held
- Thames Meander Marathon (London) Half Marathon
- Held
- Thames Meander Marathon (London) 10K
- Held
raceindex.org elevation profile held
- Thames Meander Marathon (London) Half Marathon
- Held
- Thames Meander Marathon (London) 10K
- Held
Course type
- Thames Meander Marathon (London) Half Marathon
- Out And Back
- Thames Meander Marathon (London) 10K
- Out And Back
Terrain
- Thames Meander Marathon (London) Half Marathon
- Road, Trail
- Thames Meander Marathon (London) 10K
- Road, Trail
Scenery
- Thames Meander Marathon (London) Half Marathon
- Riverside, Waterfront, Parkland, City
- Thames Meander Marathon (London) 10K
- Riverside, Waterfront, Parkland, City
Atmosphere
- Thames Meander Marathon (London) Half Marathon
- Scenic Tour, Community
- Thames Meander Marathon (London) 10K
- Scenic Tour, Community
Total ascent
- Thames Meander Marathon (London) Half Marathon
- 159 m
- Thames Meander Marathon (London) 10K
- 78 m
Climbing density
- Thames Meander Marathon (London) Half Marathon
- 7.6 m/km
- Thames Meander Marathon (London) 10K
- 7.8 m/km
Total descent
- Thames Meander Marathon (London) Half Marathon
- 159 m
- Thames Meander Marathon (London) 10K
- 77 m
Net elevation
- Thames Meander Marathon (London) Half Marathon
- 0 m
- Thames Meander Marathon (London) 10K
- 0 m
Max absolute grade
- Thames Meander Marathon (London) Half Marathon
- 6.5%
- Thames Meander Marathon (London) 10K
- 6.5%
Flat grade share
- Thames Meander Marathon (London) Half Marathon
- 69.4%
- Thames Meander Marathon (London) 10K
- 68.7%
GAP factor
- Thames Meander Marathon (London) Half Marathon
- 0.5%
- Thames Meander Marathon (London) 10K
- 0.5%
Cutoff
- Thames Meander Marathon (London) Half Marathon
- 6:00:00
- Thames Meander Marathon (London) 10K
- 3:15:00
Entry model
- Thames Meander Marathon (London) Half Marathon
- Open
- Thames Meander Marathon (London) 10K
- Open
Measured course
- Thames Meander Marathon (London) Half Marathon
- Yes
- Thames Meander Marathon (London) 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, Thames Meander Marathon (London) Half Marathon or Thames Meander Marathon (London) 10K?
Thames Meander Marathon (London) Half Marathon has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.