Flat grade share
- Cardiff Half Marathon
- Unavailable
Cardiff Half Marathon vs Mizuno Swansea Half Marathon
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofCardiff Half Marathon or Mizuno Swansea Half Marathon — which comes out ahead?
Cardiff Half Marathon and Mizuno Swansea Half Marathon split the available advantages, so the better choice depends on which metric matters most to the runner.
Route comparison snapshot
Cardiff Half Marathon
- Mapped route
- Not held
- Elevation profile
- Not held
- course flatness
- Unavailable
- flat grade share
- Unavailable
- lower ascent
- Unavailable
- climbing density
- Unavailable
- net elevation
- Unavailable
- maximum grade
- Unavailable
Mizuno Swansea Half Marathon
- Mapped route
- Held Favoured
- Elevation profile
- Held Favoured
- course flatness
- 0.1%
- flat grade share
- 96.0%
- lower ascent
- 44 m
- climbing density
- 2.1 m/km
- net elevation
- -0 m
- maximum grade
- 5.6%
| Metric | Cardiff Half Marathon | Mizuno Swansea Half Marathon |
|---|---|---|
| Flat grade share | Unavailable | 96.0% |
| GAP factor (% slower than flat) | Unavailable | 0.1% |
| Uphill share | Unavailable | 2.0% |
| Steep-up share | Unavailable | 0.0% |
| Downhill share | Unavailable | 2.0% |
| Total ascent (m) | Unavailable | 44 m |
| Climbing density (m/km) | Unavailable | 2.1 m/km |
| Longest climb length (m) | Unavailable | 410 m |
| Longest climb gain (m) | Unavailable | 9 m |
| Longest climb average grade | Unavailable | 2.3% |
| Total descent (m) | Unavailable | 44 m |
| Net elevation (m) | Unavailable | -0 m |
| Max absolute grade | Unavailable | 5.6% |
| Start elevation (m) | Unavailable | 8 m |
| Finish elevation (m) | Unavailable | 8 m |
| Value | 79/100 | Unavailable |
| Scenic score | 100/100 ✓ | 61/100 |
| Conditions | 76/100 | 77/100 ✓ |
| Entry fee (GBP) | £58 | Unavailable |
| Lowest modelled true cost (GBP) | £188 | Unavailable |
GAP factor (% slower than flat)
- Cardiff Half Marathon
- Unavailable
Uphill share
- Cardiff Half Marathon
- Unavailable
Steep-up share
- Cardiff Half Marathon
- Unavailable
Downhill share
- Cardiff Half Marathon
- Unavailable
Total ascent (m)
- Cardiff Half Marathon
- Unavailable
Climbing density (m/km)
- Cardiff Half Marathon
- Unavailable
- Mizuno Swansea Half Marathon
- 2.1 m/km
Longest climb length (m)
- Cardiff Half Marathon
- Unavailable
Longest climb gain (m)
- Cardiff Half Marathon
- Unavailable
Longest climb average grade
- Cardiff Half Marathon
- Unavailable
Total descent (m)
- Cardiff Half Marathon
- Unavailable
Net elevation (m)
- Cardiff Half Marathon
- Unavailable
Max absolute grade
- Cardiff Half Marathon
- Unavailable
Start elevation (m)
- Cardiff Half Marathon
- Unavailable
Finish elevation (m)
- Cardiff Half Marathon
- Unavailable
Value
- Cardiff Half Marathon
- 79/100
- Mizuno Swansea Half Marathon
- Unavailable
Scenic score
- Cardiff Half Marathon
- 100/100 Favoured
Conditions
- Cardiff Half Marathon
- 76/100
- Mizuno Swansea Half Marathon
- 77/100 Favoured
Entry fee (GBP)
- Mizuno Swansea Half Marathon
- Unavailable
Lowest modelled true cost (GBP)
- Mizuno Swansea Half Marathon
- Unavailable
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 | Cardiff Half Marathon | Mizuno Swansea Half Marathon |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2026-10-04 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2027-03-21 (legacy event-level date). |
| Location | Cardiff, Wales | Swansea, Wales |
| Actual distance | 21.1 km | 21.1 km |
| raceindex.org mapped route held | Not held | Held |
| raceindex.org elevation profile held | Not held | Held |
| Course type | Road | Loop |
| Surface | Road | Unavailable |
| Laps | 1 | Unavailable |
| Elevation character | Flat | Pancake Flat |
| Terrain | Road | Road |
| Scenery | City, Parkland, Waterfront, Riverside, Lakeside, Historic, Coastal | Coastal, City, Waterfront, Historic |
| Atmosphere | Big City, Community, Charity | Scenic Tour, Community |
| Technicality | Non Technical | Non Technical |
| Total ascent | 61 m | 44 m |
| Climbing density | Unavailable | 2.1 m/km |
| Total descent | 57 m | 44 m |
| Net elevation | 4 m | -0 m |
| Max absolute grade | Unavailable | 5.6% |
| Flat grade share | Unavailable | 96.0% |
| GAP factor | Unavailable | 0.1% |
| Cutoff | 4:30:00 | 4:00:00 |
| Field cap | 27,500 | Unavailable |
| Entry model | Ballot | Open |
| Entry fee | £58 | Unavailable |
| Lowest modelled true cost | £188 | Unavailable |
| Cost model origin | National Average | Unavailable |
| Measured course | Unavailable | Yes |
Schedule
- Cardiff Half Marathon
Exact race date not confirmed. Event weekend starts 2026-10-04 (legacy event-level date).
- Mizuno Swansea Half Marathon
Exact race date not confirmed. Event weekend starts 2027-03-21 (legacy event-level date).
Location
- Cardiff Half Marathon
- Cardiff, Wales
- Mizuno Swansea Half Marathon
- Swansea, Wales
Actual distance
- Cardiff Half Marathon
- 21.1 km
- Mizuno Swansea Half Marathon
- 21.1 km
raceindex.org mapped route held
- Cardiff Half Marathon
- Not held
- Mizuno Swansea Half Marathon
- Held
raceindex.org elevation profile held
- Cardiff Half Marathon
- Not held
- Mizuno Swansea Half Marathon
- Held
Course type
- Cardiff Half Marathon
- Road
- Mizuno Swansea Half Marathon
- Loop
Surface
- Cardiff Half Marathon
- Road
- Mizuno Swansea Half Marathon
- Unavailable
Laps
- Cardiff Half Marathon
- 1
- Mizuno Swansea Half Marathon
- Unavailable
Elevation character
- Cardiff Half Marathon
- Flat
- Mizuno Swansea Half Marathon
- Pancake Flat
Terrain
- Cardiff Half Marathon
- Road
- Mizuno Swansea Half Marathon
- Road
Scenery
- Cardiff Half Marathon
- City, Parkland, Waterfront, Riverside, Lakeside, Historic, Coastal
- Mizuno Swansea Half Marathon
- Coastal, City, Waterfront, Historic
Atmosphere
- Cardiff Half Marathon
- Big City, Community, Charity
- Mizuno Swansea Half Marathon
- Scenic Tour, Community
Technicality
- Cardiff Half Marathon
- Non Technical
- Mizuno Swansea Half Marathon
- Non Technical
Total ascent
- Cardiff Half Marathon
- 61 m
- Mizuno Swansea Half Marathon
- 44 m
Climbing density
- Cardiff Half Marathon
- Unavailable
- Mizuno Swansea Half Marathon
- 2.1 m/km
Total descent
- Cardiff Half Marathon
- 57 m
- Mizuno Swansea Half Marathon
- 44 m
Net elevation
- Cardiff Half Marathon
- 4 m
- Mizuno Swansea Half Marathon
- -0 m
Max absolute grade
- Cardiff Half Marathon
- Unavailable
- Mizuno Swansea Half Marathon
- 5.6%
Flat grade share
- Cardiff Half Marathon
- Unavailable
- Mizuno Swansea Half Marathon
- 96.0%
GAP factor
- Cardiff Half Marathon
- Unavailable
- Mizuno Swansea Half Marathon
- 0.1%
Cutoff
- Cardiff Half Marathon
- 4:30:00
- Mizuno Swansea Half Marathon
- 4:00:00
Field cap
- Cardiff Half Marathon
- 27,500
- Mizuno Swansea Half Marathon
- Unavailable
Entry model
- Cardiff Half Marathon
- Ballot
- Mizuno Swansea Half Marathon
- Open
Entry fee
- Cardiff Half Marathon
- £58
- Mizuno Swansea Half Marathon
- Unavailable
Lowest modelled true cost
- Cardiff Half Marathon
- £188
- Mizuno Swansea Half Marathon
- Unavailable
Cost model origin
- Cardiff Half Marathon
- National Average
- Mizuno Swansea Half Marathon
- Unavailable
Measured course
- Cardiff Half Marathon
- Unavailable
- Mizuno Swansea Half Marathon
- Yes
Facts are shown only when they exist in the sourced race record; Not held means no sourced value is held for that race.