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