Thames Path 100 Ultramarathon vs North Downs Way 100 Ultramarathon

Name: Thames Path 100 Ultramarathon vs North Downs Way 100 Ultramarathon comparison data
Creator: raceindex.org

Thames Path 100 Ultramarathon or North Downs Way 100 Ultramarathon — which comes out ahead?

North Downs Way 100 Ultramarathon has the stronger available profile on flat grade share, value score and scenery score.

Route comparison snapshot

Thames Path 100 Ultramarathon

Mapped route: Held
Elevation profile: Held
course flatness: 0.4% Favoured
flat grade share: 94.4%
lower ascent: 222 m
climbing density: 1.4 m/km
net elevation: 48 m
maximum grade: 11.9%

North Downs Way 100 Ultramarathon

Mapped route: Held
Elevation profile: Held
course flatness: 0.4%
flat grade share: 97.3% Favoured
lower ascent: 155 m
climbing density: 0.9 m/km
net elevation: 59 m
maximum grade: 20.8%

Head-to-head comparison
Metric	Thames Path 100 Ultramarathon	North Downs Way 100 Ultramarathon
Flat grade share	94.4%	97.3% ✓
GAP factor (% slower than flat)	0.4% ✓	0.4%
Uphill share	2.7%	1.0%
Steep-up share	0.1%	0.4%
Downhill share	2.9%	1.7%
Total ascent (m)	222 m	155 m
Climbing density (m/km)	1.4 m/km	0.9 m/km
Longest climb length (m)	44,380 m	39,450 m
Longest climb gain (m)	62 m	47 m
Longest climb average grade	0.1%	0.1%
Total descent (m)	174 m	95 m
Net elevation (m)	48 m	59 m
Max absolute grade	11.9%	20.8%
Start elevation (m)	10 m	73 m
Finish elevation (m)	58 m	133 m
Value	47/100	48/100 ✓
Scenic score	51/100	66/100 ✓
Conditions	63/100	64/100 ✓
Entry fee (GBP)	£225	£220 ✓
Lowest modelled true cost (GBP)	£355	£350 ✓

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

Race facts comparison
Fact	Thames Path 100 Ultramarathon	North Downs Way 100 Ultramarathon
Schedule	Exact race date not confirmed. Event weekend starts 2027-05-01 (legacy event-level date).	Exact race date not confirmed. Event weekend starts 2026-08-08 (legacy event-level date).
Location	Richmond to Oxford, South East	Farnham to Ashford, South East
Actual distance	160.9 km	167 km
raceindex.org mapped route held	Held	Held
raceindex.org elevation profile held	Held	Held
Course type	Point To Point	Point To Point
Surface	Mostly trail (about 75% trail, 25% paved)	Trail
Elevation character	Flat	Hilly
Terrain	Trail, Towpath	Trail, Mixed, Road
Scenery	Riverside, Countryside, City, Historic	Countryside, Forest, Riverside, Historic
Atmosphere	Scenic Tour, Destination	Scenic Tour, Nighttime, Competitive
Technicality	Non Technical	Moderate
Total ascent	222 m	155 m
Climbing density	1.4 m/km	0.9 m/km
Total descent	174 m	95 m
Net elevation	48 m	59 m
Max absolute grade	11.9%	20.8%
Flat grade share	94.4%	97.3%
GAP factor	0.4%	0.4%
Cutoff	30:00:00	30:00:00
Field cap	300	250
Entry model	Qualifier	Qualifier
Entry fee	£225	£220
Lowest modelled true cost	£355	£350
Cost model origin	National Average	National Average

Schedule

Thames Path 100 Ultramarathon: Exact race date not confirmed. Event weekend starts 2027-05-01 (legacy event-level date).
North Downs Way 100 Ultramarathon: Exact race date not confirmed. Event weekend starts 2026-08-08 (legacy event-level date).

Location

Thames Path 100 Ultramarathon: Richmond to Oxford, South East
North Downs Way 100 Ultramarathon: Farnham to Ashford, South East

Actual distance

Thames Path 100 Ultramarathon: 160.9 km
North Downs Way 100 Ultramarathon: 167 km

raceindex.org mapped route held

Thames Path 100 Ultramarathon: Held
North Downs Way 100 Ultramarathon: Held

raceindex.org elevation profile held

Thames Path 100 Ultramarathon: Held
North Downs Way 100 Ultramarathon: Held

Course type

Thames Path 100 Ultramarathon: Point To Point
North Downs Way 100 Ultramarathon: Point To Point

Surface

Thames Path 100 Ultramarathon: Mostly trail (about 75% trail, 25% paved)
North Downs Way 100 Ultramarathon: Trail

Elevation character

Thames Path 100 Ultramarathon: Flat
North Downs Way 100 Ultramarathon: Hilly

Terrain

Thames Path 100 Ultramarathon: Trail, Towpath
North Downs Way 100 Ultramarathon: Trail, Mixed, Road

Scenery

Thames Path 100 Ultramarathon: Riverside, Countryside, City, Historic
North Downs Way 100 Ultramarathon: Countryside, Forest, Riverside, Historic

Atmosphere

Thames Path 100 Ultramarathon: Scenic Tour, Destination
North Downs Way 100 Ultramarathon: Scenic Tour, Nighttime, Competitive

Technicality

Thames Path 100 Ultramarathon: Non Technical
North Downs Way 100 Ultramarathon: Moderate

Total ascent

Thames Path 100 Ultramarathon: 222 m
North Downs Way 100 Ultramarathon: 155 m

Climbing density

Thames Path 100 Ultramarathon: 1.4 m/km
North Downs Way 100 Ultramarathon: 0.9 m/km

Total descent

Thames Path 100 Ultramarathon: 174 m
North Downs Way 100 Ultramarathon: 95 m

Net elevation

Thames Path 100 Ultramarathon: 48 m
North Downs Way 100 Ultramarathon: 59 m

Max absolute grade

Thames Path 100 Ultramarathon: 11.9%
North Downs Way 100 Ultramarathon: 20.8%

Flat grade share

Thames Path 100 Ultramarathon: 94.4%
North Downs Way 100 Ultramarathon: 97.3%

GAP factor

Thames Path 100 Ultramarathon: 0.4%
North Downs Way 100 Ultramarathon: 0.4%

Cutoff

Thames Path 100 Ultramarathon: 30:00:00
North Downs Way 100 Ultramarathon: 30:00:00

Field cap

Thames Path 100 Ultramarathon: 300
North Downs Way 100 Ultramarathon: 250

Entry model

Thames Path 100 Ultramarathon: Qualifier
North Downs Way 100 Ultramarathon: Qualifier

Entry fee

Thames Path 100 Ultramarathon: £225
North Downs Way 100 Ultramarathon: £220

Lowest modelled true cost

Thames Path 100 Ultramarathon: £355
North Downs Way 100 Ultramarathon: £350

Cost model origin

Thames Path 100 Ultramarathon: National Average
North Downs Way 100 Ultramarathon: National Average

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 Path 100 Ultramarathon or North Downs Way 100 Ultramarathon?

Thames Path 100 Ultramarathon has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.

Read the full pages

How figures are calculated →

How we calculated this

Published facts and derived model outputs on this page are tied to stored sources or a published, version-locked methodology. We show the provenance so runners, coaches and organisers can check it. Data on this page is current as of 2026-07-25.

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (4)

Layer E archive-api.open-meteo.com
Layer B src_derived
Layer A centurionrunning.com · last check inconclusive on 2026-07-30
Layer A centurionrunning.com · source page changed since our last check on 2026-07-25

Read the full methodology →

Thames Path 100 Ultramarathon or North Downs Way 100 Ultramarathon — which comes out ahead?

Route comparison snapshot

Thames Path 100 Ultramarathon

North Downs Way 100 Ultramarathon

Flat grade share

GAP factor (% slower than flat)

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)

Value

Scenic score

Conditions

Entry fee (GBP)

Lowest modelled true cost (GBP)

Race facts that change the decision

Schedule

Location

Actual distance

raceindex.org mapped route held

raceindex.org elevation profile held

Course type

Surface

Elevation character

Terrain

Scenery

Atmosphere

Technicality

Total ascent

Climbing density

Total descent

Net elevation

Max absolute grade

Flat grade share

GAP factor

Cutoff

Field cap

Entry model

Entry fee

Lowest modelled true cost

Cost model origin

Common questions

Which is flatter, Thames Path 100 Ultramarathon or North Downs Way 100 Ultramarathon?

Read the full pages