Free tool
Compare marathons
Side-by-side comparison of elevation, PB potential, beginner friendliness, terrain, weather, and entry details. Pick two races and see how they stack up.
Race A
vs
Race B
Race A
Boston Marathon
Best for
World Major bucket-list
Race B
TCS London Marathon
Best for
Strong PB attemptsNewer marathonersWorld Major bucket-list
Race A
Boston Marathon
Boston, USA
Race B
TCS London Marathon
London, United Kingdom
Date
Expected April 2027
Expected April 2027
Month
Apr
Apr
Location
🇺🇸 Boston, USA
🇬🇧 London, United Kingdom
Terrain
Road
Road
Elevation gain
247 m
▲
84 m
PB potential
▲
Beginner friendly
▲
World Major
✓ Yes
✓ Yes
Entry type
Qualifier
Lottery
Entry status
Check official site
Check official site
Season
Spring · Americas
Spring · Europe
Race-day temp.
8–16°C
9–15°C
Conditions
Variable — can be ideal or brutal
Cool and overcast, occasional light rain
Humidity
50–70%
60–70%
Wind
Variable 10–25 km/h
10–20 km/h SW
Qualifies for
—
—
Want to know how these scores are calculated? See methodology →