London Marathon
London, United Kingdom · Monday 26 April 2027
The London Marathon is a major road race held annually in London, England, covering a distance of approximately 42.195 kilometers (26.219 miles) in a point-to-point format around the River Thames. The course is known for its largely flat profile, with a total elevation gain of about 122 meters (400 feet).
Difficulty Calculator
h
:m
:s
Adjusted Time
3:58:04
Time difference: -1.9 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain128m
Elevation High55m
Elevation Low2m
Weather Forecast
High20°C
Low9°C
Chance of Rain0%
How hard is London Marathon?
Moderateharder than 32% of marathons
Flattest / easiestHardest
On our difficulty model, London Marathon plays about 2 minutes slower than an average road marathon for a 3:30 runner. It ranks #777 hardest of 1150 marathons we analyse, and #44 of 57 in United Kingdom. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at London Marathon?
Estimated finish times on this course versus the same effort on an average road marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On London Marathon | Difference |
|---|---|---|
| 3:00:00 | 2:56:58 | −03:02 |
| 3:30:00 | 3:27:29 | −02:31 |
| 4:00:00 | 3:58:04 | −01:56 |
| 4:30:00 | 4:28:41 | −01:19 |
| 5:00:00 | 4:59:20 | −00:40 |
| 5:30:00 | 5:30:02 | +00:02 |
| 6:00:00 | 6:00:47 | +00:47 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
London Marathon 2027 Course Analysis
London Marathon is a full marathon held in London, United Kingdom. It is scheduled for Monday 26 April 2027. The course is run on road surface with 128m of total climbing, with its high point near 55m above sea level. For registration and full race details, visit the official London Marathon website.
Elevation Profile
With 128m of total climbing, this is a gently undulating course. The elevation changes are manageable for most runners and shouldn't greatly affect your pacing.
Expected Race Day Weather
Based on historical weather data for April, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 9°C to 20°C. This temperature range is widely considered optimal for marathon performance, allowing efficient heat dissipation without cold-related issues. There is a low chance of rain (0%), so dry conditions are likely.
Surface Type: Road
London Marathon is run on road surfaces, which provide the fastest and most predictable conditions for racing. Road courses allow for consistent pacing and are typically the best choice for a personal best.
Looking for an easier marathon or a tougher challenge? You can also compare London Marathon against other marathons to find the right race for your goals.
Marathons of similar difficulty
If London Marathon fits your goal, these courses play out about the same on our difficulty model.
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