Enter your goal time. Get hill-adjusted, km-by-km splits built from actual course data — including the Charlton descent, the Tower Bridge crossing, and the final charge down The Mall.
London's net elevation change is about 35 metres over 42.2 km — barely a blip on the course map. The race is run on smooth city roads, the crowd support is among the best in the world, and the late-April weather typically cooperates. On paper, conditions for a fast time.
What the summary numbers hide is the Charlton descent. Between kilometers 5 and 7, the course drops 44 metres off the Blackheath plateau — one of the steepest sustained descents of any World Major. Runners who don't account for it hammer the downhills, fry their quads, and spend the last 10 km paying the tab. The rest of the course — the Embankment, Westminster Bridge, the push to The Mall — all feel much harder when your legs are already spent from running km 5 like it's the finish line.
This calculator helps you solve that problem by giving you an exact, step-by-step plan built on research, experience, and data. Enter your goal time, set your uphill sensitivity, and get a target pace for every segment from Blackheath to The Mall that closes exactly to your goal time — accounting for every metre of elevation change on the course.
Enter your goal time and effort level. Your personalized splits appear instantly.
Results appear below. No email required.
| Segment | Elev | Effort | vs Goal Pace | Target Pace (min/km) |
Pace Bank | Elapsed |
|---|
Elevation data from TCS London Marathon official course profile. Uphill penalty applied above +0.4% grade; downhill benefit applied below −0.75% grade. Math closes exactly to goal time.
What the elevation profile doesn't fully capture — where the early descent traps runners, how the Canary Wharf loop drains energy at the worst time, and what it actually feels like to run down The Mall toward the finish.
The race starts on the Blackheath plateau, about 40 metres above the Thames. The opening 3 km are relatively gentle — a gradual rise of roughly 8 metres as the course loops through the start area, settles into order, and rolls through Woolwich Arsenal. You're still on high ground. The crowd is thick, the energy is electric, and every instinct says go.
Kilometers 5 through 7 plunge 44 metres off the plateau — one of the most significant sustained drops in World Marathon Major racing. The Charlton roads are fast, the legs feel good, and the downhill makes every pace feel easy. This is where thousands of London runners wreck their race before they've even crossed the Cutty Sark near km 10.
After the descent levels through Rotherhithe and Bermondsey, the course steadies into a mild rolling stretch heading toward the river. Around km 14 comes the Tower Bridge approach — a gentle 3-metre net rise as the course climbs slightly to cross the bridge. This is one of the great moments in marathon running: 40,000 runners and the biggest crowd concentration of the race, all converging on one of the most photographed bridges in the world. Take in the moment. Don't sprint across it.
After Tower Bridge, the course crosses to the north bank and heads east into Canary Wharf — London's modern financial district, a canyon of glass towers that creates its own atmosphere. Kilometers 16 through 18 are slightly downhill and fast. The half-marathon mark falls around km 21 in the Poplar area, and this is where London gets psychologically tricky.
Around km 21 at Poplar, the course climbs about 5 metres — modest, but it comes at the half. The crowd thins here compared to Tower Bridge. Runners who have been running on crowd energy since Blackheath suddenly feel the absence of it in the Isle of Dogs loop, which turns south and back through less-spectated streets. Kilometers 22 through 24 are net downhill but feel flat. Near km 25, the course drops about 4 metres as it turns back west toward the City.
The good news: by km 26, the hardest climbing on the course is behind you. What's ahead is flatter, more crowded, and lined with the famous London landmarks that pull runners to the finish. But you only get to use that energy if you haven't spent it in the Isle of Dogs.
Entering the City of London around km 27, the course regains some life. The Square Mile on a Sunday is quiet — office workers gone, streets lined with spectators who came specifically to watch — and the architecture shifts from glass towers to Georgian stone. The next few kilometers are mildly uphill (only a metre or two of net climb per km), mild enough to feel flat but present enough to slow tired legs.
Around km 31 is the stretch to watch: a 4-metre net rise along the approach to Victoria Embankment. The Embankment itself runs alongside the Thames with Parliament and the London Eye visible ahead, and the crowd lines both sides in deep pockets. It should be one of the best stretches of the race. But at km 31 of a marathon, even the best scenery can't hide heavy legs — and the climb here hits differently than it did at the start.
Near km 32, the course drops about 4 metres over Blackfriars Bridge — a brief welcome downhill. A couple of kilometers later, it climbs about 4 metres across Westminster Bridge, with Parliament and Big Ben directly overhead. The views are extraordinary. At km 34, you can also afford to start believing you're going to finish. A few kilometers of recovery and about 8 km of landmarks still to go.
The final section begins near Parliament Square and turns into Birdcage Walk, skirting the southern edge of St James's Park. Around km 37 the course rises about 3 metres — a small but genuine climb this late that asks something of already-taxed legs. Then near km 39 comes the biggest single-kilometer drop in the final quarter of the race: about 7 metres down Constitution Hill, with Buckingham Palace appearing directly ahead.
Kilometer 40 is flat. The Mall stretches ahead — the royal ceremonial route that has been the London Marathon finish since 1981. Plane trees line both sides. The crowd is packed 10 deep. The finish gantry is visible in the distance. If there was ever a moment to find whatever is left in the tank, this is it.
London's finish is unique among the World Majors — not because of an iconic building you run toward, but because of the setting itself. The Mall is one of the most formally beautiful streets in Europe, and running it with 40,000 other finishers is an experience that doesn't translate easily to any other race. Whatever your time, the final kilometer of London is worth every step that came before it.
Late April in London is mild but unpredictable — conditions that typically favor fast running when they cooperate, and test mental strength when they don't.
| Year | Start Temp | Humidity | Wind | Conditions |
|---|---|---|---|---|
| 2024 | 61°F | 63% | 12 mph W | Warm Sunny, warmer than typical |
| 2023 | 52°F | 71% | 8 mph SW | Good Overcast, cool, light cloud |
| 2022 | 54°F | 68% | 10 mph W | Good Partly cloudy, mild breeze |
| 2019 | 63°F | 57% | 13 mph NW | Warm Sunny and windy, warm |
| 2018 | 74°F | 46% | 9 mph SE | Hot Hottest London Marathon on record |
London's weather in late April ranges from near-ideal cool and overcast to genuinely warm. The 2018 edition was run in near-record heat (74°F at start), causing widespread slowdowns and medical interventions across the field. In typical years, cool temperatures and cloud cover keep conditions manageable. Runners targeting PRs should monitor the forecast in the week before race day — London's weather varies enough that a good year and a bad year can differ by 30 minutes for many runners.
The short answer: yes, on the right day — one of the fastest conditions in the World Majors.
The TCS London Marathon doesn't use Boston qualifying standards as an entry mechanism — the primary entry route is the public ballot. But it's one of the fastest marathon courses in the world for PRs. The net elevation of −35 metres, predominantly smooth urban roads, and the energy of 40,000 runners across 42.2 km create conditions where average runners consistently run their best times.
The structural caveat is the weather. London's late-April conditions vary significantly year to year. In 2023 and 2022, cool overcast days helped many runners to PRs. In 2024, warmer temperatures pushed times up across the field. In 2018, a heat wave made PRs nearly impossible for most runners. If you're targeting a personal best at London, the forecast in race week matters as much as your training.
The course itself suits most runners well. The net downhill means you're working slightly less than on a flat course across 42.2 km. The Charlton descent is fast enough to build a small pace bank if run conservatively. The Embankment and Mall sections in the second half are energized by massive crowds that carry tired runners through the closing 7 km. Elite runners have set multiple world records here, and for good reason.
Many London Marathon runners also target their Boston qualifying time during the race, even though London itself requires ballot entry. These are the official BAA standards for Boston 2026. To secure an entry, aim to beat your standard by at least 5 minutes — the cutoff typically falls several minutes under the stated standard due to field oversubscription.
| Age Group | Men | Women | Non-binary |
|---|---|---|---|
| 18–34 | 3:00:00 | 3:30:00 | 3:30:00 |
| 35–39 | 3:05:00 | 3:35:00 | 3:35:00 |
| 40–44 | 3:10:00 | 3:40:00 | 3:40:00 |
| 45–49 | 3:20:00 | 3:50:00 | 3:50:00 |
| 50–54 | 3:25:00 | 3:55:00 | 3:55:00 |
| 55–59 | 3:35:00 | 4:05:00 | 4:05:00 |
| 60–64 | 3:50:00 | 4:20:00 | 4:20:00 |
| 65–69 | 4:05:00 | 4:35:00 | 4:35:00 |
| 70–74 | 4:20:00 | 4:50:00 | 4:50:00 |
| 75–79 | 4:35:00 | 5:05:00 | 5:05:00 |
| 80+ | 4:50:00 | 5:20:00 | 5:20:00 |
The calculator's “Ideal” pacing strategy builds in a conservative buffer through the Charlton descent (km 5–7), steady effort through Canary Wharf, and a controlled push on the Embankment. This approach is specifically designed to leave enough in reserve for the final 6 km — the section where most London PRs are either secured or lost.
Everything you need to know before race weekend — from the ballot entry process to race-morning transport to what finishing on The Mall actually looks like.
Friday and Saturday (expo days): The race expo and packet pickup are held at ExCeL London in the Royal Docks — a large convention center on the Docklands Light Railway. Expect large crowds Saturday afternoon. Collect your bib and timing chip at the expo; race number envelopes are not mailed.
Sunday (race day): The marathon starts in waves from approximately 9:00am to 10:00am. Elite men and elite women run in separate starts earlier. Corrals close 15 minutes before your wave time — arrive at Blackheath well before that.
The start line is on Blackheath, near Greenwich in southeast London. There is no parking within any reasonable distance on race day — the area is closed and traffic is redirected. Travel by train or DLR: National Rail to Blackheath or Maze Hill stations (frequent service from London Bridge and Charing Cross), or DLR to Greenwich and walk up to the Heath.
Trains from central London start running early on race morning. Southbound services from London Bridge toward Blackheath are packed by 7:30am. The race organizers publish specific train times each year — check them the week before and stick to them.
The London Marathon places water and sports drink (Lucozade Sport, the official race partner) stations roughly every 1.6 km from about km 5 onward. Gel stations provide energy gels at specific points — the official race website publishes the positions and product types each year. Confirm brands before race day and test in training.
Medical support is extensive. London has one of the most comprehensive race-day medical operations of any major marathon, with medics on bikes, vehicles, and stationed throughout the course. St John Ambulance staffs most aid stations.
The finish line is on The Mall, the broad ceremonial boulevard running between Trafalgar Square and Buckingham Palace. Finisher medals, mylar blankets, water, and food are distributed in the area around St James's Park. The finisher area is large but can be congested — have a specific meeting point pre-arranged with any friends or family.
Bag drop is available near the start. Bags are transported to the finish by race logistics and distributed near the finisher area on The Mall. Retrieval can take time — plan 20–30 minutes after finishing before you have your bag.
London has hotels throughout the city, but race weekend books out 12–18 months in advance. The most practical areas are near London Bridge (quick National Rail access to Blackheath), Waterloo (short walk to Victoria for train access), or Greenwich itself for maximum start-line convenience.
The finish on The Mall means central London hotels near Westminster and St James's put you close to the finish with easy post-race access. The city's size means almost any central location is workable — the challenge is booking early enough to get a reasonable rate.
The main entry route is the public ballot, which opens in spring and closes quickly. Results are announced in October for the following April's race. The ballot is free to enter; successful applicants are notified by email and must pay their entry fee within a set window.
Alternative entry routes include charity places (fundraising minimum of £2,000–£4,000 depending on the charity), Good for Age qualification (requires a recent marathon time within a standard for your age and gender), and Championship entry for affiliated club runners with a verified fast time.
Not by marathon standards, but it isn't flat either. The net elevation change is −35 metres — a gentle overall descent from Blackheath to The Mall. The main elevation feature is the Charlton descent between km 5 and 7, where the course drops about 44 metres off the Blackheath plateau. That section is fast and energizing but punishing to quads if you run it too hard. The rest of the course is rolling with modest ups and downs, including a couple of bridge crossings (Tower Bridge, Blackfriars, Westminster) that add a metre or two of climb at inopportune moments in the second half.
Most runners would say kilometers 31–34 — the Embankment and Westminster Bridge section — but the damage usually starts much earlier, between km 5 and 7. The Charlton descent tempts runners to bank time early. Those who do arrive at the Embankment with wrecked quads and a negative pace bank, which makes the relatively modest climbs around km 31–34 feel genuinely brutal. The physically hardest section is km 5–7. The section where that damage gets collected is km 31–35.
Yes, on the right day. The net downhill course, smooth roads, massive crowd support, and typically cool late-April conditions make London one of the better World Majors for PR attempts. The main variable is the weather — 2018 was run in extreme heat and most runners were significantly slower than their fitness indicated. In favorable years (cool and overcast), London produces a high proportion of PRs and qualifiers across all age groups. The calculator's pacing strategy is specifically calibrated to help you run the Charlton descent conservatively, execute a strong Embankment section, and finish with a kick down The Mall.
The calculator uses net elevation data for each segment of the official London Marathon course and applies a research-backed penalty for uphill grades and a benefit for downhill grades. The math closes exactly to your goal time — meaning if you run every segment at the target pace shown, you'll finish in your goal time. What the calculator can't account for is weather, race-day congestion in the opening kilometers (London's mass start creates pacing challenges for the first few km), crowd effects, and how your legs respond to the Charlton descent specifically. Use the splits as your target range, not as a rigid prescription, and adjust based on how you feel at Tower Bridge (around km 14) and again at the halfway mark near Poplar (around km 21).
