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BOSTON MARATHON 2025

Simon Chandler

Bib: 29274•M

MA

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Division (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
30:09
Rank: #24850
Start → 5K
30:09 | 9:42/mi
10K· 6.21 mi
59:49
Rank: #24526 (+324)
5K → 10K
29:40 | 9:33/mi
15K· 9.32 mi
1:28:07
Rank: #23910 (+616)
10K → 15K
28:18 | 9:07/mi
20K· 12.43 mi
1:56:19
Rank: #23311 (+599)
15K → 20K
28:12 | 9:05/mi
Half· 13.11 mi
2:02:21
Rank: #23226 (+85)
20K → Half
6:02 | 8:51/mi
25K· 15.53 mi
2:23:49
Rank: #22638 (+588)
Half → 25K
21:28 | 8:51/mi
30K· 18.64 mi
2:51:27
Rank: #21738 (+900)
25K → 30K
27:38 | 8:54/mi
20M
3:03:43
Rank: #21392 (+346)
30K → 20M
12:16 | 9:02/mi
21M
3:12:49
Rank: #21027 (+365)
20M → 21M
9:06 | 9:06/mi
35K· 21.75 mi
3:19:19
Rank: #20880 (+147)
21M → 35K
6:30 | 8:41/mi
23M
3:30:40
Rank: #20638 (+242)
35K → 23M
11:21 | 9:04/mi
24M
3:40:04
Rank: #20591 (+47)
23M → 24M
9:24 | 9:24/mi
40K· 24.85 mi
3:48:11
Rank: #20535 (+56)
24M → 40K
8:07 | 9:30/mi
25.2M
3:51:35
Rank: #20494 (+41)
40K → 25.2M
3:24 | 9:52/mi
Finish· 26.22 mi
3:59:40
Rank: #20295 (+199)
25.2M → Finish
8:05 | 7:56/mi

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time2:02:21
Pace9:20 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:57:19
Pace8:57 /mi
📊Negative Split: 4.1% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:52:4730:099:4230:09
9:42
-
10K
6.21 mi12:22:2759:499:3829:40
9:33
-0:09
15K
9.32 mi12:50:451:28:079:2728:18
9:07
-0:26
20K
12.43 mi13:18:571:56:199:2228:12
9:05
-0:02
Half
13.11 mi13:24:592:02:219:206:02
8:51
-0:14
25K
15.53 mi13:46:272:23:499:1521:28
8:51
0:00
30K
18.64 mi14:14:052:51:279:1227:38
8:54
+0:03
20M
20.00 mi14:26:213:03:439:1112:16
9:02
+0:08
21M
21.00 mi14:35:273:12:499:119:06
9:06
+0:04
35K
21.75 mi14:41:573:19:199:106:30
8:41
-0:25
23M
23.00 mi14:53:183:30:409:1011:21
9:04
+0:23
24M
24.00 mi15:02:423:40:049:109:24
9:24
+0:20
40K
24.85 mi15:10:493:48:119:118:07
9:30
+0:06
25.2M
25.20 mi15:14:133:51:359:113:24
9:52
+0:22
Finish
26.22 mi15:22:183:59:409:098:05
7:56
-1:56

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

7:56 /mi

Average Pace

9:09 /mi

Slowest Pace

9:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

42:05

18% of race

Time at Steady Pace

1:56:51

49% of race

Time at Slower Pace

1:20:44

34% of race

Average Pace: 9:08 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:52:4730:099:4230:09
9:42
#24850
10K
6.21 mi12:22:2759:499:3829:40
9:33
#24526
15K
9.32 mi12:50:451:28:079:2728:18
9:07
#23910
20K
12.43 mi13:18:571:56:199:2228:12
9:05
#23311
Half
13.11 mi13:24:592:02:219:206:02
8:51
#23226
25K
15.53 mi13:46:272:23:499:1521:28
8:51
#22638
30K
18.64 mi14:14:052:51:279:1227:38
8:54
#21738
20M
20.00 mi14:26:213:03:439:1112:16
9:02
#21392
21M
21.00 mi14:35:273:12:499:119:06
9:06
#21027
35K
21.75 mi14:41:573:19:199:106:30
8:41
#20880
23M
23.00 mi14:53:183:30:409:1011:21
9:04
#20638
24M
24.00 mi15:02:423:40:049:109:24
9:24
#20591
40K
24.85 mi15:10:493:48:119:118:07
9:30
#20535
25.2M
25.20 mi15:14:133:51:359:113:24
9:52
#20494
Finish
26.22 mi15:22:183:59:409:098:05
7:56
#20295
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi24850146531465322481(Top 79%)13596(Top 84%)13596(Top 241%)
10K6.21 mi3.10 mi24526+32414497+15614497+15624230(Top 85%)14342(Top 89%)14342(Top 254%)
15K9.32 mi3.11 mi23910+61614222+27514222+27522481(Top 79%)13596(Top 84%)13596(Top 241%)
20K12.43 mi3.11 mi23311+59913958+26413958+26421339(Top 75%)13057(Top 81%)13057(Top 231%)
Half13.11 mi0.68 mi23226+8513917+4113917+4121085(Top 74%)12935(Top 80%)12935(Top 229%)
25K15.53 mi2.42 mi22638+58813631+28613631+28619212(Top 68%)12072(Top 75%)12072(Top 214%)
30K18.64 mi3.11 mi21738+90013201+43013201+43017117(Top 60%)10988(Top 68%)10988(Top 195%)
20M20.00 mi1.36 mi21392+34613010+19113010+19116932(Top 60%)10797(Top 67%)10797(Top 191%)
21M21.00 mi1.00 mi21027+36512836+17412836+17414100(Top 50%)9389(Top 58%)9389(Top 166%)
35K21.75 mi0.75 mi20880+14712752+8412752+8416611(Top 58%)10459(Top 65%)10459(Top 185%)
23M23.00 mi1.25 mi20638+24212620+13212620+13216627(Top 59%)10351(Top 64%)10351(Top 183%)
24M24.00 mi1.00 mi20591+4712578+4212578+4219223(Top 68%)11516(Top 72%)11516(Top 204%)
40K24.85 mi0.85 mi20535+5612541+3712541+3718681(Top 66%)11166(Top 69%)11166(Top 198%)
25.2M25.20 mi0.35 mi20494+4112515+2612515+2616375(Top 58%)10085(Top 63%)10085(Top 179%)
Finish26.22 mi1.02 mi20295+19912405+11012405+11012424(Top 44%)8257(Top 51%)8257(Top 146%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 79%
×21stories
+97ft-345ft

Overall

22481

Males

13596

M18-39

13596

5K→10K

3.1 - 6.2 mi

Top 85%
×5stories
+79ft-138ft

Overall

24230

Males

14342

M18-39

14342

10K→15K

6.2 - 9.3 mi

Top 79%
×3stories
+67ft-78ft

Overall

22481

Males

13596

M18-39

13596

15K→20K

9.3 - 12.4 mi

Top 75%
×5stories
+106ft-86ft

Overall

21339

Males

13057

M18-39

13057

20K→Half

12.4 - 13.1 mi

Top 74%
×2stories
+19ft-37ft

Overall

21085

Males

12935

M18-39

12935

Half→25K

13.1 - 15.5 mi

Top 68%
×4stories
+66ft-88ft

Overall

19212

Males

12072

M18-39

12072

25K→30K

15.5 - 18.6 mi

Top 60%
×9stories
+181ft-148ft

Overall

17117

Males

10988

M18-39

10988

30K→20M

18.6 - 20.0 mi

Top 60%
×5stories
+64ft-50ft

Overall

16932

Males

10797

M18-39

10797

20M→21M

20.0 - 21.0 mi

Top 50%
×8stories
+106ft-24ft

Overall

14100

Males

9389

M18-39

9389

21M→35K

21.0 - 21.8 mi

Top 58%
×7stories
+17ft-86ft

Overall

16611

Males

10459

M18-39

10459

35K→23M

21.8 - 23.0 mi

Top 59%
×5stories
+23ft-63ft

Overall

16627

Males

10351

M18-39

10351

23M→24M

23.0 - 24.0 mi

Top 68%
×6stories
+12ft-82ft

Overall

19223

Males

11516

M18-39

11516

24M→40K

24.0 - 24.9 mi

Top 66%
×1story
+6ft-20ft

Overall

18681

Males

11166

M18-39

11166

40K→25.2M

24.9 - 25.2 mi

Top 58%
×1story
+13ft-16ft

Overall

16375

Males

10085

M18-39

10085

25.2M→Finish

25.2 - 26.2 mi

Top 44%
×2stories
+22ft-21ft

Overall

12424

Males

8257

M18-39

8257

Passing Analysis

Category:
Athletes Passed
4739
Passed By
184
Net Change
+4555
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#24850
5K → 10K40480+324#24850#24526
10K → 15K6215+616#24526#23910
15K → 20K6034+599#23910#23311
20K → Half894+85#23311#23226
Half → 25K5891+588#23226#22638
25K → 30K9022+900#22638#21738
30K → 20M3471+346#21738#21392
20M → 21M3650+365#21392#21027
21M → 35K1514+147#21027#20880
35K → 23M2486+242#20880#20638
23M → 24M8437+47#20638#20591
24M → 40K8731+56#20591#20535
40K → 25.2M509+41#20535#20494
25.2M → Finish1990+199#20494#20295
TOTALS4739184+4555
📊

Passing Visuals

Category:
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🔥Passing Intensity

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing