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BOSTON MARATHON 2025

James Cai

Bib: 2657•M

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 6%
Gender (Male)
#0 / 16105
Top 10%
Division (M18-39)
#0 / 5642
Top 24%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
6:18/mi
19:33
↑ 97↓ 3451.5%
10K· 6.21 mi
6:14/mi
38:56
↑ 79↓ 1380.4%
15K· 9.32 mi
6:10/mi
58:05
↑ 67↓ 78
20K· 12.43 mi
6:16/mi
1:17:34
↑ 106↓ 860.1%
Half· 13.11 mi
6:09/mi
1:21:46
↑ 19↓ 370.5%
25K· 15.53 mi
6:17/mi
1:37:01
↑ 66↓ 880.2%
30K· 18.64 mi
6:24/mi
1:56:55
↑ 181↓ 1480.2%
20M
6:27/mi
2:05:41
↑ 64↓ 500.2%
21M
6:43/mi
2:12:24
↑ 106↓ 241.6%
35K· 21.75 mi
6:25/mi
2:17:12
↑ 17↓ 861.7%
23M
6:46/mi
2:25:40
↑ 23↓ 630.6%
24M
6:27/mi
2:32:07
↓ 821.3%
40K· 24.85 mi
6:35/mi
2:37:45
↓ 200.3%
25.2M
7:12/mi
2:40:14
↑ 13↓ 160.2%
Finish· 26.22 mi
6:24/mi
2:46:45
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:21:46
Pace6:14 /mi
2nd Half
Distance13.11 mi
Time1:24:59
Pace6:29 /mi
📊Positive Split: 3.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:1419:336:1819:33
6:18
-
10K
6.21 mi10:41:3738:566:1619:23
6:14
-0:04
15K
9.32 mi11:00:4658:056:1419:09
6:10
-0:04
20K
12.43 mi11:20:151:17:346:1419:29
6:16
+0:06
Half
13.11 mi11:24:271:21:466:144:12
6:09
-0:07
25K
15.53 mi11:39:421:37:016:1515:15
6:17
+0:08
30K
18.64 mi11:59:361:56:556:1619:54
6:24
+0:07
20M
20.00 mi12:08:222:05:416:178:46
6:27
+0:03
21M
21.00 mi12:15:052:12:246:186:43
6:43
+0:16
35K
21.75 mi12:19:532:17:126:194:48
6:25
-0:18
23M
23.00 mi12:28:212:25:406:208:28
6:46
+0:21
24M
24.00 mi12:34:482:32:076:206:27
6:27
-0:19
40K
24.85 mi12:40:262:37:456:215:38
6:35
+0:08
25.2M
25.20 mi12:42:552:40:146:222:29
7:12
+0:37
Finish
26.22 mi12:49:262:46:456:226:31
6:24
-0:48

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

6:09 /mi

Average Pace

6:22 /mi

Slowest Pace

7:12 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:35:48

93% of race

Time at Steady Pace

10:57

7% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:22 /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 mi10:22:1419:336:1819:33
6:18
#2405
10K
6.21 mi10:41:3738:566:1619:23
6:14
#2223
15K
9.32 mi11:00:4658:056:1419:09
6:10
#2008
20K
12.43 mi11:20:151:17:346:1419:29
6:16
#1958
Half
13.11 mi11:24:271:21:466:144:12
6:09
#1937
25K
15.53 mi11:39:421:37:016:1515:15
6:17
#1913
30K
18.64 mi11:59:361:56:556:1619:54
6:24
#1815
20M
20.00 mi12:08:222:05:416:178:46
6:27
#1760
21M
21.00 mi12:15:052:12:246:186:43
6:43
#1700
35K
21.75 mi12:19:532:17:126:194:48
6:25
#1689
23M
23.00 mi12:28:212:25:406:208:28
6:46
#1709
24M
24.00 mi12:34:482:32:076:206:27
6:27
#1687
40K
24.85 mi12:40:262:37:456:215:38
6:35
#1659
25.2M
25.20 mi12:42:552:40:146:222:29
7:12
#1661
Finish
26.22 mi12:49:262:46:456:226:31
6:24
#1673
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi2405229122911672(Top 6%)1588(Top 10%)1588(Top 28%)
10K6.21 mi3.10 mi2223+1822121+1702121+1702099(Top 7%)2002(Top 12%)2002(Top 35%)
15K9.32 mi3.11 mi2008+2151912+2091912+2091672(Top 6%)1588(Top 10%)1588(Top 28%)
20K12.43 mi3.11 mi1958+501868+441868+441899(Top 7%)1809(Top 11%)1809(Top 32%)
Half13.11 mi0.68 mi1937+211847+211847+211785(Top 6%)1701(Top 11%)1701(Top 30%)
25K15.53 mi2.42 mi1913+241823+241823+241813(Top 6%)1723(Top 11%)1723(Top 31%)
30K18.64 mi3.11 mi1815+981728+951728+951587(Top 6%)1504(Top 9%)1504(Top 27%)
20M20.00 mi1.36 mi1760+551672+561672+561450(Top 5%)1372(Top 9%)1372(Top 24%)
21M21.00 mi1.00 mi1700+601612+601612+601268(Top 4%)1198(Top 7%)1198(Top 21%)
35K21.75 mi0.75 mi1689+111601+111601+112102(Top 7%)1969(Top 12%)1969(Top 35%)
23M23.00 mi1.25 mi1709-201619-181619-182526(Top 9%)2337(Top 15%)2337(Top 41%)
24M24.00 mi1.00 mi1687+221597+221597+221869(Top 7%)1738(Top 11%)1738(Top 31%)
40K24.85 mi0.85 mi1659+281570+271570+271940(Top 7%)1790(Top 11%)1790(Top 32%)
25.2M25.20 mi0.35 mi1661-21573-31573-32164(Top 8%)1953(Top 12%)1953(Top 35%)
Finish26.22 mi1.02 mi1673-121583-101583-102301(Top 8%)2104(Top 13%)2104(Top 37%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 6%
×21story building
+97ft-345ft

Overall

1672

Males

1588

M18-39

1588

5K→10K

3.1 - 6.2 mi

Top 7%
×5story building
+79ft-138ft

Overall

2099

Males

2002

M18-39

2002

10K→15K

6.2 - 9.3 mi

Top 6%
×3story building
+67ft-78ft

Overall

1672

Males

1588

M18-39

1588

15K→20K

9.3 - 12.4 mi

Top 7%
×5story building
+106ft-86ft

Overall

1899

Males

1809

M18-39

1809

20K→Half

12.4 - 13.1 mi

Top 6%
×2story building
+19ft-37ft

Overall

1785

Males

1701

M18-39

1701

Half→25K

13.1 - 15.5 mi

Top 6%
×4story building
+66ft-88ft

Overall

1813

Males

1723

M18-39

1723

25K→30K

15.5 - 18.6 mi

Top 6%
×9story building
+181ft-148ft

Overall

1587

Males

1504

M18-39

1504

30K→20M

18.6 - 20.0 mi

Top 5%
×5story building
+64ft-50ft

Overall

1450

Males

1372

M18-39

1372

20M→21M

20.0 - 21.0 mi

Top 4%
×8story building
+106ft-24ft

Overall

1268

Males

1198

M18-39

1198

21M→35K

21.0 - 21.8 mi

Top 7%
×7story building
+17ft-86ft

Overall

2102

Males

1969

M18-39

1969

35K→23M

21.8 - 23.0 mi

Top 9%
×5story building
+23ft-63ft

Overall

2526

Males

2337

M18-39

2337

23M→24M

23.0 - 24.0 mi

Top 7%
×6story building
+12ft-82ft

Overall

1869

Males

1738

M18-39

1738

24M→40K

24.0 - 24.9 mi

Top 7%
×1story
+6ft-20ft

Overall

1940

Males

1790

M18-39

1790

40K→25.2M

24.9 - 25.2 mi

Top 8%
×1story
+13ft-16ft

Overall

2164

Males

1953

M18-39

1953

25.2M→Finish

25.2 - 26.2 mi

Top 8%
×2story building
+22ft-21ft

Overall

2301

Males

2104

M18-39

2104

Passing Analysis

Category:
Athletes Passed
1057
Passed By
325
Net Change
+732
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2405
5K → 10K22543+182#2405#2223
10K → 15K2238+215#2223#2008
15K → 20K8838+50#2008#1958
20K → Half232+21#1958#1937
Half → 25K5329+24#1937#1913
25K → 30K13133+98#1913#1815
30K → 20M6611+55#1815#1760
20M → 21M7111+60#1760#1700
21M → 35K2110+11#1700#1689
35K → 23M3555-20#1689#1709
23M → 24M4321+22#1709#1687
24M → 40K379+28#1687#1659
40K → 25.2M1416-2#1659#1661
25.2M → Finish2739-12#1661#1673
TOTALS1057325+732
📊

Passing Visuals

Category:
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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