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BOSTON MARATHON 2025

Cheng-Lin Chen

Bib: 21456•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F45-49)
#0 / 1813
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
9:15/mi
28:43
↑ 97↓ 3451.5%
10K· 6.21 mi
9:09/mi
57:09
↑ 79↓ 1380.4%
15K· 9.32 mi
10:04/mi
1:28:27
↑ 67↓ 78
20K· 12.43 mi
9:55/mi
1:59:16
↑ 106↓ 860.1%
Half· 13.11 mi
10:51/mi
2:06:40
↑ 19↓ 370.5%
25K· 15.53 mi
10:34/mi
2:32:18
↑ 66↓ 880.2%
30K· 18.64 mi
11:25/mi
3:07:47
↑ 181↓ 1480.2%
20M
10:39/mi
3:22:15
↑ 64↓ 500.2%
21M
12:16/mi
3:34:31
↑ 106↓ 241.6%
35K· 21.75 mi
11:30/mi
3:43:07
↑ 17↓ 861.7%
23M
10:38/mi
3:56:26
↑ 23↓ 630.6%
24M
10:28/mi
4:06:54
↓ 821.3%
40K· 24.85 mi
10:34/mi
4:15:56
↓ 200.3%
25.2M
12:19/mi
4:20:11
↑ 13↓ 160.2%
Finish· 26.22 mi
11:01/mi
4:31:25
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:06:40
Pace9:40 /mi
2nd Half
Distance13.11 mi
Time2:24:45
Pace11:03 /mi
📊Positive Split: 14.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:25:2628:439:1528:43
9:15
-
10K
6.21 mi11:53:5257:099:1228:26
9:09
-0:06
15K
9.32 mi12:25:101:28:279:2931:18
10:04
+0:55
20K
12.43 mi12:55:591:59:169:3630:49
9:55
-0:09
Half
13.11 mi13:03:232:06:409:407:24
10:51
+0:56
25K
15.53 mi13:29:012:32:189:4825:38
10:34
-0:17
30K
18.64 mi14:04:303:07:4710:0435:29
11:25
+0:51
20M
20.00 mi14:18:583:22:1510:0714:28
10:39
-0:46
21M
21.00 mi14:31:143:34:3110:1312:16
12:16
+1:37
35K
21.75 mi14:39:503:43:0710:168:36
11:30
-0:46
23M
23.00 mi14:53:093:56:2610:1713:19
10:38
-0:52
24M
24.00 mi15:03:374:06:5410:1710:28
10:28
-0:10
40K
24.85 mi15:12:394:15:5610:189:02
10:34
+0:06
25.2M
25.20 mi15:16:544:20:1110:194:15
12:19
+1:45
Finish
26.22 mi15:28:084:31:2510:2211:14
11:01
-1:18

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

9:09 /mi

Average Pace

10:22 /mi

Slowest Pace

12:19 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:59:16

44% of race

Time at Steady Pace

1:31:33

34% of race

Time at Slower Pace

1:00:36

22% of race

Average Pace: 10:21 /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 mi11:25:2628:439:1528:43
9:15
#23380
10K
6.21 mi11:53:5257:099:1228:26
9:09
#23200
15K
9.32 mi12:25:101:28:279:2931:18
10:04
#24008
20K
12.43 mi12:55:591:59:169:3630:49
9:55
#24009
Half
13.11 mi13:03:232:06:409:407:24
10:51
#24196
25K
15.53 mi13:29:012:32:189:4825:38
10:34
#24257
30K
18.64 mi14:04:303:07:4710:0435:29
11:25
#24396
20M
20.00 mi14:18:583:22:1510:0714:28
10:39
#24287
21M
21.00 mi14:31:143:34:3110:1312:16
12:16
#24268
35K
21.75 mi14:39:503:43:0710:168:36
11:30
#24300
23M
23.00 mi14:53:093:56:2610:1713:19
10:38
#24199
24M
24.00 mi15:03:374:06:5410:1710:28
10:28
#24147
40K
24.85 mi15:12:394:15:5610:189:02
10:34
#24077
25.2M
25.20 mi15:16:544:20:1110:194:15
12:19
#24077
Finish
26.22 mi15:28:084:31:2510:2211:14
11:01
#24140
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi233809379937925151(Top 89%)10307(Top 84%)10307(Top 569%)
10K6.21 mi3.10 mi23200+1809258+1219258+12123015(Top 81%)9146(Top 75%)9146(Top 504%)
15K9.32 mi3.11 mi24008-8089680-4229680-42225151(Top 89%)10307(Top 84%)10307(Top 569%)
20K12.43 mi3.11 mi24009-19699-199699-1924070(Top 85%)9750(Top 80%)9750(Top 538%)
Half13.11 mi0.68 mi24196-1879808-1099808-10926324(Top 93%)11010(Top 90%)11010(Top 607%)
25K15.53 mi2.42 mi24257-619853-459853-4524507(Top 86%)10019(Top 82%)10019(Top 553%)
30K18.64 mi3.11 mi24396-1399946-939946-9324737(Top 87%)10257(Top 84%)10257(Top 566%)
20M20.00 mi1.36 mi24287+1099905+419905+4122831(Top 80%)9337(Top 76%)9337(Top 515%)
21M21.00 mi1.00 mi24268+199911-69911-624050(Top 85%)10062(Top 82%)10062(Top 555%)
35K21.75 mi0.75 mi24300-329941-309941-3025102(Top 88%)10636(Top 87%)10636(Top 587%)
23M23.00 mi1.25 mi24199+1019905+369905+3622378(Top 79%)9274(Top 76%)9274(Top 512%)
24M24.00 mi1.00 mi24147+529893+129893+1222741(Top 80%)9510(Top 78%)9510(Top 525%)
40K24.85 mi0.85 mi24077+709871+229871+2222117(Top 78%)9267(Top 76%)9267(Top 511%)
25.2M25.20 mi0.35 mi240779874-39874-323891(Top 84%)10116(Top 83%)10116(Top 558%)
Finish26.22 mi1.02 mi24140-639909-359909-3525420(Top 89%)10863(Top 89%)10863(Top 599%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 89%
×21story building
+97ft-345ft

Overall

25151

Females

10307

F45-49

10307

5K→10K

3.1 - 6.2 mi

Top 81%
×5story building
+79ft-138ft

Overall

23015

Females

9146

F45-49

9146

10K→15K

6.2 - 9.3 mi

Top 89%
×3story building
+67ft-78ft

Overall

25151

Females

10307

F45-49

10307

15K→20K

9.3 - 12.4 mi

Top 85%
×5story building
+106ft-86ft

Overall

24070

Females

9750

F45-49

9750

20K→Half

12.4 - 13.1 mi

Top 93%
×2story building
+19ft-37ft

Overall

26324

Females

11010

F45-49

11010

Half→25K

13.1 - 15.5 mi

Top 86%
×4story building
+66ft-88ft

Overall

24507

Females

10019

F45-49

10019

25K→30K

15.5 - 18.6 mi

Top 87%
×9story building
+181ft-148ft

Overall

24737

Females

10257

F45-49

10257

30K→20M

18.6 - 20.0 mi

Top 80%
×5story building
+64ft-50ft

Overall

22831

Females

9337

F45-49

9337

20M→21M

20.0 - 21.0 mi

Top 85%
×8story building
+106ft-24ft

Overall

24050

Females

10062

F45-49

10062

21M→35K

21.0 - 21.8 mi

Top 88%
×7story building
+17ft-86ft

Overall

25102

Females

10636

F45-49

10636

35K→23M

21.8 - 23.0 mi

Top 79%
×5story building
+23ft-63ft

Overall

22378

Females

9274

F45-49

9274

23M→24M

23.0 - 24.0 mi

Top 80%
×6story building
+12ft-82ft

Overall

22741

Females

9510

F45-49

9510

24M→40K

24.0 - 24.9 mi

Top 78%
×1story
+6ft-20ft

Overall

22117

Females

9267

F45-49

9267

40K→25.2M

24.9 - 25.2 mi

Top 84%
×1story
+13ft-16ft

Overall

23891

Females

10116

F45-49

10116

25.2M→Finish

25.2 - 26.2 mi

Top 89%
×2story building
+22ft-21ft

Overall

25420

Females

10863

F45-49

10863

Passing Analysis

Category:
Athletes Passed
1215
Passed By
1975
Net Change
-760
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23380
5K → 10K333153+180#23380#23200
10K → 15K31839-808#23200#24008
15K → 20K143144-1#24008#24009
20K → Half2189-187#24009#24196
Half → 25K94155-61#24196#24257
25K → 30K90229-139#24257#24396
30K → 20M12112+109#24396#24287
20M → 21M7253+19#24287#24268
21M → 35K2658-32#24268#24300
35K → 23M11615+101#24300#24199
23M → 24M6917+52#24199#24147
24M → 40K8414+70#24147#24077
40K → 25.2M18180#24077#24077
25.2M → Finish1679-63#24077#24140
TOTALS12151975-760
📊

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