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BOSTON MARATHON 2025

Kung-Chi Chang

Bib: 2917•M

MA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 9%
Gender (Male)
#0 / 16105
Top 15%
Masters (Masters Men)
#0 / 10463
Top 5%
Division (M40-44)
#0 / 2247
Top 14%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:00
Rank: #3376
Start → 5K
20:00 | 6:26/mi
10K· 6.21 mi
40:03
Rank: #3371 (+5)
5K → 10K
20:03 | 6:27/mi
15K· 9.32 mi
1:00:05
Rank: #3297 (+74)
10K → 15K
20:02 | 6:27/mi
20K· 12.43 mi
1:20:05
Rank: #3129 (+168)
15K → 20K
20:00 | 6:26/mi
Half· 13.11 mi
1:24:26
Rank: #3117 (+12)
20K → Half
4:21 | 6:23/mi
25K· 15.53 mi
1:40:05
Rank: #3009 (+108)
Half → 25K
15:39 | 6:27/mi
30K· 18.64 mi
2:00:38
Rank: #2858 (+151)
25K → 30K
20:33 | 6:37/mi
20M
2:09:44
Rank: #2793 (+65)
30K → 20M
9:06 | 6:42/mi
21M
2:16:44
Rank: #2730 (+63)
20M → 21M
7:00 | 7:00/mi
35K· 21.75 mi
2:21:38
Rank: #2714 (+16)
21M → 35K
4:54 | 6:33/mi
23M
2:30:02
Rank: #2649 (+65)
35K → 23M
8:24 | 6:43/mi
24M
2:36:40
Rank: #2611 (+38)
23M → 24M
6:38 | 6:38/mi
40K· 24.85 mi
2:42:37
Rank: #2618 (-7)
24M → 40K
5:57 | 6:58/mi
25.2M
2:45:11
Rank: #2619 (-1)
40K → 25.2M
2:34 | 7:27/mi
Finish· 26.22 mi
2:51:53
Rank: #2614 (+5)
25.2M → Finish
6:42 | 6:34/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:24:26
Pace6:26 /mi
2nd Half
Distance13.11 mi
Time1:27:27
Pace6:40 /mi
📊Positive Split: 3.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:1120:006:2620:00
6:26
-
10K
6.21 mi10:42:1440:036:2720:03
6:27
+0:01
15K
9.32 mi11:02:161:00:056:2720:02
6:27
0:00
20K
12.43 mi11:22:161:20:056:2720:00
6:26
-0:01
Half
13.11 mi11:26:371:24:266:264:21
6:23
-0:03
25K
15.53 mi11:42:161:40:056:2715:39
6:27
+0:04
30K
18.64 mi12:02:492:00:386:2820:33
6:37
+0:10
20M
20.00 mi12:11:552:09:446:299:06
6:42
+0:05
21M
21.00 mi12:18:552:16:446:317:00
7:00
+0:18
35K
21.75 mi12:23:492:21:386:314:54
6:33
-0:27
23M
23.00 mi12:32:132:30:026:318:24
6:43
+0:10
24M
24.00 mi12:38:512:36:406:326:38
6:38
-0:05
40K
24.85 mi12:44:482:42:376:335:57
6:58
+0:20
25.2M
25.20 mi12:47:222:45:116:332:34
7:27
+0:29
Finish
26.22 mi12:54:042:51:536:346:42
6:34
-0:53

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

6:23 /mi

Average Pace

6:34 /mi

Slowest Pace

7:27 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:49:19

99% of race

Time at Steady Pace

2:34

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:33 /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 mi10:22:1120:006:2620:00
6:26
#3376
10K
6.21 mi10:42:1440:036:2720:03
6:27
#3371
15K
9.32 mi11:02:161:00:056:2720:02
6:27
#3297
20K
12.43 mi11:22:161:20:056:2720:00
6:26
#3129
Half
13.11 mi11:26:371:24:266:264:21
6:23
#3117
25K
15.53 mi11:42:161:40:056:2715:39
6:27
#3009
30K
18.64 mi12:02:492:00:386:2820:33
6:37
#2858
20M
20.00 mi12:11:552:09:446:299:06
6:42
#2793
21M
21.00 mi12:18:552:16:446:317:00
7:00
#2730
35K
21.75 mi12:23:492:21:386:314:54
6:33
#2714
23M
23.00 mi12:32:132:30:026:318:24
6:43
#2649
24M
24.00 mi12:38:512:36:406:326:38
6:38
#2611
40K
24.85 mi12:44:482:42:376:335:57
6:58
#2618
25.2M
25.20 mi12:47:222:45:116:332:34
7:27
#2619
Finish
26.22 mi12:54:042:51:536:346:42
6:34
#2614
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi3376320732073242(Top 11%)3082(Top 19%)3082(Top 137%)
10K6.21 mi3.10 mi3371+53201+63201+63397(Top 12%)3226(Top 20%)3226(Top 144%)
15K9.32 mi3.11 mi3297+743133+683133+683242(Top 11%)3082(Top 19%)3082(Top 137%)
20K12.43 mi3.11 mi3129+1682981+1522981+1522748(Top 10%)2618(Top 16%)2618(Top 117%)
Half13.11 mi0.68 mi3117+122971+102971+102964(Top 10%)2831(Top 18%)2831(Top 126%)
25K15.53 mi2.42 mi3009+1082867+1042867+1042652(Top 9%)2525(Top 16%)2525(Top 112%)
30K18.64 mi3.11 mi2858+1512722+1452722+1452481(Top 9%)2349(Top 15%)2349(Top 105%)
20M20.00 mi1.36 mi2793+652660+622660+622462(Top 9%)2323(Top 14%)2323(Top 103%)
21M21.00 mi1.00 mi2730+632600+602600+602272(Top 8%)2123(Top 13%)2123(Top 94%)
35K21.75 mi0.75 mi2714+162582+182582+182742(Top 10%)2540(Top 16%)2540(Top 113%)
23M23.00 mi1.25 mi2649+652516+662516+662306(Top 8%)2149(Top 13%)2149(Top 96%)
24M24.00 mi1.00 mi2611+382478+382478+382655(Top 9%)2438(Top 15%)2438(Top 109%)
40K24.85 mi0.85 mi2618-72482-42482-43670(Top 13%)3240(Top 20%)3240(Top 144%)
25.2M25.20 mi0.35 mi2619-12480+22480+23180(Top 11%)2821(Top 18%)2821(Top 126%)
Finish26.22 mi1.02 mi2614+52474+62474+63210(Top 11%)2842(Top 18%)2842(Top 126%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 11%
×21stories
+97ft-345ft

Overall

3242

Males

3082

M40-44

3082

5K→10K

3.1 - 6.2 mi

Top 12%
×5stories
+79ft-138ft

Overall

3397

Males

3226

M40-44

3226

10K→15K

6.2 - 9.3 mi

Top 11%
×3stories
+67ft-78ft

Overall

3242

Males

3082

M40-44

3082

15K→20K

9.3 - 12.4 mi

Top 10%
×5stories
+106ft-86ft

Overall

2748

Males

2618

M40-44

2618

20K→Half

12.4 - 13.1 mi

Top 10%
×2stories
+19ft-37ft

Overall

2964

Males

2831

M40-44

2831

Half→25K

13.1 - 15.5 mi

Top 9%
×4stories
+66ft-88ft

Overall

2652

Males

2525

M40-44

2525

25K→30K

15.5 - 18.6 mi

Top 9%
×9stories
+181ft-148ft

Overall

2481

Males

2349

M40-44

2349

30K→20M

18.6 - 20.0 mi

Top 9%
×5stories
+64ft-50ft

Overall

2462

Males

2323

M40-44

2323

20M→21M

20.0 - 21.0 mi

Top 8%
×8stories
+106ft-24ft

Overall

2272

Males

2123

M40-44

2123

21M→35K

21.0 - 21.8 mi

Top 10%
×7stories
+17ft-86ft

Overall

2742

Males

2540

M40-44

2540

35K→23M

21.8 - 23.0 mi

Top 8%
×5stories
+23ft-63ft

Overall

2306

Males

2149

M40-44

2149

23M→24M

23.0 - 24.0 mi

Top 9%
×6stories
+12ft-82ft

Overall

2655

Males

2438

M40-44

2438

24M→40K

24.0 - 24.9 mi

Top 13%
×1story
+6ft-20ft

Overall

3670

Males

3240

M40-44

3240

40K→25.2M

24.9 - 25.2 mi

Top 11%
×1story
+13ft-16ft

Overall

3180

Males

2821

M40-44

2821

25.2M→Finish

25.2 - 26.2 mi

Top 11%
×2stories
+22ft-21ft

Overall

3210

Males

2842

M40-44

2842

Passing Analysis

Category:
Athletes Passed
1198
Passed By
436
Net Change
+762
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#3376
5K → 10K122117+5#3376#3371
10K → 15K13056+74#3371#3297
15K → 20K18315+168#3297#3129
20K → Half208+12#3129#3117
Half → 25K12214+108#3117#3009
25K → 30K19241+151#3009#2858
30K → 20M8722+65#2858#2793
20M → 21M7613+63#2793#2730
21M → 35K3216+16#2730#2714
35K → 23M9025+65#2714#2649
23M → 24M5719+38#2649#2611
24M → 40K3441-7#2611#2618
40K → 25.2M1617-1#2618#2619
25.2M → Finish3732+5#2619#2614
TOTALS1198436+762
📊

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