Boston Marathon logo
BOSTON MARATHON 2025

Kevin Chang

Bib: 4066•M

CA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 25%
Gender (Male)
#0 / 16105
Top 38%
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
20:38
Rank: #4945
Start → 5K
20:38 | 6:38/mi
10K· 6.21 mi
40:59
Rank: #4467 (+478)
5K → 10K
20:21 | 6:33/mi
15K· 9.32 mi
1:01:33
Rank: #4426 (+41)
10K → 15K
20:34 | 6:37/mi
20K· 12.43 mi
1:22:22
Rank: #4389 (+37)
15K → 20K
20:49 | 6:42/mi
Half· 13.11 mi
1:26:50
Rank: #4356 (+33)
20K → Half
4:28 | 6:33/mi
25K· 15.53 mi
1:43:21
Rank: #4395 (-39)
Half → 25K
16:31 | 6:49/mi
30K· 18.64 mi
2:05:38
Rank: #4646 (-251)
25K → 30K
22:17 | 7:10/mi
20M
2:18:37
Rank: #5945 (-1299)
30K → 20M
12:59 | 9:33/mi
21M
2:27:18
Rank: #6174 (-229)
20M → 21M
8:41 | 8:41/mi
35K· 21.75 mi
2:34:41
Rank: #6702 (-528)
21M → 35K
7:23 | 9:52/mi
23M
2:46:12
Rank: #7289 (-587)
35K → 23M
11:31 | 9:12/mi
24M
2:53:26
Rank: #7178 (+111)
23M → 24M
7:14 | 7:14/mi
40K· 24.85 mi
2:59:58
Rank: #7158 (+20)
24M → 40K
6:32 | 7:38/mi
25.2M
3:02:49
Rank: #7136 (+22)
40K → 25.2M
2:51 | 8:16/mi
Finish· 26.22 mi
3:10:05
Rank: #7085 (+51)
25.2M → Finish
7:16 | 7:08/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:26:50
Pace6:37 /mi
2nd Half
Distance13.11 mi
Time1:43:15
Pace7:53 /mi
📊Positive Split: 18.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:23:2620:386:3820:38
6:38
-
10K
6.21 mi10:43:4740:596:3620:21
6:33
-0:05
15K
9.32 mi11:04:211:01:336:3620:34
6:37
+0:04
20K
12.43 mi11:25:101:22:226:3820:49
6:42
+0:05
Half
13.11 mi11:29:381:26:506:374:28
6:33
-0:09
25K
15.53 mi11:46:091:43:216:3916:31
6:49
+0:16
30K
18.64 mi12:08:262:05:386:4422:17
7:10
+0:21
20M
20.00 mi12:21:252:18:376:5612:59
9:33
+2:23
21M
21.00 mi12:30:062:27:187:018:41
8:41
-0:52
35K
21.75 mi12:37:292:34:417:077:23
9:52
+1:11
23M
23.00 mi12:49:002:46:127:1411:31
9:12
-0:40
24M
24.00 mi12:56:142:53:267:147:14
7:14
-1:58
40K
24.85 mi13:02:462:59:587:146:32
7:38
+0:24
25.2M
25.20 mi13:05:373:02:497:152:51
8:16
+0:38
Finish
26.22 mi13:12:533:10:057:157:16
7:08
-1:08

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

6:33 /mi

Average Pace

7:15 /mi

Slowest Pace

9:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

24:49

13% of race

Time at Steady Pace

2:01:51

64% of race

Time at Slower Pace

43:25

23% of race

Average Pace: 7:15 /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 mi10:23:2620:386:3820:38
6:38
#4945
10K
6.21 mi10:43:4740:596:3620:21
6:33
#4467
15K
9.32 mi11:04:211:01:336:3620:34
6:37
#4426
20K
12.43 mi11:25:101:22:226:3820:49
6:42
#4389
Half
13.11 mi11:29:381:26:506:374:28
6:33
#4356
25K
15.53 mi11:46:091:43:216:3916:31
6:49
#4395
30K
18.64 mi12:08:262:05:386:4422:17
7:10
#4646
20M
20.00 mi12:21:252:18:376:5612:59
9:33
#5945
21M
21.00 mi12:30:062:27:187:018:41
8:41
#6174
35K
21.75 mi12:37:292:34:417:077:23
9:52
#6702
23M
23.00 mi12:49:002:46:127:1411:31
9:12
#7289
24M
24.00 mi12:56:142:53:267:147:14
7:14
#7178
40K
24.85 mi13:02:462:59:587:146:32
7:38
#7158
25.2M
25.20 mi13:05:373:02:497:152:51
8:16
#7136
Finish
26.22 mi13:12:533:10:057:157:16
7:08
#7085
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi4945462946294395(Top 15%)4125(Top 26%)4125(Top 73%)
10K6.21 mi3.10 mi4467+4784200+4294200+4294075(Top 14%)3833(Top 24%)3833(Top 68%)
15K9.32 mi3.11 mi4426+414162+384162+384395(Top 15%)4125(Top 26%)4125(Top 73%)
20K12.43 mi3.11 mi4389+374121+414121+414433(Top 16%)4137(Top 26%)4137(Top 73%)
Half13.11 mi0.68 mi4356+334089+324089+324010(Top 14%)3774(Top 23%)3774(Top 67%)
25K15.53 mi2.42 mi4395-394118-294118-294969(Top 17%)4563(Top 28%)4563(Top 81%)
30K18.64 mi3.11 mi4646-2514318-2004318-2005745(Top 20%)5127(Top 32%)5127(Top 91%)
20M20.00 mi1.36 mi5945-12995379-10615379-106119385(Top 68%)11860(Top 74%)11860(Top 210%)
21M21.00 mi1.00 mi6174-2295543-1645543-16411528(Top 41%)8121(Top 50%)8121(Top 144%)
35K21.75 mi0.75 mi6702-5285925-3825925-38221502(Top 76%)12662(Top 79%)12662(Top 224%)
23M23.00 mi1.25 mi7289-5876282-3576282-35717295(Top 61%)10641(Top 66%)10641(Top 189%)
24M24.00 mi1.00 mi7178+1116181+1016181+1016003(Top 21%)4917(Top 31%)4917(Top 87%)
40K24.85 mi0.85 mi7158+206143+386143+387663(Top 27%)5801(Top 36%)5801(Top 103%)
25.2M25.20 mi0.35 mi7136+226110+336110+337362(Top 26%)5527(Top 34%)5527(Top 98%)
Finish26.22 mi1.02 mi7085+516051+596051+596545(Top 23%)5057(Top 31%)5057(Top 90%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 15%
×21stories
+97ft-345ft

Overall

4395

Males

4125

M18-39

4125

5K→10K

3.1 - 6.2 mi

Top 14%
×5stories
+79ft-138ft

Overall

4075

Males

3833

M18-39

3833

10K→15K

6.2 - 9.3 mi

Top 15%
×3stories
+67ft-78ft

Overall

4395

Males

4125

M18-39

4125

15K→20K

9.3 - 12.4 mi

Top 16%
×5stories
+106ft-86ft

Overall

4433

Males

4137

M18-39

4137

20K→Half

12.4 - 13.1 mi

Top 14%
×2stories
+19ft-37ft

Overall

4010

Males

3774

M18-39

3774

Half→25K

13.1 - 15.5 mi

Top 17%
×4stories
+66ft-88ft

Overall

4969

Males

4563

M18-39

4563

25K→30K

15.5 - 18.6 mi

Top 20%
×9stories
+181ft-148ft

Overall

5745

Males

5127

M18-39

5127

30K→20M

18.6 - 20.0 mi

Top 68%
×5stories
+64ft-50ft

Overall

19385

Males

11860

M18-39

11860

20M→21M

20.0 - 21.0 mi

Top 41%
×8stories
+106ft-24ft

Overall

11528

Males

8121

M18-39

8121

21M→35K

21.0 - 21.8 mi

Top 76%
×7stories
+17ft-86ft

Overall

21502

Males

12662

M18-39

12662

35K→23M

21.8 - 23.0 mi

Top 61%
×5stories
+23ft-63ft

Overall

17295

Males

10641

M18-39

10641

23M→24M

23.0 - 24.0 mi

Top 21%
×6stories
+12ft-82ft

Overall

6003

Males

4917

M18-39

4917

24M→40K

24.0 - 24.9 mi

Top 27%
×1story
+6ft-20ft

Overall

7663

Males

5801

M18-39

5801

40K→25.2M

24.9 - 25.2 mi

Top 26%
×1story
+13ft-16ft

Overall

7362

Males

5527

M18-39

5527

25.2M→Finish

25.2 - 26.2 mi

Top 23%
×2stories
+22ft-21ft

Overall

6545

Males

5057

M18-39

5057

Passing Analysis

Category:
Athletes Passed
1323
Passed By
3463
Net Change
-2140
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4945
5K → 10K50325+478#4945#4467
10K → 15K11473+41#4467#4426
15K → 20K11982+37#4426#4389
20K → Half4310+33#4389#4356
Half → 25K81120-39#4356#4395
25K → 30K85336-251#4395#4646
30K → 20M21301-1299#4646#5945
20M → 21M20249-229#5945#6174
21M → 35K5533-528#6174#6702
35K → 23M21608-587#6702#7289
23M → 24M13322+111#7289#7178
24M → 40K6343+20#7178#7158
40K → 25.2M3917+22#7158#7136
25.2M → Finish9544+51#7136#7085
TOTALS13233463-2140
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing