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BOSTON MARATHON 2025

Johny Chau

Bib: 25794•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
28:24
Rank: #22998
Start → 5K
9:08/mi
28:24 split
10K· 6.21 mi
55:55
Rank: #22422 (+576)
5K → 10K
8:51/mi
27:31 split
15K· 9.32 mi
1:22:50
Rank: #21753 (+669)
10K → 15K
8:40/mi
26:55 split
20K· 12.43 mi
1:51:25
Rank: #21777 (-24)
15K → 20K
9:12/mi
28:35 split
Half· 13.11 mi
1:57:26
Rank: #21727 (+50)
20K → Half
8:49/mi
6:01 split
25K· 15.53 mi
2:19:18
Rank: #21421 (+306)
Half → 25K
9:01/mi
21:52 split
30K· 18.64 mi
2:49:34
Rank: #21316 (+105)
25K → 30K
9:45/mi
30:16 split
20M
3:04:34
Rank: #21583 (-267)
30K → 20M
11:02/mi
15:00 split
21M
3:14:29
Rank: #21360 (+223)
20M → 21M
9:55/mi
9:55 split
35K· 21.75 mi
3:21:08
Rank: #21242 (+118)
21M → 35K
8:53/mi
6:39 split
23M
3:32:37
Rank: #21004 (+238)
35K → 23M
9:10/mi
11:29 split
24M
3:41:29
Rank: #20856 (+148)
23M → 24M
8:52/mi
8:52 split
40K· 24.85 mi
3:49:31
Rank: #20758 (+98)
24M → 40K
9:24/mi
8:02 split
25.2M
3:52:52
Rank: #20688 (+70)
40K → 25.2M
9:43/mi
3:21 split
Finish· 26.22 mi
4:01:50
Rank: #20615 (+73)
25.2M → Finish
8:48/mi
8:58 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:57:26
Pace8:57 /mi
2nd Half
Distance13.11 mi
Time2:04:24
Pace9:29 /mi
📊Positive Split: 5.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:43:4828:249:0828:24
9:08
-
10K
6.21 mi12:11:1955:559:0027:31
8:51
-0:17
15K
9.32 mi12:38:141:22:508:5326:55
8:40
-0:11
20K
12.43 mi13:06:491:51:258:5828:35
9:12
+0:32
Half
13.11 mi13:12:501:57:268:576:01
8:49
-0:23
25K
15.53 mi13:34:422:19:188:5821:52
9:01
+0:12
30K
18.64 mi14:04:582:49:349:0630:16
9:45
+0:44
20M
20.00 mi14:19:583:04:349:1415:00
11:02
+1:17
21M
21.00 mi14:29:533:14:299:169:55
9:55
-1:07
35K
21.75 mi14:36:323:21:089:156:39
8:53
-1:02
23M
23.00 mi14:48:013:32:379:1511:29
9:10
+0:17
24M
24.00 mi14:56:533:41:299:148:52
8:52
-0:18
40K
24.85 mi15:04:553:49:319:148:02
9:24
+0:32
25.2M
25.20 mi15:08:163:52:529:143:21
9:43
+0:19
Finish
26.22 mi15:17:144:01:509:148:58
8:48
-0:55

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

8:40 /mi

Average Pace

9:14 /mi

Slowest Pace

11:02 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

41:54

17% of race

Time at Steady Pace

2:21:24

58% of race

Time at Slower Pace

58:32

24% of race

Average Pace: 9:13 /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 mi11:43:4828:249:0828:24
9:08
#22998
10K
6.21 mi12:11:1955:559:0027:31
8:51
#22422
15K
9.32 mi12:38:141:22:508:5326:55
8:40
#21753
20K
12.43 mi13:06:491:51:258:5828:35
9:12
#21777
Half
13.11 mi13:12:501:57:268:576:01
8:49
#21727
25K
15.53 mi13:34:422:19:188:5821:52
9:01
#21421
30K
18.64 mi14:04:582:49:349:0630:16
9:45
#21316
20M
20.00 mi14:19:583:04:349:1415:00
11:02
#21583
21M
21.00 mi14:29:533:14:299:169:55
9:55
#21360
35K
21.75 mi14:36:323:21:089:156:39
8:53
#21242
23M
23.00 mi14:48:013:32:379:1511:29
9:10
#21004
24M
24.00 mi14:56:533:41:299:148:52
8:52
#20856
40K
24.85 mi15:04:553:49:319:148:02
9:24
#20758
25.2M
25.20 mi15:08:163:52:529:143:21
9:43
#20688
Finish
26.22 mi15:17:144:01:509:148:58
8:48
#20615
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi22998137631376320264(Top 71%)12633(Top 78%)12633(Top 224%)
10K6.21 mi3.10 mi22422+57613510+25313510+25321662(Top 76%)13198(Top 82%)13198(Top 234%)
15K9.32 mi3.11 mi21753+66913224+28613224+28620264(Top 71%)12633(Top 78%)12633(Top 224%)
20K12.43 mi3.11 mi21777-2413236-1213236-1221888(Top 77%)13301(Top 83%)13301(Top 236%)
Half13.11 mi0.68 mi21727+5013214+2213214+2220965(Top 74%)12878(Top 80%)12878(Top 228%)
25K15.53 mi2.42 mi21421+30613080+13413080+13419986(Top 70%)12407(Top 77%)12407(Top 220%)
30K18.64 mi3.11 mi21316+10512998+8212998+8220812(Top 73%)12631(Top 78%)12631(Top 224%)
20M20.00 mi1.36 mi21583-26713115-11713115-11723658(Top 83%)13824(Top 86%)13824(Top 245%)
21M21.00 mi1.00 mi21360+22312986+12912986+12917974(Top 63%)11156(Top 69%)11156(Top 198%)
35K21.75 mi0.75 mi21242+11812924+6212924+6217698(Top 62%)10924(Top 68%)10924(Top 194%)
23M23.00 mi1.25 mi21004+23812784+14012784+14017197(Top 61%)10602(Top 66%)10602(Top 188%)
24M24.00 mi1.00 mi20856+14812698+8612698+8616667(Top 59%)10332(Top 64%)10332(Top 183%)
40K24.85 mi0.85 mi20758+9812639+5912639+5918261(Top 64%)10967(Top 68%)10967(Top 194%)
25.2M25.20 mi0.35 mi20688+7012607+3212607+3215674(Top 55%)9740(Top 60%)9740(Top 173%)
Finish26.22 mi1.02 mi20615+7312554+5312554+5318026(Top 63%)10889(Top 68%)10889(Top 193%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 71%
×21story building
+97ft-345ft

Overall

20264

Males

12633

M18-39

12633

5K→10K

3.1 - 6.2 mi

Top 76%
×5story building
+79ft-138ft

Overall

21662

Males

13198

M18-39

13198

10K→15K

6.2 - 9.3 mi

Top 71%
×3story building
+67ft-78ft

Overall

20264

Males

12633

M18-39

12633

15K→20K

9.3 - 12.4 mi

Top 77%
×5story building
+106ft-86ft

Overall

21888

Males

13301

M18-39

13301

20K→Half

12.4 - 13.1 mi

Top 74%
×2story building
+19ft-37ft

Overall

20965

Males

12878

M18-39

12878

Half→25K

13.1 - 15.5 mi

Top 70%
×4story building
+66ft-88ft

Overall

19986

Males

12407

M18-39

12407

25K→30K

15.5 - 18.6 mi

Top 73%
×9story building
+181ft-148ft

Overall

20812

Males

12631

M18-39

12631

30K→20M

18.6 - 20.0 mi

Top 83%
×5story building
+64ft-50ft

Overall

23658

Males

13824

M18-39

13824

20M→21M

20.0 - 21.0 mi

Top 63%
×8story building
+106ft-24ft

Overall

17974

Males

11156

M18-39

11156

21M→35K

21.0 - 21.8 mi

Top 62%
×7story building
+17ft-86ft

Overall

17698

Males

10924

M18-39

10924

35K→23M

21.8 - 23.0 mi

Top 61%
×5story building
+23ft-63ft

Overall

17197

Males

10602

M18-39

10602

23M→24M

23.0 - 24.0 mi

Top 59%
×6story building
+12ft-82ft

Overall

16667

Males

10332

M18-39

10332

24M→40K

24.0 - 24.9 mi

Top 64%
×1story
+6ft-20ft

Overall

18261

Males

10967

M18-39

10967

40K→25.2M

24.9 - 25.2 mi

Top 55%
×1story
+13ft-16ft

Overall

15674

Males

9740

M18-39

9740

25.2M→Finish

25.2 - 26.2 mi

Top 63%
×2story building
+22ft-21ft

Overall

18026

Males

10889

M18-39

10889

Passing Analysis

Category:
Athletes Passed
3179
Passed By
796
Net Change
+2383
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22998
5K → 10K63660+576#22998#22422
10K → 15K68415+669#22422#21753
15K → 20K181205-24#21753#21777
20K → Half6313+50#21777#21727
Half → 25K32418+306#21727#21421
25K → 30K241136+105#21421#21316
30K → 20M34301-267#21316#21583
20M → 21M2285+223#21583#21360
21M → 35K1268+118#21360#21242
35K → 23M2424+238#21242#21004
23M → 24M1579+148#21004#20856
24M → 40K1046+98#20856#20758
40K → 25.2M711+70#20758#20688
25.2M → Finish8815+73#20688#20615
TOTALS3179796+2383
📊

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