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BOSTON MARATHON 2025

Nga Hong Chow

Bib: 9725•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 33%
Gender (Male)
#0 / 16105
Top 46%
Masters (Masters Men)
#0 / 10463
Top 34%
Division (M45-49)
#0 / 2386
Top 49%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:51
Rank: #8075
Start → 5K
21:51 | 7:02/mi
10K· 6.21 mi
43:24
Rank: #7746 (+329)
5K → 10K
21:33 | 6:56/mi
15K· 9.32 mi
1:05:24
Rank: #7870 (-124)
10K → 15K
22:00 | 7:05/mi
20K· 12.43 mi
1:28:01
Rank: #8050 (-180)
15K → 20K
22:37 | 7:17/mi
Half· 13.11 mi
1:32:54
Rank: #8075 (-25)
20K → Half
4:53 | 7:09/mi
25K· 15.53 mi
1:50:45
Rank: #8136 (-61)
Half → 25K
17:51 | 7:22/mi
30K· 18.64 mi
2:14:53
Rank: #8308 (-172)
25K → 30K
24:08 | 7:46/mi
20M
2:25:52
Rank: #8480 (-172)
30K → 20M
10:59 | 8:05/mi
21M
2:34:41
Rank: #8689 (-209)
20M → 21M
8:49 | 8:49/mi
35K· 21.75 mi
2:40:28
Rank: #8731 (-42)
21M → 35K
5:47 | 7:44/mi
23M
2:50:44
Rank: #8841 (-110)
35K → 23M
10:16 | 8:12/mi
24M
2:58:54
Rank: #8977 (-136)
23M → 24M
8:10 | 8:10/mi
40K· 24.85 mi
3:06:03
Rank: #9114 (-137)
24M → 40K
7:09 | 8:22/mi
25.2M
3:09:18
Rank: #9196 (-82)
40K → 25.2M
3:15 | 9:25/mi
Finish· 26.22 mi
3:17:16
Rank: #9286 (-90)
25.2M → Finish
7:58 | 7:49/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:32:54
Pace7:05 /mi
2nd Half
Distance13.11 mi
Time1:44:22
Pace7:58 /mi
📊Positive Split: 12.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:48:0521:517:0221:51
7:02
-
10K
6.21 mi11:09:3843:246:5921:33
6:56
-0:06
15K
9.32 mi11:31:381:05:247:0122:00
7:05
+0:09
20K
12.43 mi11:54:151:28:017:0522:37
7:17
+0:12
Half
13.11 mi11:59:081:32:547:054:53
7:09
-0:08
25K
15.53 mi12:16:591:50:457:0817:51
7:22
+0:13
30K
18.64 mi12:41:072:14:537:1424:08
7:46
+0:24
20M
20.00 mi12:52:062:25:527:1810:59
8:05
+0:19
21M
21.00 mi13:00:552:34:417:228:49
8:49
+0:44
35K
21.75 mi13:06:422:40:287:235:47
7:44
-1:05
23M
23.00 mi13:16:582:50:447:2510:16
8:12
+0:28
24M
24.00 mi13:25:082:58:547:278:10
8:10
-0:02
40K
24.85 mi13:32:173:06:037:297:09
8:22
+0:12
25.2M
25.20 mi13:35:323:09:187:313:15
9:25
+1:03
Finish
26.22 mi13:43:303:17:167:327:58
7:49
-1:36

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

6:56 /mi

Average Pace

7:32 /mi

Slowest Pace

9:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:50:45

56% of race

Time at Steady Pace

48:52

25% of race

Time at Slower Pace

37:39

19% of race

Average Pace: 7:31 /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 mi10:48:0521:517:0221:51
7:02
#8075
10K
6.21 mi11:09:3843:246:5921:33
6:56
#7746
15K
9.32 mi11:31:381:05:247:0122:00
7:05
#7870
20K
12.43 mi11:54:151:28:017:0522:37
7:17
#8050
Half
13.11 mi11:59:081:32:547:054:53
7:09
#8075
25K
15.53 mi12:16:591:50:457:0817:51
7:22
#8136
30K
18.64 mi12:41:072:14:537:1424:08
7:46
#8308
20M
20.00 mi12:52:062:25:527:1810:59
8:05
#8480
21M
21.00 mi13:00:552:34:417:228:49
8:49
#8689
35K
21.75 mi13:06:422:40:287:235:47
7:44
#8731
23M
23.00 mi13:16:582:50:447:2510:16
8:12
#8841
24M
24.00 mi13:25:082:58:547:278:10
8:10
#8977
40K
24.85 mi13:32:173:06:037:297:09
8:22
#9114
25.2M
25.20 mi13:35:323:09:187:313:15
9:25
#9196
Finish
26.22 mi13:43:303:17:167:327:58
7:49
#9286
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi8075705170518207(Top 29%)7065(Top 44%)7065(Top 296%)
10K6.21 mi3.10 mi7746+3296820+2316820+2317518(Top 26%)6657(Top 41%)6657(Top 279%)
15K9.32 mi3.11 mi7870-1246895-756895-758207(Top 29%)7065(Top 44%)7065(Top 296%)
20K12.43 mi3.11 mi8050-1806989-946989-948870(Top 31%)7381(Top 46%)7381(Top 309%)
Half13.11 mi0.68 mi8075-257001-127001-128717(Top 31%)7329(Top 46%)7329(Top 307%)
25K15.53 mi2.42 mi8136-617007-67007-68831(Top 31%)7242(Top 45%)7242(Top 304%)
30K18.64 mi3.11 mi8308-1727064-577064-579665(Top 34%)7511(Top 47%)7511(Top 315%)
20M20.00 mi1.36 mi8480-1727139-757139-7510951(Top 39%)7999(Top 50%)7999(Top 335%)
21M21.00 mi1.00 mi8689-2097219-807219-8012358(Top 44%)8531(Top 53%)8531(Top 358%)
35K21.75 mi0.75 mi8731-427226-77226-710246(Top 36%)7480(Top 46%)7480(Top 313%)
23M23.00 mi1.25 mi8841-1107249-237249-2311335(Top 40%)7902(Top 49%)7902(Top 331%)
24M24.00 mi1.00 mi8977-1367289-407289-4012310(Top 43%)8318(Top 52%)8318(Top 349%)
40K24.85 mi0.85 mi9114-1377340-517340-5112502(Top 44%)8272(Top 51%)8272(Top 347%)
25.2M25.20 mi0.35 mi9196-827360-207360-2014050(Top 49%)8935(Top 55%)8935(Top 374%)
Finish26.22 mi1.02 mi9286-907372-127372-1211530(Top 41%)7775(Top 48%)7775(Top 326%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 29%
×21stories
+97ft-345ft

Overall

8207

Males

7065

M45-49

7065

5K→10K

3.1 - 6.2 mi

Top 26%
×5stories
+79ft-138ft

Overall

7518

Males

6657

M45-49

6657

10K→15K

6.2 - 9.3 mi

Top 29%
×3stories
+67ft-78ft

Overall

8207

Males

7065

M45-49

7065

15K→20K

9.3 - 12.4 mi

Top 31%
×5stories
+106ft-86ft

Overall

8870

Males

7381

M45-49

7381

20K→Half

12.4 - 13.1 mi

Top 31%
×2stories
+19ft-37ft

Overall

8717

Males

7329

M45-49

7329

Half→25K

13.1 - 15.5 mi

Top 31%
×4stories
+66ft-88ft

Overall

8831

Males

7242

M45-49

7242

25K→30K

15.5 - 18.6 mi

Top 34%
×9stories
+181ft-148ft

Overall

9665

Males

7511

M45-49

7511

30K→20M

18.6 - 20.0 mi

Top 39%
×5stories
+64ft-50ft

Overall

10951

Males

7999

M45-49

7999

20M→21M

20.0 - 21.0 mi

Top 44%
×8stories
+106ft-24ft

Overall

12358

Males

8531

M45-49

8531

21M→35K

21.0 - 21.8 mi

Top 36%
×7stories
+17ft-86ft

Overall

10246

Males

7480

M45-49

7480

35K→23M

21.8 - 23.0 mi

Top 40%
×5stories
+23ft-63ft

Overall

11335

Males

7902

M45-49

7902

23M→24M

23.0 - 24.0 mi

Top 43%
×6stories
+12ft-82ft

Overall

12310

Males

8318

M45-49

8318

24M→40K

24.0 - 24.9 mi

Top 44%
×1story
+6ft-20ft

Overall

12502

Males

8272

M45-49

8272

40K→25.2M

24.9 - 25.2 mi

Top 49%
×1story
+13ft-16ft

Overall

14050

Males

8935

M45-49

8935

25.2M→Finish

25.2 - 26.2 mi

Top 41%
×2stories
+22ft-21ft

Overall

11530

Males

7775

M45-49

7775

Passing Analysis

Category:
Athletes Passed
1236
Passed By
2447
Net Change
-1211
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8075
5K → 10K41283+329#8075#7746
10K → 15K93217-124#7746#7870
15K → 20K85265-180#7870#8050
20K → Half1843-25#8050#8075
Half → 25K115176-61#8075#8136
25K → 30K138310-172#8136#8308
30K → 20M54226-172#8308#8480
20M → 21M43252-209#8480#8689
21M → 35K4587-42#8689#8731
35K → 23M87197-110#8731#8841
23M → 24M36172-136#8841#8977
24M → 40K49186-137#8977#9114
40K → 25.2M1799-82#9114#9196
25.2M → Finish44134-90#9196#9286
TOTALS12362447-1211
📊

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