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BOSTON MARATHON 2025

Chien-Kuo Tsao

Bib: 12617•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M50-54)
#0 / 1996
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
7:03/mi
21:55
↑ 97↓ 3451.5%
10K· 6.21 mi
7:37/mi
45:35
↑ 79↓ 1380.4%
15K· 9.32 mi
8:16/mi
1:11:16
↑ 67↓ 78
20K· 12.43 mi
8:27/mi
1:37:30
↑ 106↓ 860.1%
Half· 13.11 mi
8:15/mi
1:43:08
↑ 19↓ 370.5%
25K· 15.53 mi
8:59/mi
2:04:54
↑ 66↓ 880.2%
30K· 18.64 mi
11:23/mi
2:40:17
↑ 181↓ 1480.2%
20M
10:53/mi
2:55:04
↑ 64↓ 500.2%
21M
11:34/mi
3:06:38
↑ 106↓ 241.6%
35K· 21.75 mi
12:08/mi
3:15:43
↑ 17↓ 861.7%
23M
15:40/mi
3:35:20
↑ 23↓ 630.6%
24M
13:03/mi
3:48:23
↓ 821.3%
40K· 24.85 mi
12:37/mi
3:59:10
↓ 200.3%
25.2M
11:27/mi
4:03:07
↑ 13↓ 160.2%
Finish· 26.22 mi
9:18/mi
4:12:36
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:43:08
Pace7:52 /mi
2nd Half
Distance13.11 mi
Time2:29:28
Pace11:24 /mi
📊Positive Split: 44.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:00:5421:557:0321:55
7:03
-
10K
6.21 mi11:24:3445:357:2023:40
7:37
+0:34
15K
9.32 mi11:50:151:11:167:3925:41
8:16
+0:39
20K
12.43 mi12:16:291:37:307:5126:14
8:27
+0:11
Half
13.11 mi12:22:071:43:087:525:38
8:15
-0:12
25K
15.53 mi12:43:532:04:548:0221:46
8:59
+0:44
30K
18.64 mi13:19:162:40:178:3635:23
11:23
+2:24
20M
20.00 mi13:34:032:55:048:4514:47
10:53
-0:30
21M
21.00 mi13:45:373:06:388:5311:34
11:34
+0:41
35K
21.75 mi13:54:423:15:439:009:05
12:08
+0:34
23M
23.00 mi14:14:193:35:209:2219:37
15:40
+3:32
24M
24.00 mi14:27:223:48:239:3113:03
13:03
-2:37
40K
24.85 mi14:38:093:59:109:3710:47
12:37
-0:26
25.2M
25.20 mi14:42:064:03:079:393:57
11:27
-1:10
Finish
26.22 mi14:51:354:12:369:389:29
9:18
-2:09

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

7:03 /mi

Average Pace

9:38 /mi

Slowest Pace

15:40 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:14:23

53% of race

Time at Steady Pace

1:05:41

26% of race

Time at Slower Pace

52:32

21% of race

Average Pace: 9:38 /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 mi11:00:5421:557:0321:55
7:03
#8257
10K
6.21 mi11:24:3445:357:2023:40
7:37
#10640
15K
9.32 mi11:50:151:11:167:3925:41
8:16
#13284
20K
12.43 mi12:16:291:37:307:5126:14
8:27
#14638
Half
13.11 mi12:22:071:43:087:525:38
8:15
#14806
25K
15.53 mi12:43:532:04:548:0221:46
8:59
#15887
30K
18.64 mi13:19:162:40:178:3635:23
11:23
#18743
20M
20.00 mi13:34:032:55:048:4514:47
10:53
#19310
21M
21.00 mi13:45:373:06:388:5311:34
11:34
#19641
35K
21.75 mi13:54:423:15:439:009:05
12:08
#20121
23M
23.00 mi14:14:193:35:209:2219:37
15:40
#21477
24M
24.00 mi14:27:223:48:239:3113:03
13:03
#21906
40K
24.85 mi14:38:093:59:109:3710:47
12:37
#22151
25.2M
25.20 mi14:42:064:03:079:393:57
11:27
#22149
Finish
26.22 mi14:51:354:12:369:389:29
9:18
#22073
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi82577163716317825(Top 63%)11560(Top 72%)11560(Top 579%)
10K6.21 mi3.10 mi10640-23838483-13208483-132013175(Top 46%)9667(Top 60%)9667(Top 484%)
15K9.32 mi3.11 mi13284-26449686-12039686-120317825(Top 63%)11560(Top 72%)11560(Top 579%)
20K12.43 mi3.11 mi14638-135410230-54410230-54417828(Top 63%)11537(Top 72%)11537(Top 578%)
Half13.11 mi0.68 mi14806-16810285-5510285-5517649(Top 62%)11491(Top 71%)11491(Top 576%)
25K15.53 mi2.42 mi15887-108110741-45610741-45619790(Top 70%)12327(Top 77%)12327(Top 618%)
30K18.64 mi3.11 mi18743-285611894-115311894-115324675(Top 87%)14387(Top 89%)14387(Top 721%)
20M20.00 mi1.36 mi19310-56712097-20312097-20323327(Top 82%)13676(Top 85%)13676(Top 685%)
21M21.00 mi1.00 mi19641-33112217-12012217-12022740(Top 80%)13318(Top 83%)13318(Top 667%)
35K21.75 mi0.75 mi20121-48012409-19212409-19226054(Top 92%)14858(Top 92%)14858(Top 744%)
23M23.00 mi1.25 mi21477-135613005-59613005-59628093(Top 99%)15899(Top 99%)15899(Top 797%)
24M24.00 mi1.00 mi21906-42913160-15513160-15526911(Top 95%)15249(Top 95%)15249(Top 764%)
40K24.85 mi0.85 mi22151-24513250-9013250-9025805(Top 91%)14692(Top 91%)14692(Top 736%)
25.2M25.20 mi0.35 mi22149+213244+613244+621916(Top 77%)12747(Top 79%)12747(Top 639%)
Finish26.22 mi1.02 mi22073+7613193+5113193+5120399(Top 72%)12010(Top 75%)12010(Top 602%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 63%
×21story building
+97ft-345ft

Overall

17825

Males

11560

M50-54

11560

5K→10K

3.1 - 6.2 mi

Top 46%
×5story building
+79ft-138ft

Overall

13175

Males

9667

M50-54

9667

10K→15K

6.2 - 9.3 mi

Top 63%
×3story building
+67ft-78ft

Overall

17825

Males

11560

M50-54

11560

15K→20K

9.3 - 12.4 mi

Top 63%
×5story building
+106ft-86ft

Overall

17828

Males

11537

M50-54

11537

20K→Half

12.4 - 13.1 mi

Top 62%
×2story building
+19ft-37ft

Overall

17649

Males

11491

M50-54

11491

Half→25K

13.1 - 15.5 mi

Top 70%
×4story building
+66ft-88ft

Overall

19790

Males

12327

M50-54

12327

25K→30K

15.5 - 18.6 mi

Top 87%
×9story building
+181ft-148ft

Overall

24675

Males

14387

M50-54

14387

30K→20M

18.6 - 20.0 mi

Top 82%
×5story building
+64ft-50ft

Overall

23327

Males

13676

M50-54

13676

20M→21M

20.0 - 21.0 mi

Top 80%
×8story building
+106ft-24ft

Overall

22740

Males

13318

M50-54

13318

21M→35K

21.0 - 21.8 mi

Top 92%
×7story building
+17ft-86ft

Overall

26054

Males

14858

M50-54

14858

35K→23M

21.8 - 23.0 mi

Top 99%
×5story building
+23ft-63ft

Overall

28093

Males

15899

M50-54

15899

23M→24M

23.0 - 24.0 mi

Top 95%
×6story building
+12ft-82ft

Overall

26911

Males

15249

M50-54

15249

24M→40K

24.0 - 24.9 mi

Top 91%
×1story
+6ft-20ft

Overall

25805

Males

14692

M50-54

14692

40K→25.2M

24.9 - 25.2 mi

Top 77%
×1story
+13ft-16ft

Overall

21916

Males

12747

M50-54

12747

25.2M→Finish

25.2 - 26.2 mi

Top 72%
×2story building
+22ft-21ft

Overall

20399

Males

12010

M50-54

12010

Passing Analysis

Category:
Athletes Passed
282
Passed By
14096
Net Change
-13816
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8257
5K → 10K42385-2383#8257#10640
10K → 15K72651-2644#10640#13284
15K → 20K311385-1354#13284#14638
20K → Half7175-168#14638#14806
Half → 25K271108-1081#14806#15887
25K → 30K102866-2856#15887#18743
30K → 20M21588-567#18743#19310
20M → 21M38369-331#19310#19641
21M → 35K5485-480#19641#20121
35K → 23M71363-1356#20121#21477
23M → 24M5434-429#21477#21906
24M → 40K7252-245#21906#22151
40K → 25.2M2018+2#22151#22149
25.2M → Finish9317+76#22149#22073
TOTALS28214096-13816
📊

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