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BOSTON MARATHON 2025

Cai Chao

Bib: 9270•F

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 24%
Gender (Female)
#0 / 12228
Top 8%
Division (F18-39)
#0 / 5469
Top 15%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:55
Rank: #8265
Start → 5K
21:55 | 7:03/mi
10K· 6.21 mi
44:08
Rank: #8660 (-395)
5K → 10K
22:13 | 7:09/mi
15K· 9.32 mi
1:06:26
Rank: #8724 (-64)
10K → 15K
22:18 | 7:11/mi
20K· 12.43 mi
1:29:02
Rank: #8679 (+45)
15K → 20K
22:36 | 7:16/mi
Half· 13.11 mi
1:33:48
Rank: #8585 (+94)
20K → Half
4:46 | 6:59/mi
25K· 15.53 mi
1:51:13
Rank: #8353 (+232)
Half → 25K
17:25 | 7:11/mi
30K· 18.64 mi
2:14:13
Rank: #8022 (+331)
25K → 30K
23:00 | 7:24/mi
20M
2:24:18
Rank: #7865 (+157)
30K → 20M
10:05 | 7:25/mi
21M
2:32:15
Rank: #7747 (+118)
20M → 21M
7:57 | 7:57/mi
35K· 21.75 mi
2:37:33
Rank: #7637 (+110)
21M → 35K
5:18 | 7:05/mi
23M
2:46:41
Rank: #7433 (+204)
35K → 23M
9:08 | 7:18/mi
24M
2:53:48
Rank: #7285 (+148)
23M → 24M
7:07 | 7:07/mi
40K· 24.85 mi
2:59:54
Rank: #7145 (+140)
24M → 40K
6:06 | 7:08/mi
25.2M
3:02:31
Rank: #7062 (+83)
40K → 25.2M
2:37 | 7:35/mi
Finish· 26.22 mi
3:09:22
Rank: #6872 (+190)
25.2M → Finish
6:51 | 6:43/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:33:48
Pace7:09 /mi
2nd Half
Distance13.11 mi
Time1:35:34
Pace7:17 /mi
📊Positive Split: 1.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:47:1721:557:0321:55
7:03
-
10K
6.21 mi11:09:3044:087:0622:13
7:09
+0:06
15K
9.32 mi11:31:481:06:267:0822:18
7:11
+0:02
20K
12.43 mi11:54:241:29:027:1022:36
7:16
+0:05
Half
13.11 mi11:59:101:33:487:094:46
6:59
-0:17
25K
15.53 mi12:16:351:51:137:1017:25
7:11
+0:12
30K
18.64 mi12:39:352:14:137:1223:00
7:24
+0:13
20M
20.00 mi12:49:402:24:187:1310:05
7:25
+0:01
21M
21.00 mi12:57:372:32:157:157:57
7:57
+0:32
35K
21.75 mi13:02:552:37:337:155:18
7:05
-0:52
23M
23.00 mi13:12:032:46:417:159:08
7:18
+0:13
24M
24.00 mi13:19:102:53:487:157:07
7:07
-0:11
40K
24.85 mi13:25:162:59:547:146:06
7:08
+0:01
25.2M
25.20 mi13:27:533:02:317:152:37
7:35
+0:27
Finish
26.22 mi13:34:443:09:227:146:51
6:43
-0:52

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

6:43 /mi

Average Pace

7:14 /mi

Slowest Pace

7:57 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:25:43

77% of race

Time at Steady Pace

35:42

19% of race

Time at Slower Pace

7:57

4% of race

Average Pace: 7:13 /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 mi10:47:1721:557:0321:55
7:03
#8265
10K
6.21 mi11:09:3044:087:0622:13
7:09
#8660
15K
9.32 mi11:31:481:06:267:0822:18
7:11
#8724
20K
12.43 mi11:54:241:29:027:1022:36
7:16
#8679
Half
13.11 mi11:59:101:33:487:094:46
6:59
#8585
25K
15.53 mi12:16:351:51:137:1017:25
7:11
#8353
30K
18.64 mi12:39:352:14:137:1223:00
7:24
#8022
20M
20.00 mi12:49:402:24:187:1310:05
7:25
#7865
21M
21.00 mi12:57:372:32:157:157:57
7:57
#7747
35K
21.75 mi13:02:552:37:337:155:18
7:05
#7637
23M
23.00 mi13:12:032:46:417:159:08
7:18
#7433
24M
24.00 mi13:19:102:53:487:157:07
7:07
#7285
40K
24.85 mi13:25:162:59:547:146:06
7:08
#7145
25.2M
25.20 mi13:27:533:02:317:152:37
7:35
#7062
Finish
26.22 mi13:34:443:09:227:146:51
6:43
#6872
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi8265108210828941(Top 31%)1400(Top 11%)1400(Top 26%)
10K6.21 mi3.10 mi8660-3951243-1611243-1619087(Top 32%)1406(Top 11%)1406(Top 26%)
15K9.32 mi3.11 mi8724-641281-381281-388941(Top 31%)1400(Top 11%)1400(Top 26%)
20K12.43 mi3.11 mi8679+451285-41285-48839(Top 31%)1448(Top 12%)1448(Top 26%)
Half13.11 mi0.68 mi8585+941258+271258+277558(Top 27%)927(Top 8%)927(Top 17%)
25K15.53 mi2.42 mi8353+2321187+711187+717497(Top 26%)1032(Top 8%)1032(Top 19%)
30K18.64 mi3.11 mi8022+3311121+661121+667079(Top 25%)1036(Top 8%)1036(Top 19%)
20M20.00 mi1.36 mi7865+1571090+311090+316531(Top 23%)975(Top 8%)975(Top 18%)
21M21.00 mi1.00 mi7747+1181076+141076+147095(Top 25%)1339(Top 11%)1339(Top 24%)
35K21.75 mi0.75 mi7637+1101060+161060+165940(Top 21%)908(Top 7%)908(Top 17%)
23M23.00 mi1.25 mi7433+2041035+251035+255467(Top 19%)813(Top 7%)813(Top 15%)
24M24.00 mi1.00 mi7285+1481017+181017+185330(Top 19%)831(Top 7%)831(Top 15%)
40K24.85 mi0.85 mi7145+140992+25992+254716(Top 17%)699(Top 6%)699(Top 13%)
25.2M25.20 mi0.35 mi7062+83986+6986+63908(Top 14%)542(Top 4%)542(Top 10%)
Finish26.22 mi1.02 mi6872+190947+39947+394052(Top 14%)570(Top 5%)570(Top 10%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 31%
×21stories
+97ft-345ft

Overall

8941

Females

1400

F18-39

1400

5K→10K

3.1 - 6.2 mi

Top 32%
×5stories
+79ft-138ft

Overall

9087

Females

1406

F18-39

1406

10K→15K

6.2 - 9.3 mi

Top 31%
×3stories
+67ft-78ft

Overall

8941

Females

1400

F18-39

1400

15K→20K

9.3 - 12.4 mi

Top 31%
×5stories
+106ft-86ft

Overall

8839

Females

1448

F18-39

1448

20K→Half

12.4 - 13.1 mi

Top 27%
×2stories
+19ft-37ft

Overall

7558

Females

927

F18-39

927

Half→25K

13.1 - 15.5 mi

Top 26%
×4stories
+66ft-88ft

Overall

7497

Females

1032

F18-39

1032

25K→30K

15.5 - 18.6 mi

Top 25%
×9stories
+181ft-148ft

Overall

7079

Females

1036

F18-39

1036

30K→20M

18.6 - 20.0 mi

Top 23%
×5stories
+64ft-50ft

Overall

6531

Females

975

F18-39

975

20M→21M

20.0 - 21.0 mi

Top 25%
×8stories
+106ft-24ft

Overall

7095

Females

1339

F18-39

1339

21M→35K

21.0 - 21.8 mi

Top 21%
×7stories
+17ft-86ft

Overall

5940

Females

908

F18-39

908

35K→23M

21.8 - 23.0 mi

Top 19%
×5stories
+23ft-63ft

Overall

5467

Females

813

F18-39

813

23M→24M

23.0 - 24.0 mi

Top 19%
×6stories
+12ft-82ft

Overall

5330

Females

831

F18-39

831

24M→40K

24.0 - 24.9 mi

Top 17%
×1story
+6ft-20ft

Overall

4716

Females

699

F18-39

699

40K→25.2M

24.9 - 25.2 mi

Top 14%
×1story
+13ft-16ft

Overall

3908

Females

542

F18-39

542

25.2M→Finish

25.2 - 26.2 mi

Top 14%
×2stories
+22ft-21ft

Overall

4052

Females

570

F18-39

570

Passing Analysis

Category:
Athletes Passed
2386
Passed By
993
Net Change
+1393
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8265
5K → 10K81476-395#8265#8660
10K → 15K138202-64#8660#8724
15K → 20K197152+45#8724#8679
20K → Half984+94#8679#8585
Half → 25K25624+232#8585#8353
25K → 30K37039+331#8353#8022
30K → 20M18326+157#8022#7865
20M → 21M15840+118#7865#7747
21M → 35K1166+110#7747#7637
35K → 23M2139+204#7637#7433
23M → 24M1579+148#7433#7285
24M → 40K1444+140#7285#7145
40K → 25.2M830+83#7145#7062
25.2M → Finish1922+190#7062#6872
TOTALS2386993+1393
📊

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