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BOSTON MARATHON 2025

Isabella Chao

Bib: 9810•F

MA

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 25%
Gender (Female)
#0 / 12228
Top 9%
Division (F18-39)
#0 / 5469
Top 17%
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
6:58/mi
21:40
↑ 97↓ 3451.5%
10K· 6.21 mi
6:49/mi
42:51
↑ 79↓ 1380.4%
15K· 9.32 mi
6:45/mi
1:03:49
↑ 67↓ 78
20K· 12.43 mi
6:56/mi
1:25:21
↑ 106↓ 860.1%
Half· 13.11 mi
6:59/mi
1:30:07
↑ 19↓ 370.5%
25K· 15.53 mi
7:53/mi
1:49:15
↑ 66↓ 880.2%
30K· 18.64 mi
7:39/mi
2:13:01
↑ 181↓ 1480.2%
20M
7:52/mi
2:23:42
↑ 64↓ 500.2%
21M
8:37/mi
2:32:19
↑ 106↓ 241.6%
35K· 21.75 mi
7:09/mi
2:37:40
↑ 17↓ 861.7%
23M
7:47/mi
2:47:25
↑ 23↓ 630.6%
24M
7:09/mi
2:54:34
↓ 821.3%
40K· 24.85 mi
7:23/mi
3:00:53
↓ 200.3%
25.2M
8:01/mi
3:03:39
↑ 13↓ 160.2%
Finish· 26.22 mi
6:51/mi
3:10:38
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:30:07
Pace6:52 /mi
2nd Half
Distance13.11 mi
Time1:40:31
Pace7:40 /mi
📊Positive Split: 11.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:47:3521:406:5821:40
6:58
-
10K
6.21 mi11:08:4642:516:5421:11
6:49
-0:09
15K
9.32 mi11:29:441:03:496:5120:58
6:45
-0:04
20K
12.43 mi11:51:161:25:216:5221:32
6:56
+0:11
Half
13.11 mi11:56:021:30:076:524:46
6:59
+0:03
25K
15.53 mi12:15:101:49:157:0219:08
7:53
+0:54
30K
18.64 mi12:38:562:13:017:0823:46
7:39
-0:14
20M
20.00 mi12:49:372:23:427:1110:41
7:52
+0:13
21M
21.00 mi12:58:142:32:197:158:37
8:37
+0:45
35K
21.75 mi13:03:352:37:407:155:21
7:09
-1:28
23M
23.00 mi13:13:202:47:257:179:45
7:47
+0:38
24M
24.00 mi13:20:292:54:347:167:09
7:09
-0:38
40K
24.85 mi13:26:483:00:537:176:19
7:23
+0:14
25.2M
25.20 mi13:29:343:03:397:172:46
8:01
+0:38
Finish
26.22 mi13:36:333:10:387:176:59
6:51
-1:10

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

6:45 /mi

Average Pace

7:17 /mi

Slowest Pace

8:37 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

49:08

26% of race

Time at Steady Pace

1:06:47

35% of race

Time at Slower Pace

1:14:43

39% of race

Average Pace: 7:16 /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 mi10:47:3521:406:5821:40
6:58
#7633
10K
6.21 mi11:08:4642:516:5421:11
6:49
#7136
15K
9.32 mi11:29:441:03:496:5120:58
6:45
#6656
20K
12.43 mi11:51:161:25:216:5221:32
6:56
#6568
Half
13.11 mi11:56:021:30:076:524:46
6:59
#6632
25K
15.53 mi12:15:101:49:157:0219:08
7:53
#7470
30K
18.64 mi12:38:562:13:017:0823:46
7:39
#7581
20M
20.00 mi12:49:372:23:427:1110:41
7:52
#7647
21M
21.00 mi12:58:142:32:197:158:37
8:37
#7772
35K
21.75 mi13:03:352:37:407:155:21
7:09
#7674
23M
23.00 mi13:13:202:47:257:179:45
7:47
#7663
24M
24.00 mi13:20:292:54:347:167:09
7:09
#7527
40K
24.85 mi13:26:483:00:537:176:19
7:23
#7417
25.2M
25.20 mi13:29:343:03:397:172:46
8:01
#7366
Finish
26.22 mi13:36:333:10:387:176:59
6:51
#7239
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi76338658655606(Top 20%)468(Top 4%)468(Top 9%)
10K6.21 mi3.10 mi7136+497727+138727+1386621(Top 23%)628(Top 5%)628(Top 11%)
15K9.32 mi3.11 mi6656+480632+95632+955606(Top 20%)468(Top 4%)468(Top 9%)
20K12.43 mi3.11 mi6568+88620+12620+126446(Top 23%)652(Top 5%)652(Top 12%)
Half13.11 mi0.68 mi6632-64629-9629-97569(Top 27%)938(Top 8%)938(Top 17%)
25K15.53 mi2.42 mi7470-838863-234863-23413041(Top 46%)3689(Top 30%)3689(Top 67%)
30K18.64 mi3.11 mi7581-111945-82945-828824(Top 31%)1751(Top 14%)1751(Top 32%)
20M20.00 mi1.36 mi7647-661005-601005-609461(Top 33%)2186(Top 18%)2186(Top 40%)
21M21.00 mi1.00 mi7772-1251086-811086-8111207(Top 39%)3187(Top 26%)3187(Top 58%)
35K21.75 mi0.75 mi7674+981073+131073+136336(Top 22%)1044(Top 9%)1044(Top 19%)
23M23.00 mi1.25 mi7663+111117-441117-448505(Top 30%)2036(Top 17%)2036(Top 37%)
24M24.00 mi1.00 mi7527+1361105+121105+125547(Top 20%)905(Top 7%)905(Top 17%)
40K24.85 mi0.85 mi7417+1101095+101095+106159(Top 22%)1199(Top 10%)1199(Top 22%)
25.2M25.20 mi0.35 mi7366+511087+81087+86133(Top 22%)1291(Top 11%)1291(Top 24%)
Finish26.22 mi1.02 mi7239+1271065+221065+224839(Top 17%)810(Top 7%)810(Top 15%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 20%
×21story building
+97ft-345ft

Overall

5606

Females

468

F18-39

468

5K→10K

3.1 - 6.2 mi

Top 23%
×5story building
+79ft-138ft

Overall

6621

Females

628

F18-39

628

10K→15K

6.2 - 9.3 mi

Top 20%
×3story building
+67ft-78ft

Overall

5606

Females

468

F18-39

468

15K→20K

9.3 - 12.4 mi

Top 23%
×5story building
+106ft-86ft

Overall

6446

Females

652

F18-39

652

20K→Half

12.4 - 13.1 mi

Top 27%
×2story building
+19ft-37ft

Overall

7569

Females

938

F18-39

938

Half→25K

13.1 - 15.5 mi

Top 46%
×4story building
+66ft-88ft

Overall

13041

Females

3689

F18-39

3689

25K→30K

15.5 - 18.6 mi

Top 31%
×9story building
+181ft-148ft

Overall

8824

Females

1751

F18-39

1751

30K→20M

18.6 - 20.0 mi

Top 33%
×5story building
+64ft-50ft

Overall

9461

Females

2186

F18-39

2186

20M→21M

20.0 - 21.0 mi

Top 39%
×8story building
+106ft-24ft

Overall

11207

Females

3187

F18-39

3187

21M→35K

21.0 - 21.8 mi

Top 22%
×7story building
+17ft-86ft

Overall

6336

Females

1044

F18-39

1044

35K→23M

21.8 - 23.0 mi

Top 30%
×5story building
+23ft-63ft

Overall

8505

Females

2036

F18-39

2036

23M→24M

23.0 - 24.0 mi

Top 20%
×6story building
+12ft-82ft

Overall

5547

Females

905

F18-39

905

24M→40K

24.0 - 24.9 mi

Top 22%
×1story
+6ft-20ft

Overall

6159

Females

1199

F18-39

1199

40K→25.2M

24.9 - 25.2 mi

Top 22%
×1story
+13ft-16ft

Overall

6133

Females

1291

F18-39

1291

25.2M→Finish

25.2 - 26.2 mi

Top 17%
×2story building
+22ft-21ft

Overall

4839

Females

810

F18-39

810

Passing Analysis

Category:
Athletes Passed
2188
Passed By
1794
Net Change
+394
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#7633
5K → 10K53538+497#7633#7136
10K → 15K4877+480#7136#6656
15K → 20K17991+88#6656#6568
20K → Half1074-64#6568#6632
Half → 25K16854-838#6632#7470
25K → 30K151262-111#7470#7581
30K → 20M72138-66#7581#7647
20M → 21M58183-125#7647#7772
21M → 35K1079+98#7772#7674
35K → 23M10089+11#7674#7663
23M → 24M15014+136#7663#7527
24M → 40K13121+110#7527#7417
40K → 25.2M565+51#7417#7366
25.2M → Finish1369+127#7366#7239
TOTALS21881794+394
📊

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