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BOSTON MARATHON 2025

Callie Loo

Bib: 27296•F

TX

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
31:22
Rank: #25814
Start → 5K
31:22 | 10:06/mi
10K· 6.21 mi
1:02:10
Rank: #25454 (+360)
5K → 10K
30:48 | 9:55/mi
15K· 9.32 mi
1:32:10
Rank: #25021 (+433)
10K → 15K
30:00 | 9:39/mi
20K· 12.43 mi
2:02:51
Rank: #24725 (+296)
15K → 20K
30:41 | 9:53/mi
Half· 13.11 mi
2:09:12
Rank: #24645 (+80)
20K → Half
6:21 | 9:18/mi
25K· 15.53 mi
2:33:08
Rank: #24389 (+256)
Half → 25K
23:56 | 9:52/mi
30K· 18.64 mi
3:05:56
Rank: #24174 (+215)
25K → 30K
32:48 | 10:33/mi
20M
3:22:51
Rank: #24350 (-176)
30K → 20M
16:55 | 12:27/mi
21M
3:34:57
Rank: #24320 (+30)
20M → 21M
12:06 | 12:06/mi
35K· 21.75 mi
3:43:18
Rank: #24326 (-6)
21M → 35K
8:21 | 11:10/mi
23M
3:57:11
Rank: #24281 (+45)
35K → 23M
13:53 | 11:05/mi
24M
4:08:34
Rank: #24297 (-16)
23M → 24M
11:23 | 11:23/mi
40K· 24.85 mi
4:18:13
Rank: #24292 (+5)
24M → 40K
9:39 | 11:17/mi
25.2M
4:22:34
Rank: #24293 (-1)
40K → 25.2M
4:21 | 12:37/mi
Finish· 26.22 mi
4:32:32
Rank: #24232 (+61)
25.2M → Finish
9:58 | 9:47/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:09:12
Pace9:51 /mi
2nd Half
Distance13.11 mi
Time2:23:20
Pace10:56 /mi
📊Positive Split: 10.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:52:3231:2210:0631:22
10:06
-
10K
6.21 mi12:23:201:02:1010:0030:48
9:55
-0:11
15K
9.32 mi12:53:201:32:109:5330:00
9:39
-0:16
20K
12.43 mi13:24:012:02:519:5330:41
9:53
+0:14
Half
13.11 mi13:30:222:09:129:516:21
9:18
-0:35
25K
15.53 mi13:54:182:33:089:5123:56
9:52
+0:34
30K
18.64 mi14:27:063:05:569:5832:48
10:33
+0:41
20M
20.00 mi14:44:013:22:5110:0916:55
12:27
+1:54
21M
21.00 mi14:56:073:34:5710:1412:06
12:06
-0:21
35K
21.75 mi15:04:283:43:1810:168:21
11:10
-0:56
23M
23.00 mi15:18:213:57:1110:1913:53
11:05
-0:05
24M
24.00 mi15:29:444:08:3410:2111:23
11:23
+0:18
40K
24.85 mi15:39:234:18:1310:239:39
11:17
-0:06
25.2M
25.20 mi15:43:444:22:3410:254:21
12:37
+1:20
Finish
26.22 mi15:53:424:32:3210:249:58
9:47
-2:50

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

9:18 /mi

Average Pace

10:24 /mi

Slowest Pace

12:37 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:11:44

48% of race

Time at Steady Pace

1:04:10

24% of race

Time at Slower Pace

1:16:38

28% of race

Average Pace: 10:24 /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 mi11:52:3231:2210:0631:22
10:06
#25814
10K
6.21 mi12:23:201:02:1010:0030:48
9:55
#25454
15K
9.32 mi12:53:201:32:109:5330:00
9:39
#25021
20K
12.43 mi13:24:012:02:519:5330:41
9:53
#24725
Half
13.11 mi13:30:222:09:129:516:21
9:18
#24645
25K
15.53 mi13:54:182:33:089:5123:56
9:52
#24389
30K
18.64 mi14:27:063:05:569:5832:48
10:33
#24174
20M
20.00 mi14:44:013:22:5110:0916:55
12:27
#24350
21M
21.00 mi14:56:073:34:5710:1412:06
12:06
#24320
35K
21.75 mi15:04:283:43:1810:168:21
11:10
#24326
23M
23.00 mi15:18:213:57:1110:1913:53
11:05
#24281
24M
24.00 mi15:29:444:08:3410:2111:23
11:23
#24297
40K
24.85 mi15:39:234:18:1310:239:39
11:17
#24292
25.2M
25.20 mi15:43:444:22:3410:254:21
12:37
#24293
Finish
26.22 mi15:53:424:32:3210:249:58
9:47
#24232
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi25814106491064924164(Top 85%)9763(Top 80%)9763(Top 179%)
10K6.21 mi3.10 mi25454+36010476+17310476+17325130(Top 88%)10305(Top 84%)10305(Top 188%)
15K9.32 mi3.11 mi25021+43310235+24110235+24124164(Top 85%)9763(Top 80%)9763(Top 179%)
20K12.43 mi3.11 mi24725+29610085+15010085+15023961(Top 84%)9683(Top 79%)9683(Top 177%)
Half13.11 mi0.68 mi24645+8010043+4210043+4223029(Top 81%)9173(Top 75%)9173(Top 168%)
25K15.53 mi2.42 mi24389+2569924+1199924+11922954(Top 81%)9169(Top 75%)9169(Top 168%)
30K18.64 mi3.11 mi24174+2159822+1029822+10223067(Top 81%)9358(Top 77%)9358(Top 171%)
20M20.00 mi1.36 mi24350-1769937-1159937-11525854(Top 91%)10930(Top 89%)10930(Top 200%)
21M21.00 mi1.00 mi24320+309942-59942-523779(Top 84%)9906(Top 81%)9906(Top 181%)
35K21.75 mi0.75 mi24326-69949-79949-724550(Top 86%)10359(Top 85%)10359(Top 189%)
23M23.00 mi1.25 mi24281+459941+89941+823441(Top 83%)9823(Top 80%)9823(Top 180%)
24M24.00 mi1.00 mi24297-169955-149955-1424708(Top 87%)10494(Top 86%)10494(Top 192%)
40K24.85 mi0.85 mi24292+59969-149969-1423749(Top 84%)10056(Top 82%)10056(Top 184%)
25.2M25.20 mi0.35 mi24293-19973-49973-424438(Top 86%)10396(Top 85%)10396(Top 190%)
Finish26.22 mi1.02 mi24232+619958+159958+1522233(Top 78%)9288(Top 76%)9288(Top 170%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 85%
×21stories
+97ft-345ft

Overall

24164

Females

9763

F18-39

9763

5K→10K

3.1 - 6.2 mi

Top 88%
×5stories
+79ft-138ft

Overall

25130

Females

10305

F18-39

10305

10K→15K

6.2 - 9.3 mi

Top 85%
×3stories
+67ft-78ft

Overall

24164

Females

9763

F18-39

9763

15K→20K

9.3 - 12.4 mi

Top 84%
×5stories
+106ft-86ft

Overall

23961

Females

9683

F18-39

9683

20K→Half

12.4 - 13.1 mi

Top 81%
×2stories
+19ft-37ft

Overall

23029

Females

9173

F18-39

9173

Half→25K

13.1 - 15.5 mi

Top 81%
×4stories
+66ft-88ft

Overall

22954

Females

9169

F18-39

9169

25K→30K

15.5 - 18.6 mi

Top 81%
×9stories
+181ft-148ft

Overall

23067

Females

9358

F18-39

9358

30K→20M

18.6 - 20.0 mi

Top 91%
×5stories
+64ft-50ft

Overall

25854

Females

10930

F18-39

10930

20M→21M

20.0 - 21.0 mi

Top 84%
×8stories
+106ft-24ft

Overall

23779

Females

9906

F18-39

9906

21M→35K

21.0 - 21.8 mi

Top 86%
×7stories
+17ft-86ft

Overall

24550

Females

10359

F18-39

10359

35K→23M

21.8 - 23.0 mi

Top 83%
×5stories
+23ft-63ft

Overall

23441

Females

9823

F18-39

9823

23M→24M

23.0 - 24.0 mi

Top 87%
×6stories
+12ft-82ft

Overall

24708

Females

10494

F18-39

10494

24M→40K

24.0 - 24.9 mi

Top 84%
×1story
+6ft-20ft

Overall

23749

Females

10056

F18-39

10056

40K→25.2M

24.9 - 25.2 mi

Top 86%
×1story
+13ft-16ft

Overall

24438

Females

10396

F18-39

10396

25.2M→Finish

25.2 - 26.2 mi

Top 78%
×2stories
+22ft-21ft

Overall

22233

Females

9288

F18-39

9288

Passing Analysis

Category:
Athletes Passed
2187
Passed By
605
Net Change
+1582
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#25814
5K → 10K41555+360#25814#25454
10K → 15K44411+433#25454#25021
15K → 20K32226+296#25021#24725
20K → Half833+80#24725#24645
Half → 25K2615+256#24645#24389
25K → 30K27156+215#24389#24174
30K → 20M30206-176#24174#24350
20M → 21M8151+30#24350#24320
21M → 35K3440-6#24320#24326
35K → 23M7934+45#24326#24281
23M → 24M3955-16#24281#24297
24M → 40K4237+5#24297#24292
40K → 25.2M1415-1#24292#24293
25.2M → Finish7211+61#24293#24232
TOTALS2187605+1582
📊

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