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BOSTON MARATHON 2025

Fern Calkins

Bib: 28025•F

ME

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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
28:53
Rank: #23547
Start → 5K
28:53 | 9:18/mi
10K· 6.21 mi
58:27
Rank: #23912 (-365)
5K → 10K
29:34 | 9:31/mi
15K· 9.32 mi
1:28:24
Rank: #23993 (-81)
10K → 15K
29:57 | 9:38/mi
20K· 12.43 mi
1:59:00
Rank: #23939 (+54)
15K → 20K
30:36 | 9:51/mi
Half· 13.11 mi
2:05:33
Rank: #23930 (+9)
20K → Half
6:33 | 9:36/mi
25K· 15.53 mi
2:29:53
Rank: #23840 (+90)
Half → 25K
24:20 | 10:02/mi
30K· 18.64 mi
3:02:25
Rank: #23630 (+210)
25K → 30K
32:32 | 10:28/mi
20M
3:17:04
Rank: #23590 (+40)
30K → 20M
14:39 | 10:47/mi
21M
3:28:41
Rank: #23548 (+42)
20M → 21M
11:37 | 11:37/mi
35K· 21.75 mi
3:36:35
Rank: #23538 (+10)
21M → 35K
7:54 | 10:34/mi
23M
3:51:36
Rank: #23663 (-125)
35K → 23M
15:01 | 12:00/mi
24M
4:02:57
Rank: #23728 (-65)
23M → 24M
11:21 | 11:21/mi
40K· 24.85 mi
4:12:40
Rank: #23730 (-2)
24M → 40K
9:43 | 11:22/mi
25.2M
4:16:54
Rank: #23739 (-9)
40K → 25.2M
4:14 | 12:17/mi
Finish· 26.22 mi
4:27:09
Rank: #23715 (+24)
25.2M → Finish
10:15 | 10:04/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:05:33
Pace9:35 /mi
2nd Half
Distance13.11 mi
Time2:21:36
Pace10:48 /mi
📊Positive Split: 12.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:47:1228:539:1828:53
9:18
-
10K
6.21 mi12:16:4658:279:2429:34
9:31
+0:13
15K
9.32 mi12:46:431:28:249:2929:57
9:38
+0:07
20K
12.43 mi13:17:191:59:009:3530:36
9:51
+0:13
Half
13.11 mi13:23:522:05:339:356:33
9:36
-0:15
25K
15.53 mi13:48:122:29:539:3924:20
10:02
+0:26
30K
18.64 mi14:20:443:02:259:4732:32
10:28
+0:26
20M
20.00 mi14:35:233:17:049:5114:39
10:47
+0:19
21M
21.00 mi14:47:003:28:419:5611:37
11:37
+0:50
35K
21.75 mi14:54:543:36:359:587:54
10:34
-1:03
23M
23.00 mi15:09:553:51:3610:0415:01
12:00
+1:26
24M
24.00 mi15:21:164:02:5710:0711:21
11:21
-0:39
40K
24.85 mi15:30:594:12:4010:109:43
11:22
+0:01
25.2M
25.20 mi15:35:134:16:5410:124:14
12:17
+0:55
Finish
26.22 mi15:45:284:27:0910:1210:15
10:04
-2:13

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

10:12 /mi

Slowest Pace

12:17 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:05:33

47% of race

Time at Steady Pace

1:29:40

34% of race

Time at Slower Pace

51:56

19% of race

Average Pace: 10:11 /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 mi11:47:1228:539:1828:53
9:18
#23547
10K
6.21 mi12:16:4658:279:2429:34
9:31
#23912
15K
9.32 mi12:46:431:28:249:2929:57
9:38
#23993
20K
12.43 mi13:17:191:59:009:3530:36
9:51
#23939
Half
13.11 mi13:23:522:05:339:356:33
9:36
#23930
25K
15.53 mi13:48:122:29:539:3924:20
10:02
#23840
30K
18.64 mi14:20:443:02:259:4732:32
10:28
#23630
20M
20.00 mi14:35:233:17:049:5114:39
10:47
#23590
21M
21.00 mi14:47:003:28:419:5611:37
11:37
#23548
35K
21.75 mi14:54:543:36:359:587:54
10:34
#23538
23M
23.00 mi15:09:553:51:3610:0415:01
12:00
#23663
24M
24.00 mi15:21:164:02:5710:0711:21
11:21
#23728
40K
24.85 mi15:30:594:12:4010:109:43
11:22
#23730
25.2M
25.20 mi15:35:134:16:5410:124:14
12:17
#23739
Finish
26.22 mi15:45:284:27:0910:1210:15
10:04
#23715
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi235479459945924128(Top 85%)9745(Top 80%)9745(Top 178%)
10K6.21 mi3.10 mi23912-3659639-1809639-18024164(Top 85%)9780(Top 80%)9780(Top 179%)
15K9.32 mi3.11 mi23993-819671-329671-3224128(Top 85%)9745(Top 80%)9745(Top 178%)
20K12.43 mi3.11 mi23939+549659+129659+1223886(Top 84%)9643(Top 79%)9643(Top 176%)
Half13.11 mi0.68 mi23930+99655+49655+423870(Top 84%)9631(Top 79%)9631(Top 176%)
25K15.53 mi2.42 mi23840+909608+479608+4723360(Top 82%)9400(Top 77%)9400(Top 172%)
30K18.64 mi3.11 mi23630+2109529+799529+7922898(Top 81%)9263(Top 76%)9263(Top 169%)
20M20.00 mi1.36 mi23590+409533-49533-423149(Top 81%)9496(Top 78%)9496(Top 174%)
21M21.00 mi1.00 mi23548+429525+89525+822867(Top 81%)9437(Top 77%)9437(Top 173%)
35K21.75 mi0.75 mi23538+109531-69531-623303(Top 82%)9706(Top 79%)9706(Top 177%)
23M23.00 mi1.25 mi23663-1259612-819612-8125112(Top 88%)10660(Top 87%)10660(Top 195%)
24M24.00 mi1.00 mi23728-659665-539665-5324660(Top 87%)10466(Top 86%)10466(Top 191%)
40K24.85 mi0.85 mi23730-29684-199684-1923899(Top 84%)10118(Top 83%)10118(Top 185%)
25.2M25.20 mi0.35 mi23739-99692-89692-823790(Top 84%)10064(Top 82%)10064(Top 184%)
Finish26.22 mi1.02 mi23715+249689+39689+323119(Top 81%)9726(Top 80%)9726(Top 178%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 85%
×21stories
+97ft-345ft

Overall

24128

Females

9745

F18-39

9745

5K→10K

3.1 - 6.2 mi

Top 85%
×5stories
+79ft-138ft

Overall

24164

Females

9780

F18-39

9780

10K→15K

6.2 - 9.3 mi

Top 85%
×3stories
+67ft-78ft

Overall

24128

Females

9745

F18-39

9745

15K→20K

9.3 - 12.4 mi

Top 84%
×5stories
+106ft-86ft

Overall

23886

Females

9643

F18-39

9643

20K→Half

12.4 - 13.1 mi

Top 84%
×2stories
+19ft-37ft

Overall

23870

Females

9631

F18-39

9631

Half→25K

13.1 - 15.5 mi

Top 82%
×4stories
+66ft-88ft

Overall

23360

Females

9400

F18-39

9400

25K→30K

15.5 - 18.6 mi

Top 81%
×9stories
+181ft-148ft

Overall

22898

Females

9263

F18-39

9263

30K→20M

18.6 - 20.0 mi

Top 81%
×5stories
+64ft-50ft

Overall

23149

Females

9496

F18-39

9496

20M→21M

20.0 - 21.0 mi

Top 81%
×8stories
+106ft-24ft

Overall

22867

Females

9437

F18-39

9437

21M→35K

21.0 - 21.8 mi

Top 82%
×7stories
+17ft-86ft

Overall

23303

Females

9706

F18-39

9706

35K→23M

21.8 - 23.0 mi

Top 88%
×5stories
+23ft-63ft

Overall

25112

Females

10660

F18-39

10660

23M→24M

23.0 - 24.0 mi

Top 87%
×6stories
+12ft-82ft

Overall

24660

Females

10466

F18-39

10466

24M→40K

24.0 - 24.9 mi

Top 84%
×1story
+6ft-20ft

Overall

23899

Females

10118

F18-39

10118

40K→25.2M

24.9 - 25.2 mi

Top 84%
×1story
+13ft-16ft

Overall

23790

Females

10064

F18-39

10064

25.2M→Finish

25.2 - 26.2 mi

Top 81%
×2stories
+22ft-21ft

Overall

23119

Females

9726

F18-39

9726

Passing Analysis

Category:
Athletes Passed
1241
Passed By
1409
Net Change
-168
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23547
5K → 10K117482-365#23547#23912
10K → 15K118199-81#23912#23993
15K → 20K165111+54#23993#23939
20K → Half2415+9#23939#23930
Half → 25K15969+90#23930#23840
25K → 30K26454+210#23840#23630
30K → 20M9959+40#23630#23590
20M → 21M9250+42#23590#23548
21M → 35K4737+10#23548#23538
35K → 23M35160-125#23538#23663
23M → 24M2792-65#23663#23728
24M → 40K3941-2#23728#23730
40K → 25.2M817-9#23730#23739
25.2M → Finish4723+24#23739#23715
TOTALS12411409-168
📊

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