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BOSTON MARATHON 2025

Clara Kiefel-Johnson

Bib: 11671•F

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 35%
Gender (Female)
#0 / 12228
Top 18%
Division (F18-39)
#0 / 5469
Top 32%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:46
Rank: #10661
Start → 5K
22:46 | 7:20/mi
10K· 6.21 mi
45:23
Rank: #10378 (+283)
5K → 10K
22:37 | 7:17/mi
15K· 9.32 mi
1:08:00
Rank: #10176 (+202)
10K → 15K
22:37 | 7:17/mi
20K· 12.43 mi
1:31:17
Rank: #10269 (-93)
15K → 20K
23:17 | 7:30/mi
Half· 13.11 mi
1:36:22
Rank: #10308 (-39)
20K → Half
5:05 | 7:27/mi
25K· 15.53 mi
1:54:57
Rank: #10454 (-146)
Half → 25K
18:35 | 7:40/mi
30K· 18.64 mi
2:20:04
Rank: #10707 (-253)
25K → 30K
25:07 | 8:05/mi
20M
2:31:05
Rank: #10729 (-22)
30K → 20M
11:01 | 8:06/mi
21M
2:39:36
Rank: #10677 (+52)
20M → 21M
8:31 | 8:31/mi
35K· 21.75 mi
2:45:29
Rank: #10681 (-4)
21M → 35K
5:53 | 7:52/mi
23M
2:55:18
Rank: #10524 (+157)
35K → 23M
9:49 | 7:50/mi
24M
3:02:52
Rank: #10397 (+127)
23M → 24M
7:34 | 7:34/mi
40K· 24.85 mi
3:09:15
Rank: #10190 (+207)
24M → 40K
6:23 | 7:28/mi
25.2M
3:12:08
Rank: #10140 (+50)
40K → 25.2M
2:53 | 8:22/mi
Finish· 26.22 mi
3:19:46
Rank: #10073 (+67)
25.2M → Finish
7:38 | 7:29/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:36:22
Pace7:21 /mi
2nd Half
Distance13.11 mi
Time1:43:24
Pace7:53 /mi
📊Positive Split: 7.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:5522:467:2022:46
7:20
-
10K
6.21 mi11:14:3245:237:1822:37
7:17
-0:03
15K
9.32 mi11:37:091:08:007:1822:37
7:17
0:00
20K
12.43 mi12:00:261:31:177:2123:17
7:30
+0:13
Half
13.11 mi12:05:311:36:227:215:05
7:27
-0:03
25K
15.53 mi12:24:061:54:577:2418:35
7:40
+0:13
30K
18.64 mi12:49:132:20:047:3125:07
8:05
+0:25
20M
20.00 mi13:00:142:31:057:3311:01
8:06
+0:01
21M
21.00 mi13:08:452:39:367:368:31
8:31
+0:25
35K
21.75 mi13:14:382:45:297:375:53
7:52
-0:39
23M
23.00 mi13:24:272:55:187:379:49
7:50
-0:02
24M
24.00 mi13:32:013:02:527:377:34
7:34
-0:16
40K
24.85 mi13:38:243:09:157:376:23
7:28
-0:06
25.2M
25.20 mi13:41:173:12:087:372:53
8:22
+0:54
Finish
26.22 mi13:48:553:19:467:377:38
7:29
-0:53

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

7:17 /mi

Average Pace

7:37 /mi

Slowest Pace

8:31 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:32:14

76% of race

Time at Steady Pace

47:32

24% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:37 /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 mi10:51:5522:467:2022:46
7:20
#10661
10K
6.21 mi11:14:3245:237:1822:37
7:17
#10378
15K
9.32 mi11:37:091:08:007:1822:37
7:17
#10176
20K
12.43 mi12:00:261:31:177:2123:17
7:30
#10269
Half
13.11 mi12:05:311:36:227:215:05
7:27
#10308
25K
15.53 mi12:24:061:54:577:2418:35
7:40
#10454
30K
18.64 mi12:49:132:20:047:3125:07
8:05
#10707
20M
20.00 mi13:00:142:31:057:3311:01
8:06
#10729
21M
21.00 mi13:08:452:39:367:368:31
8:31
#10677
35K
21.75 mi13:14:382:45:297:375:53
7:52
#10681
23M
23.00 mi13:24:272:55:187:379:49
7:50
#10524
24M
24.00 mi13:32:013:02:527:377:34
7:34
#10397
40K
24.85 mi13:38:243:09:157:376:23
7:28
#10190
25.2M
25.20 mi13:41:173:12:087:372:53
8:22
#10140
Finish
26.22 mi13:48:553:19:467:377:38
7:29
#10073
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi10661211821189846(Top 35%)1823(Top 15%)1823(Top 33%)
10K6.21 mi3.10 mi10378+2831994+1241994+12410201(Top 36%)1913(Top 16%)1913(Top 35%)
15K9.32 mi3.11 mi10176+2021923+711923+719846(Top 35%)1823(Top 15%)1823(Top 33%)
20K12.43 mi3.11 mi10269-931996-731996-7310728(Top 38%)2331(Top 19%)2331(Top 43%)
Half13.11 mi0.68 mi10308-392022-262022-2611354(Top 40%)2599(Top 21%)2599(Top 48%)
25K15.53 mi2.42 mi10454-1462110-882110-8811273(Top 40%)2722(Top 22%)2722(Top 50%)
30K18.64 mi3.11 mi10707-2532312-2022312-20211986(Top 42%)3282(Top 27%)3282(Top 60%)
20M20.00 mi1.36 mi10729-222373-612373-6111170(Top 39%)3018(Top 25%)3018(Top 55%)
21M21.00 mi1.00 mi10677+522382-92382-910590(Top 37%)2893(Top 24%)2893(Top 53%)
35K21.75 mi0.75 mi10681-42399-172399-1711304(Top 40%)3256(Top 27%)3256(Top 60%)
23M23.00 mi1.25 mi10524+1572361+382361+388896(Top 31%)2206(Top 18%)2206(Top 40%)
24M24.00 mi1.00 mi10397+1272332+292332+298202(Top 29%)1956(Top 16%)1956(Top 36%)
40K24.85 mi0.85 mi10190+2072276+562276+566651(Top 23%)1416(Top 12%)1416(Top 26%)
25.2M25.20 mi0.35 mi10140+502264+122264+128033(Top 28%)2091(Top 17%)2091(Top 38%)
Finish26.22 mi1.02 mi10073+672255+92255+99135(Top 32%)2592(Top 21%)2592(Top 47%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 35%
×21stories
+97ft-345ft

Overall

9846

Females

1823

F18-39

1823

5K→10K

3.1 - 6.2 mi

Top 36%
×5stories
+79ft-138ft

Overall

10201

Females

1913

F18-39

1913

10K→15K

6.2 - 9.3 mi

Top 35%
×3stories
+67ft-78ft

Overall

9846

Females

1823

F18-39

1823

15K→20K

9.3 - 12.4 mi

Top 38%
×5stories
+106ft-86ft

Overall

10728

Females

2331

F18-39

2331

20K→Half

12.4 - 13.1 mi

Top 40%
×2stories
+19ft-37ft

Overall

11354

Females

2599

F18-39

2599

Half→25K

13.1 - 15.5 mi

Top 40%
×4stories
+66ft-88ft

Overall

11273

Females

2722

F18-39

2722

25K→30K

15.5 - 18.6 mi

Top 42%
×9stories
+181ft-148ft

Overall

11986

Females

3282

F18-39

3282

30K→20M

18.6 - 20.0 mi

Top 39%
×5stories
+64ft-50ft

Overall

11170

Females

3018

F18-39

3018

20M→21M

20.0 - 21.0 mi

Top 37%
×8stories
+106ft-24ft

Overall

10590

Females

2893

F18-39

2893

21M→35K

21.0 - 21.8 mi

Top 40%
×7stories
+17ft-86ft

Overall

11304

Females

3256

F18-39

3256

35K→23M

21.8 - 23.0 mi

Top 31%
×5stories
+23ft-63ft

Overall

8896

Females

2206

F18-39

2206

23M→24M

23.0 - 24.0 mi

Top 29%
×6stories
+12ft-82ft

Overall

8202

Females

1956

F18-39

1956

24M→40K

24.0 - 24.9 mi

Top 23%
×1story
+6ft-20ft

Overall

6651

Females

1416

F18-39

1416

40K→25.2M

24.9 - 25.2 mi

Top 28%
×1story
+13ft-16ft

Overall

8033

Females

2091

F18-39

2091

25.2M→Finish

25.2 - 26.2 mi

Top 32%
×2stories
+22ft-21ft

Overall

9135

Females

2592

F18-39

2592

Passing Analysis

Category:
Athletes Passed
2143
Passed By
1553
Net Change
+588
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10661
5K → 10K410127+283#10661#10378
10K → 15K28280+202#10378#10176
15K → 20K145237-93#10176#10269
20K → Half2665-39#10269#10308
Half → 25K117263-146#10308#10454
25K → 30K162414-253#10454#10707
30K → 20M106128-22#10707#10729
20M → 21M12371+52#10729#10677
21M → 35K5155-4#10677#10681
35K → 23M18730+157#10681#10524
23M → 24M15225+127#10524#10397
24M → 40K2114+207#10397#10190
40K → 25.2M577+50#10190#10140
25.2M → Finish11447+67#10140#10073
TOTALS21431553+588
📊

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