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BOSTON MARATHON 2024

Kimberly Chalfin

Bib: 17433•F

NY

0:00
0:00
/ mi
Masters
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Overall
#0 / 25550
Gender (Female)
#0 / 10924
Top 40%
Masters (Masters Women)
#0 / 6263
Top 29%
Division (F50-54)
#0 / 1187
Top 21%
Race Day Weather
55°/45°F
scattered clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
24:32
Rank: #13862
Start → 5K
7:54/mi
24:32 split
10K· 6.21 mi
48:52
Rank: #13353 (+509)
5K → 10K
7:50/mi
24:20 split
15K· 9.32 mi
1:13:21
Rank: #13071 (+282)
10K → 15K
7:53/mi
24:29 split
20K· 12.43 mi
1:38:25
Rank: #12786 (+285)
15K → 20K
8:04/mi
25:04 split
Half· 13.11 mi
1:43:49
Rank: #12746 (+40)
20K → Half
7:55/mi
5:24 split
25K· 15.53 mi
2:04:00
Rank: #12559 (+187)
Half → 25K
8:19/mi
20:11 split
30K· 18.64 mi
2:32:28
Rank: #12835 (-276)
25K → 30K
9:10/mi
28:28 split
20M
2:44:43
Rank: #12741 (+94)
30K → 20M
9:01/mi
12:15 split
21M
2:55:24
Rank: #12908 (-167)
20M → 21M
10:41/mi
10:41 split
35K· 21.75 mi
3:02:00
Rank: #12861 (+47)
21M → 35K
8:49/mi
6:36 split
23M
3:14:42
Rank: #13121 (-260)
35K → 23M
10:09/mi
12:42 split
24M
3:23:44
Rank: #13067 (+54)
23M → 24M
9:02/mi
9:02 split
40K· 24.85 mi
3:32:13
Rank: #13132 (-65)
24M → 40K
9:55/mi
8:29 split
25.2M
3:35:57
Rank: #13146 (-14)
40K → 25.2M
10:50/mi
3:44 split
Finish· 26.22 mi
3:45:25
Rank: #13244 (-98)
25.2M → Finish
9:17/mi
9:28 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:43:49
Pace7:55 /mi
2nd Half
Distance13.11 mi
Time2:01:36
Pace9:17 /mi
📊Positive Split: 17.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:2924:327:5424:32
7:54
-
10K
6.21 mi11:39:4948:527:5224:20
7:50
-0:04
15K
9.32 mi12:04:181:13:217:5224:29
7:53
+0:03
20K
12.43 mi12:29:221:38:257:5525:04
8:04
+0:11
Half
13.11 mi12:34:461:43:497:555:24
7:55
-0:09
25K
15.53 mi12:54:572:04:007:5920:11
8:19
+0:24
30K
18.64 mi13:23:252:32:288:1128:28
9:10
+0:51
20M
20.00 mi13:35:402:44:438:1412:15
9:01
-0:09
21M
21.00 mi13:46:212:55:248:2110:41
10:41
+1:40
35K
21.75 mi13:52:573:02:008:226:36
8:49
-1:52
23M
23.00 mi14:05:393:14:428:2812:42
10:09
+1:20
24M
24.00 mi14:14:413:23:448:299:02
9:02
-1:07
40K
24.85 mi14:23:103:32:138:328:29
9:55
+0:53
25.2M
25.20 mi14:26:543:35:578:343:44
10:50
+0:55
Finish
26.22 mi14:36:223:45:258:369:28
9:17
-1:33

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

7:50 /mi

Average Pace

8:36 /mi

Slowest Pace

10:50 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:04:00

55% of race

Time at Steady Pace

1:05:49

29% of race

Time at Slower Pace

35:36

16% of race

Average Pace: 8:36 /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 mi11:15:2924:327:5424:32
7:54
#13862
10K
6.21 mi11:39:4948:527:5224:20
7:50
#13353
15K
9.32 mi12:04:181:13:217:5224:29
7:53
#13071
20K
12.43 mi12:29:221:38:257:5525:04
8:04
#12786
Half
13.11 mi12:34:461:43:497:555:24
7:55
#12746
25K
15.53 mi12:54:572:04:007:5920:11
8:19
#12559
30K
18.64 mi13:23:252:32:288:1128:28
9:10
#12835
20M
20.00 mi13:35:402:44:438:1412:15
9:01
#12741
21M
21.00 mi13:46:212:55:248:2110:41
10:41
#12908
35K
21.75 mi13:52:573:02:008:226:36
8:49
#12861
23M
23.00 mi14:05:393:14:428:2812:42
10:09
#13121
24M
24.00 mi14:14:413:23:448:299:02
9:02
#13067
40K
24.85 mi14:23:103:32:138:328:29
9:55
#13132
25.2M
25.20 mi14:26:543:35:578:343:44
10:50
#13146
Finish
26.22 mi14:36:223:45:258:369:28
9:17
#13244
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi138624225422512546(Top 49%)3540(Top 32%)3540(Top 298%)
10K6.21 mi3.10 mi13353+5093935+2903935+29012943(Top 51%)3737(Top 34%)3737(Top 315%)
15K9.32 mi3.11 mi13071+2823799+1363799+13612546(Top 49%)3540(Top 32%)3540(Top 298%)
20K12.43 mi3.11 mi12786+2853645+1543645+15412321(Top 48%)3492(Top 32%)3492(Top 294%)
Half13.11 mi0.68 mi12746+403639+63639+612217(Top 48%)3455(Top 32%)3455(Top 291%)
25K15.53 mi2.42 mi12559+1873571+683571+6812135(Top 47%)3593(Top 33%)3593(Top 303%)
30K18.64 mi3.11 mi12835-2763808-2373808-23714022(Top 55%)4868(Top 45%)4868(Top 410%)
20M20.00 mi1.36 mi12741+943823-153823-1512213(Top 48%)4138(Top 38%)4138(Top 349%)
21M21.00 mi1.00 mi12908-1673976-1533976-15315420(Top 60%)6025(Top 55%)6025(Top 508%)
35K21.75 mi0.75 mi12861+473988-123988-1212474(Top 49%)4522(Top 41%)4522(Top 381%)
23M23.00 mi1.25 mi13121-2604207-2194207-21915934(Top 62%)6361(Top 58%)6361(Top 536%)
24M24.00 mi1.00 mi13067+544218-114218-1112353(Top 48%)4596(Top 42%)4596(Top 387%)
40K24.85 mi0.85 mi13132-654292-744292-7414733(Top 58%)5883(Top 54%)5883(Top 496%)
25.2M25.20 mi0.35 mi13146-144316-244316-2413927(Top 55%)5523(Top 51%)5523(Top 465%)
Finish26.22 mi1.02 mi13244-984399-834399-8315557(Top 61%)6278(Top 57%)6278(Top 529%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 49%
×21story building
+97ft-345ft

Overall

12546

Females

3540

F50-54

3540

5K→10K

3.1 - 6.2 mi

Top 51%
×5story building
+79ft-138ft

Overall

12943

Females

3737

F50-54

3737

10K→15K

6.2 - 9.3 mi

Top 49%
×3story building
+67ft-78ft

Overall

12546

Females

3540

F50-54

3540

15K→20K

9.3 - 12.4 mi

Top 48%
×5story building
+106ft-86ft

Overall

12321

Females

3492

F50-54

3492

20K→Half

12.4 - 13.1 mi

Top 48%
×2story building
+19ft-37ft

Overall

12217

Females

3455

F50-54

3455

Half→25K

13.1 - 15.5 mi

Top 47%
×4story building
+66ft-88ft

Overall

12135

Females

3593

F50-54

3593

25K→30K

15.5 - 18.6 mi

Top 55%
×9story building
+181ft-148ft

Overall

14022

Females

4868

F50-54

4868

30K→20M

18.6 - 20.0 mi

Top 48%
×5story building
+64ft-50ft

Overall

12213

Females

4138

F50-54

4138

20M→21M

20.0 - 21.0 mi

Top 60%
×8story building
+106ft-24ft

Overall

15420

Females

6025

F50-54

6025

21M→35K

21.0 - 21.8 mi

Top 49%
×7story building
+17ft-86ft

Overall

12474

Females

4522

F50-54

4522

35K→23M

21.8 - 23.0 mi

Top 62%
×5story building
+23ft-63ft

Overall

15934

Females

6361

F50-54

6361

23M→24M

23.0 - 24.0 mi

Top 48%
×6story building
+12ft-82ft

Overall

12353

Females

4596

F50-54

4596

24M→40K

24.0 - 24.9 mi

Top 58%
×1story
+6ft-20ft

Overall

14733

Females

5883

F50-54

5883

40K→25.2M

24.9 - 25.2 mi

Top 55%
×1story
+13ft-16ft

Overall

13927

Females

5523

F50-54

5523

25.2M→Finish

25.2 - 26.2 mi

Top 61%
×2story building
+22ft-21ft

Overall

15557

Females

6278

F50-54

6278

Passing Analysis

Category:
Athletes Passed
2691
Passed By
2073
Net Change
+618
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13862
5K → 10K620111+509#13862#13353
10K → 15K37391+282#13353#13071
15K → 20K408123+285#13071#12786
20K → Half6121+40#12786#12746
Half → 25K330143+187#12746#12559
25K → 30K194470-276#12559#12835
30K → 20M17783+94#12835#12741
20M → 21M81248-167#12741#12908
21M → 35K9548+47#12908#12861
35K → 23M73333-260#12861#13121
23M → 24M12369+54#13121#13067
24M → 40K70135-65#13067#13132
40K → 25.2M3448-14#13132#13146
25.2M → Finish52150-98#13146#13244
TOTALS26912073+618
📊

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