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BOSTON MARATHON 2024

Chihiro Nakai

Bib: 14747•F

AL

0:00
0:00
/ mi
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Overall
#0 / 25550
Top 25%
Gender (Female)
#0 / 10924
Top 10%
Division (F18-39)
#0 / 4660
Top 19%
Race Day Weather
55°/45°F
scattered clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:07
Rank: #10274
Start → 5K
23:07 | 7:26/mi
10K· 6.21 mi
45:36
Rank: #9188 (+1086)
5K → 10K
22:29 | 7:14/mi
15K· 9.32 mi
1:08:11
Rank: #8731 (+457)
10K → 15K
22:35 | 7:16/mi
20K· 12.43 mi
1:31:15
Rank: #8436 (+295)
15K → 20K
23:04 | 7:25/mi
Half· 13.11 mi
1:36:12
Rank: #8374 (+62)
20K → Half
4:57 | 7:15/mi
25K· 15.53 mi
1:54:17
Rank: #8024 (+350)
Half → 25K
18:05 | 7:27/mi
30K· 18.64 mi
2:18:23
Rank: #7610 (+414)
25K → 30K
24:06 | 7:45/mi
20M
2:29:20
Rank: #7486 (+124)
30K → 20M
10:57 | 8:03/mi
21M
2:38:00
Rank: #7395 (+91)
20M → 21M
8:40 | 8:40/mi
35K· 21.75 mi
2:43:52
Rank: #7316 (+79)
21M → 35K
5:52 | 7:51/mi
23M
2:53:47
Rank: #7090 (+226)
35K → 23M
9:55 | 7:55/mi
24M
3:01:23
Rank: #6883 (+207)
23M → 24M
7:36 | 7:36/mi
40K· 24.85 mi
3:07:54
Rank: #6663 (+220)
24M → 40K
6:31 | 7:37/mi
25.2M
3:10:53
Rank: #6608 (+55)
40K → 25.2M
2:59 | 8:39/mi
Finish· 26.22 mi
3:18:27
Rank: #6509 (+99)
25.2M → Finish
7:34 | 7:26/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:36:12
Pace7:20 /mi
2nd Half
Distance13.11 mi
Time1:42:15
Pace7:48 /mi
📊Positive Split: 6.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:55:0023:077:2623:07
7:26
-
10K
6.21 mi11:17:2945:367:2022:29
7:14
-0:12
15K
9.32 mi11:40:041:08:117:1922:35
7:16
+0:02
20K
12.43 mi12:03:081:31:157:2123:04
7:25
+0:09
Half
13.11 mi12:08:051:36:127:204:57
7:15
-0:10
25K
15.53 mi12:26:101:54:177:2118:05
7:27
+0:12
30K
18.64 mi12:50:162:18:237:2524:06
7:45
+0:18
20M
20.00 mi13:01:132:29:207:2810:57
8:03
+0:18
21M
21.00 mi13:09:532:38:007:318:40
8:40
+0:37
35K
21.75 mi13:15:452:43:527:325:52
7:51
-0:49
23M
23.00 mi13:25:402:53:477:339:55
7:55
+0:04
24M
24.00 mi13:33:163:01:237:337:36
7:36
-0:19
40K
24.85 mi13:39:473:07:547:346:31
7:37
+0:01
25.2M
25.20 mi13:42:463:10:537:342:59
8:39
+1:02
Finish
26.22 mi13:50:203:18:277:347:34
7:26
-1:13

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

7:14 /mi

Average Pace

7:34 /mi

Slowest Pace

8:40 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:55:51

89% of race

Time at Steady Pace

10:57

6% of race

Time at Slower Pace

11:39

6% of race

Average Pace: 7:34 /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 mi10:55:0023:077:2623:07
7:26
#10274
10K
6.21 mi11:17:2945:367:2022:29
7:14
#9188
15K
9.32 mi11:40:041:08:117:1922:35
7:16
#8731
20K
12.43 mi12:03:081:31:157:2123:04
7:25
#8436
Half
13.11 mi12:08:051:36:127:204:57
7:15
#8374
25K
15.53 mi12:26:101:54:177:2118:05
7:27
#8024
30K
18.64 mi12:50:162:18:237:2524:06
7:45
#7610
20M
20.00 mi13:01:132:29:207:2810:57
8:03
#7486
21M
21.00 mi13:09:532:38:007:318:40
8:40
#7395
35K
21.75 mi13:15:452:43:527:325:52
7:51
#7316
23M
23.00 mi13:25:402:53:477:339:55
7:55
#7090
24M
24.00 mi13:33:163:01:237:337:36
7:36
#6883
40K
24.85 mi13:39:473:07:547:346:31
7:37
#6663
25.2M
25.20 mi13:42:463:10:537:342:59
8:39
#6608
Finish
26.22 mi13:50:203:18:277:347:34
7:26
#6509
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi10274215121517960(Top 31%)1246(Top 11%)1246(Top 27%)
10K6.21 mi3.10 mi9188+10861693+4581693+4588196(Top 32%)1318(Top 12%)1318(Top 28%)
15K9.32 mi3.11 mi8731+4571524+1691524+1697960(Top 31%)1246(Top 11%)1246(Top 27%)
20K12.43 mi3.11 mi8436+2951425+991425+997824(Top 31%)1311(Top 12%)1311(Top 28%)
Half13.11 mi0.68 mi8374+621402+231402+237399(Top 29%)1134(Top 10%)1134(Top 24%)
25K15.53 mi2.42 mi8024+3501296+1061296+1066746(Top 26%)1069(Top 10%)1069(Top 23%)
30K18.64 mi3.11 mi7610+4141219+771219+776456(Top 25%)1136(Top 10%)1136(Top 24%)
20M20.00 mi1.36 mi7486+1241215+41215+47108(Top 28%)1583(Top 14%)1583(Top 34%)
21M21.00 mi1.00 mi7395+911225-101225-107001(Top 27%)1712(Top 16%)1712(Top 37%)
35K21.75 mi0.75 mi7316+791226-11226-16844(Top 27%)1668(Top 15%)1668(Top 36%)
23M23.00 mi1.25 mi7090+2261193+331193+335373(Top 21%)1165(Top 11%)1165(Top 25%)
24M24.00 mi1.00 mi6883+2071156+371156+374565(Top 18%)914(Top 8%)914(Top 20%)
40K24.85 mi0.85 mi6663+2201125+311125+314013(Top 16%)790(Top 7%)790(Top 17%)
25.2M25.20 mi0.35 mi6608+551124+11124+15097(Top 20%)1298(Top 12%)1298(Top 28%)
Finish26.22 mi1.02 mi6509+991114+101114+105221(Top 20%)1281(Top 12%)1281(Top 27%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 31%
×21stories
+97ft-345ft

Overall

7960

Females

1246

F18-39

1246

5K→10K

3.1 - 6.2 mi

Top 32%
×5stories
+79ft-138ft

Overall

8196

Females

1318

F18-39

1318

10K→15K

6.2 - 9.3 mi

Top 31%
×3stories
+67ft-78ft

Overall

7960

Females

1246

F18-39

1246

15K→20K

9.3 - 12.4 mi

Top 31%
×5stories
+106ft-86ft

Overall

7824

Females

1311

F18-39

1311

20K→Half

12.4 - 13.1 mi

Top 29%
×2stories
+19ft-37ft

Overall

7399

Females

1134

F18-39

1134

Half→25K

13.1 - 15.5 mi

Top 26%
×4stories
+66ft-88ft

Overall

6746

Females

1069

F18-39

1069

25K→30K

15.5 - 18.6 mi

Top 25%
×9stories
+181ft-148ft

Overall

6456

Females

1136

F18-39

1136

30K→20M

18.6 - 20.0 mi

Top 28%
×5stories
+64ft-50ft

Overall

7108

Females

1583

F18-39

1583

20M→21M

20.0 - 21.0 mi

Top 27%
×8stories
+106ft-24ft

Overall

7001

Females

1712

F18-39

1712

21M→35K

21.0 - 21.8 mi

Top 27%
×7stories
+17ft-86ft

Overall

6844

Females

1668

F18-39

1668

35K→23M

21.8 - 23.0 mi

Top 21%
×5stories
+23ft-63ft

Overall

5373

Females

1165

F18-39

1165

23M→24M

23.0 - 24.0 mi

Top 18%
×6stories
+12ft-82ft

Overall

4565

Females

914

F18-39

914

24M→40K

24.0 - 24.9 mi

Top 16%
×1story
+6ft-20ft

Overall

4013

Females

790

F18-39

790

40K→25.2M

24.9 - 25.2 mi

Top 20%
×1story
+13ft-16ft

Overall

5097

Females

1298

F18-39

1298

25.2M→Finish

25.2 - 26.2 mi

Top 20%
×2stories
+22ft-21ft

Overall

5221

Females

1281

F18-39

1281

Passing Analysis

Category:
Athletes Passed
4183*
Passed By
418
Net Change
+3765
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10274
5K → 10K1098*12+1086#10274#9188
10K → 15K47316+457#9188#8731
15K → 20K35863+295#8731#8436
20K → Half7412+62#8436#8374
Half → 25K37828+350#8374#8024
25K → 30K46551+414#8024#7610
30K → 20M18359+124#7610#7486
20M → 21M15968+91#7486#7395
21M → 35K11536+79#7395#7316
35K → 23M25125+226#7316#7090
23M → 24M2158+207#7090#6883
24M → 40K2266+220#6883#6663
40K → 25.2M7217+55#6663#6608
25.2M → Finish11617+99#6608#6509
TOTALS4183*418+3765

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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