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BOSTON MARATHON 2025

Chihiro Nakai

Bib: 15158•F

AL

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 42%
Gender (Female)
#0 / 12228
Top 26%
Masters (Masters Women)
#0 / 6759
Top 12%
Division (F40-44)
#0 / 1718
Top 26%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
7:40/mi
23:48
↑ 97↓ 3451.5%
10K· 6.21 mi
7:32/mi
47:12
↑ 79↓ 1380.4%
15K· 9.32 mi
7:34/mi
1:10:43
↑ 67↓ 78
20K· 12.43 mi
7:52/mi
1:35:08
↑ 106↓ 860.1%
Half· 13.11 mi
7:45/mi
1:40:25
↑ 19↓ 370.5%
25K· 15.53 mi
7:58/mi
1:59:44
↑ 66↓ 880.2%
30K· 18.64 mi
8:07/mi
2:24:58
↑ 181↓ 1480.2%
20M
8:19/mi
2:36:16
↑ 64↓ 500.2%
21M
8:48/mi
2:45:04
↑ 106↓ 241.6%
35K· 21.75 mi
7:42/mi
2:50:50
↑ 17↓ 861.7%
23M
8:03/mi
3:00:55
↑ 23↓ 630.6%
24M
7:38/mi
3:08:33
↓ 821.3%
40K· 24.85 mi
7:51/mi
3:15:16
↓ 200.3%
25.2M
8:45/mi
3:18:17
↑ 13↓ 160.2%
Finish· 26.22 mi
7:28/mi
3:25:54
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:40:25
Pace7:40 /mi
2nd Half
Distance13.11 mi
Time1:45:29
Pace8:03 /mi
📊Positive Split: 5.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:58:0223:487:4023:48
7:40
-
10K
6.21 mi11:21:2647:127:3623:24
7:32
-0:08
15K
9.32 mi11:44:571:10:437:3523:31
7:34
+0:02
20K
12.43 mi12:09:221:35:087:3924:25
7:52
+0:18
Half
13.11 mi12:14:391:40:257:405:17
7:45
-0:07
25K
15.53 mi12:33:581:59:447:4219:19
7:58
+0:13
30K
18.64 mi12:59:122:24:587:4725:14
8:07
+0:09
20M
20.00 mi13:10:302:36:167:4911:18
8:19
+0:12
21M
21.00 mi13:19:182:45:047:528:48
8:48
+0:29
35K
21.75 mi13:25:042:50:507:515:46
7:42
-1:06
23M
23.00 mi13:35:093:00:557:5210:05
8:03
+0:21
24M
24.00 mi13:42:473:08:337:517:38
7:38
-0:25
40K
24.85 mi13:49:303:15:167:516:43
7:51
+0:13
25.2M
25.20 mi13:52:313:18:177:523:01
8:45
+0:54
Finish
26.22 mi14:00:083:25:547:527:37
7:28
-1:17

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

7:28 /mi

Average Pace

7:52 /mi

Slowest Pace

8:48 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:02:47

89% of race

Time at Steady Pace

23:07

11% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:51 /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 mi10:58:0223:487:4023:48
7:40
#13614
10K
6.21 mi11:21:2647:127:3623:24
7:32
#13010
15K
9.32 mi11:44:571:10:437:3523:31
7:34
#12753
20K
12.43 mi12:09:221:35:087:3924:25
7:52
#12968
Half
13.11 mi12:14:391:40:257:405:17
7:45
#13006
25K
15.53 mi12:33:581:59:447:4219:19
7:58
#13084
30K
18.64 mi12:59:122:24:587:4725:14
8:07
#12873
20M
20.00 mi13:10:302:36:167:4911:18
8:19
#12847
21M
21.00 mi13:19:182:45:047:528:48
8:48
#12789
35K
21.75 mi13:25:042:50:507:515:46
7:42
#12663
23M
23.00 mi13:35:093:00:557:5210:05
8:03
#12492
24M
24.00 mi13:42:473:08:337:517:38
7:38
#12298
40K
24.85 mi13:49:303:15:167:516:43
7:51
#12149
25.2M
25.20 mi13:52:313:18:177:523:01
8:45
#12100
Finish
26.22 mi14:00:083:25:547:527:37
7:28
#11959
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi136143662366212342(Top 43%)3084(Top 25%)3084(Top 180%)
10K6.21 mi3.10 mi13010+6043343+3193343+31912408(Top 44%)3041(Top 25%)3041(Top 177%)
15K9.32 mi3.11 mi12753+2573240+1033240+10312342(Top 43%)3084(Top 25%)3084(Top 180%)
20K12.43 mi3.11 mi12968-2153426-1863426-18613758(Top 48%)3957(Top 32%)3957(Top 230%)
Half13.11 mi0.68 mi13006-383452-263452-2613791(Top 49%)3930(Top 32%)3930(Top 229%)
25K15.53 mi2.42 mi13084-783527-753527-7513629(Top 48%)4015(Top 33%)4015(Top 234%)
30K18.64 mi3.11 mi12873+2113468+593468+5912254(Top 43%)3416(Top 28%)3416(Top 199%)
20M20.00 mi1.36 mi12847+263496-283496-2812596(Top 44%)3743(Top 31%)3743(Top 218%)
21M21.00 mi1.00 mi12789+583496349612307(Top 43%)3758(Top 31%)3758(Top 219%)
35K21.75 mi0.75 mi12663+1263452+443452+4410193(Top 36%)2711(Top 22%)2711(Top 158%)
23M23.00 mi1.25 mi12492+1713398+543398+5410446(Top 37%)2969(Top 24%)2969(Top 173%)
24M24.00 mi1.00 mi12298+1943323+753323+758704(Top 31%)2199(Top 18%)2199(Top 128%)
40K24.85 mi0.85 mi12149+1493281+423281+429222(Top 32%)2566(Top 21%)2566(Top 149%)
25.2M25.20 mi0.35 mi12100+493274+73274+710364(Top 36%)3200(Top 26%)3200(Top 186%)
Finish26.22 mi1.02 mi11959+1413230+443230+449050(Top 32%)2568(Top 21%)2568(Top 149%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 43%
×21story building
+97ft-345ft

Overall

12342

Females

3084

F40-44

3084

5K→10K

3.1 - 6.2 mi

Top 44%
×5story building
+79ft-138ft

Overall

12408

Females

3041

F40-44

3041

10K→15K

6.2 - 9.3 mi

Top 43%
×3story building
+67ft-78ft

Overall

12342

Females

3084

F40-44

3084

15K→20K

9.3 - 12.4 mi

Top 48%
×5story building
+106ft-86ft

Overall

13758

Females

3957

F40-44

3957

20K→Half

12.4 - 13.1 mi

Top 49%
×2story building
+19ft-37ft

Overall

13791

Females

3930

F40-44

3930

Half→25K

13.1 - 15.5 mi

Top 48%
×4story building
+66ft-88ft

Overall

13629

Females

4015

F40-44

4015

25K→30K

15.5 - 18.6 mi

Top 43%
×9story building
+181ft-148ft

Overall

12254

Females

3416

F40-44

3416

30K→20M

18.6 - 20.0 mi

Top 44%
×5story building
+64ft-50ft

Overall

12596

Females

3743

F40-44

3743

20M→21M

20.0 - 21.0 mi

Top 43%
×8story building
+106ft-24ft

Overall

12307

Females

3758

F40-44

3758

21M→35K

21.0 - 21.8 mi

Top 36%
×7story building
+17ft-86ft

Overall

10193

Females

2711

F40-44

2711

35K→23M

21.8 - 23.0 mi

Top 37%
×5story building
+23ft-63ft

Overall

10446

Females

2969

F40-44

2969

23M→24M

23.0 - 24.0 mi

Top 31%
×6story building
+12ft-82ft

Overall

8704

Females

2199

F40-44

2199

24M→40K

24.0 - 24.9 mi

Top 32%
×1story
+6ft-20ft

Overall

9222

Females

2566

F40-44

2566

40K→25.2M

24.9 - 25.2 mi

Top 36%
×1story
+13ft-16ft

Overall

10364

Females

3200

F40-44

3200

25.2M→Finish

25.2 - 26.2 mi

Top 32%
×2story building
+22ft-21ft

Overall

9050

Females

2568

F40-44

2568

Passing Analysis

Category:
Athletes Passed
2828
Passed By
1173
Net Change
+1655
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13614
5K → 10K67268+604#13614#13010
10K → 15K35396+257#13010#12753
15K → 20K139354-215#12753#12968
20K → Half2159-38#12968#13006
Half → 25K131209-78#13006#13084
25K → 30K333122+211#13084#12873
30K → 20M139113+26#12873#12847
20M → 21M12971+58#12847#12789
21M → 35K13711+126#12789#12663
35K → 23M20231+171#12663#12492
23M → 24M1995+194#12492#12298
24M → 40K1556+149#12298#12149
40K → 25.2M6314+49#12149#12100
25.2M → Finish15514+141#12100#11959
TOTALS28281173+1655
📊

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