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BOSTON MARATHON 2025

Sachiko Inamoto

Bib: 21431•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 38%
Masters (Masters Women)
#0 / 6759
Top 23%
Division (F45-49)
#0 / 1813
Top 28%
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
7:30/mi
23:19
↑ 97↓ 3451.5%
10K· 6.21 mi
7:42/mi
47:13
↑ 79↓ 1380.4%
15K· 9.32 mi
7:54/mi
1:11:45
↑ 67↓ 78
20K· 12.43 mi
7:59/mi
1:36:32
↑ 106↓ 860.1%
Half· 13.11 mi
7:50/mi
1:41:53
↑ 19↓ 370.5%
25K· 15.53 mi
8:18/mi
2:02:01
↑ 66↓ 880.2%
30K· 18.64 mi
8:40/mi
2:28:58
↑ 181↓ 1480.2%
20M
8:23/mi
2:40:22
↑ 64↓ 500.2%
21M
9:23/mi
2:49:45
↑ 106↓ 241.6%
35K· 21.75 mi
9:07/mi
2:56:34
↑ 17↓ 861.7%
23M
8:46/mi
3:07:32
↑ 23↓ 630.6%
24M
8:09/mi
3:15:41
↓ 821.3%
40K· 24.85 mi
8:35/mi
3:23:01
↓ 200.3%
25.2M
9:43/mi
3:26:22
↑ 13↓ 160.2%
Finish· 26.22 mi
8:20/mi
3:34:52
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:41:53
Pace7:46 /mi
2nd Half
Distance13.11 mi
Time1:52:59
Pace8:37 /mi
📊Positive Split: 10.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:1923:197:3023:19
7:30
-
10K
6.21 mi11:43:1347:137:3623:54
7:42
+0:12
15K
9.32 mi12:07:451:11:457:4224:32
7:54
+0:12
20K
12.43 mi12:32:321:36:327:4624:47
7:59
+0:05
Half
13.11 mi12:37:531:41:537:465:21
7:50
-0:09
25K
15.53 mi12:58:012:02:017:5120:08
8:18
+0:28
30K
18.64 mi13:24:582:28:587:5926:57
8:40
+0:22
20M
20.00 mi13:36:222:40:228:0111:24
8:23
-0:17
21M
21.00 mi13:45:452:49:458:059:23
9:23
+1:00
35K
21.75 mi13:52:342:56:348:076:49
9:07
-0:16
23M
23.00 mi14:03:323:07:328:0910:58
8:46
-0:21
24M
24.00 mi14:11:413:15:418:098:09
8:09
-0:37
40K
24.85 mi14:19:013:23:018:107:20
8:35
+0:26
25.2M
25.20 mi14:22:223:26:228:113:21
9:43
+1:08
Finish
26.22 mi14:30:523:34:528:128:30
8:20
-1:23

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

7:30 /mi

Average Pace

8:12 /mi

Slowest Pace

9:43 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:41:53

47% of race

Time at Steady Pace

55:31

26% of race

Time at Slower Pace

57:28

27% of race

Average Pace: 8:12 /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 mi11:19:1923:197:3023:19
7:30
#12313
10K
6.21 mi11:43:1347:137:3623:54
7:42
#13043
15K
9.32 mi12:07:451:11:457:4224:32
7:54
#13728
20K
12.43 mi12:32:321:36:327:4624:47
7:59
#13980
Half
13.11 mi12:37:531:41:537:465:21
7:50
#14014
25K
15.53 mi12:58:012:02:017:5120:08
8:18
#14344
30K
18.64 mi13:24:582:28:587:5926:57
8:40
#14645
20M
20.00 mi13:36:222:40:228:0111:24
8:23
#14470
21M
21.00 mi13:45:452:49:458:059:23
9:23
#14535
35K
21.75 mi13:52:342:56:348:076:49
9:07
#14706
23M
23.00 mi14:03:323:07:328:0910:58
8:46
#14693
24M
24.00 mi14:11:413:15:418:098:09
8:09
#14575
40K
24.85 mi14:19:013:23:018:107:20
8:35
#14508
25.2M
25.20 mi14:22:223:26:228:113:21
9:43
#14531
Finish
26.22 mi14:30:523:34:528:128:30
8:20
#14539
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi123132974297415225(Top 54%)4706(Top 38%)4706(Top 260%)
10K6.21 mi3.10 mi13043-7303367-3933367-39313847(Top 49%)3869(Top 32%)3869(Top 213%)
15K9.32 mi3.11 mi13728-6853814-4473814-44715225(Top 54%)4706(Top 38%)4706(Top 260%)
20K12.43 mi3.11 mi13980-2523992-1783992-17814765(Top 52%)4516(Top 37%)4516(Top 249%)
Half13.11 mi0.68 mi14014-344008-164008-1614675(Top 52%)4442(Top 36%)4442(Top 245%)
25K15.53 mi2.42 mi14344-3304238-2304238-23015950(Top 56%)5282(Top 43%)5282(Top 291%)
30K18.64 mi3.11 mi14645-3014469-2314469-23115854(Top 56%)5372(Top 44%)5372(Top 296%)
20M20.00 mi1.36 mi14470+1754400+694400+6913113(Top 46%)4048(Top 33%)4048(Top 223%)
21M21.00 mi1.00 mi14535-654461-614461-6115550(Top 55%)5475(Top 45%)5475(Top 302%)
35K21.75 mi0.75 mi14706-1714570-1094570-10918780(Top 66%)7331(Top 60%)7331(Top 404%)
23M23.00 mi1.25 mi14693+134598-284598-2814890(Top 52%)5270(Top 43%)5270(Top 291%)
24M24.00 mi1.00 mi14575+1184557+414557+4112267(Top 43%)3937(Top 32%)3937(Top 217%)
40K24.85 mi0.85 mi14508+674552+54552+513948(Top 49%)4934(Top 40%)4934(Top 272%)
25.2M25.20 mi0.35 mi14531-234581-294581-2915705(Top 55%)5916(Top 48%)5916(Top 326%)
Finish26.22 mi1.02 mi14539-84618-374618-3715205(Top 54%)5590(Top 46%)5590(Top 308%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 54%
×21story building
+97ft-345ft

Overall

15225

Females

4706

F45-49

4706

5K→10K

3.1 - 6.2 mi

Top 49%
×5story building
+79ft-138ft

Overall

13847

Females

3869

F45-49

3869

10K→15K

6.2 - 9.3 mi

Top 54%
×3story building
+67ft-78ft

Overall

15225

Females

4706

F45-49

4706

15K→20K

9.3 - 12.4 mi

Top 52%
×5story building
+106ft-86ft

Overall

14765

Females

4516

F45-49

4516

20K→Half

12.4 - 13.1 mi

Top 52%
×2story building
+19ft-37ft

Overall

14675

Females

4442

F45-49

4442

Half→25K

13.1 - 15.5 mi

Top 56%
×4story building
+66ft-88ft

Overall

15950

Females

5282

F45-49

5282

25K→30K

15.5 - 18.6 mi

Top 56%
×9story building
+181ft-148ft

Overall

15854

Females

5372

F45-49

5372

30K→20M

18.6 - 20.0 mi

Top 46%
×5story building
+64ft-50ft

Overall

13113

Females

4048

F45-49

4048

20M→21M

20.0 - 21.0 mi

Top 55%
×8story building
+106ft-24ft

Overall

15550

Females

5475

F45-49

5475

21M→35K

21.0 - 21.8 mi

Top 66%
×7story building
+17ft-86ft

Overall

18780

Females

7331

F45-49

7331

35K→23M

21.8 - 23.0 mi

Top 52%
×5story building
+23ft-63ft

Overall

14890

Females

5270

F45-49

5270

23M→24M

23.0 - 24.0 mi

Top 43%
×6story building
+12ft-82ft

Overall

12267

Females

3937

F45-49

3937

24M→40K

24.0 - 24.9 mi

Top 49%
×1story
+6ft-20ft

Overall

13948

Females

4934

F45-49

4934

40K→25.2M

24.9 - 25.2 mi

Top 55%
×1story
+13ft-16ft

Overall

15705

Females

5916

F45-49

5916

25.2M→Finish

25.2 - 26.2 mi

Top 54%
×2story building
+22ft-21ft

Overall

15205

Females

5590

F45-49

5590

Passing Analysis

Category:
Athletes Passed
1339
Passed By
3565
Net Change
-2226
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12313
5K → 10K64794-730#12313#13043
10K → 15K61746-685#13043#13728
15K → 20K145397-252#13728#13980
20K → Half2458-34#13980#14014
Half → 25K94424-330#14014#14344
25K → 30K155456-301#14344#14645
30K → 20M21843+175#14645#14470
20M → 21M99164-65#14470#14535
21M → 35K29200-171#14535#14706
35K → 23M10794+13#14706#14693
23M → 24M14527+118#14693#14575
24M → 40K9831+67#14575#14508
40K → 25.2M2750-23#14508#14531
25.2M → Finish7381-8#14531#14539
TOTALS13393565-2226
📊

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