Boston Marathon logo
BOSTON MARATHON 2025

Claire Sim

Bib: 31856•F

MA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F40-44)
#0 / 1718
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
10:24/mi
32:20
↑ 97↓ 3451.5%
10K· 6.21 mi
10:57/mi
1:06:22
↑ 79↓ 1380.4%
15K· 9.32 mi
11:25/mi
1:41:49
↑ 67↓ 78
20K· 12.43 mi
12:51/mi
2:21:45
↑ 106↓ 860.1%
Half· 13.11 mi
11:38/mi
2:29:41
↑ 19↓ 370.5%
25K· 15.53 mi
13:53/mi
3:03:20
↑ 66↓ 880.2%
30K· 18.64 mi
13:03/mi
3:43:53
↑ 181↓ 1480.2%
20M
13:17/mi
4:01:56
↑ 64↓ 500.2%
21M
15:28/mi
4:17:24
↑ 106↓ 241.6%
35K· 21.75 mi
12:38/mi
4:26:51
↑ 17↓ 861.7%
23M
13:41/mi
4:43:59
↑ 23↓ 630.6%
24M
12:57/mi
4:56:56
↓ 821.3%
40K· 24.85 mi
13:21/mi
5:08:21
↓ 200.3%
25.2M
13:46/mi
5:13:06
↑ 13↓ 160.2%
Finish· 26.22 mi
11:35/mi
5:24:54
↑ 22↓ 21

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:29:41
Pace11:25 /mi
2nd Half
Distance13.11 mi
Time2:55:13
Pace13:22 /mi
📊Positive Split: 17.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:54:5332:2010:2432:20
10:24
-
10K
6.21 mi12:28:551:06:2210:4134:02
10:57
+0:33
15K
9.32 mi13:04:221:41:4910:5535:27
11:25
+0:28
20K
12.43 mi13:44:182:21:4511:2439:56
12:51
+1:26
Half
13.11 mi13:52:142:29:4111:257:56
11:38
-1:13
25K
15.53 mi14:25:533:03:2011:4833:39
13:53
+2:15
30K
18.64 mi15:06:263:43:5312:0140:33
13:03
-0:50
20M
20.00 mi15:24:294:01:5612:0618:03
13:17
+0:14
21M
21.00 mi15:39:574:17:2412:1515:28
15:28
+2:11
35K
21.75 mi15:49:244:26:5112:169:27
12:38
-2:50
23M
23.00 mi16:06:324:43:5912:2117:08
13:41
+1:03
24M
24.00 mi16:19:294:56:5612:2212:57
12:57
-0:44
40K
24.85 mi16:30:545:08:2112:2411:25
13:21
+0:24
25.2M
25.20 mi16:35:395:13:0612:254:45
13:46
+0:25
Finish
26.22 mi16:47:275:24:5412:2411:48
11:35
-2:11

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

10:24 /mi

Average Pace

12:24 /mi

Slowest Pace

15:28 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:01:33

37% of race

Time at Steady Pace

2:12:21

41% of race

Time at Slower Pace

1:11:00

22% of race

Average Pace: 12:23 /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 mi11:54:5332:2010:2432:20
10:24
#26553
10K
6.21 mi12:28:551:06:2210:4134:02
10:57
#26819
15K
9.32 mi13:04:221:41:4910:5535:27
11:25
#26972
20K
12.43 mi13:44:182:21:4511:2439:56
12:51
#27280
Half
13.11 mi13:52:142:29:4111:257:56
11:38
#27275
25K
15.53 mi14:25:533:03:2011:4833:39
13:53
#27416
30K
18.64 mi15:06:263:43:5312:0140:33
13:03
#27294
20M
20.00 mi15:24:294:01:5612:0618:03
13:17
#27285
21M
21.00 mi15:39:574:17:2412:1515:28
15:28
#27315
35K
21.75 mi15:49:244:26:5112:169:27
12:38
#27301
23M
23.00 mi16:06:324:43:5912:2117:08
13:41
#27298
24M
24.00 mi16:19:294:56:5612:2212:57
12:57
#27280
40K
24.85 mi16:30:545:08:2112:2411:25
13:21
#27281
25.2M
25.20 mi16:35:395:13:0612:254:45
13:46
#27268
Finish
26.22 mi16:47:275:24:5412:2411:48
11:35
#27244
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi26553110721107227147(Top 96%)11462(Top 94%)11462(Top 667%)
10K6.21 mi3.10 mi26819-26611232-16011232-16027003(Top 95%)11375(Top 93%)11375(Top 662%)
15K9.32 mi3.11 mi26972-15311342-11011342-11027147(Top 96%)11462(Top 94%)11462(Top 667%)
20K12.43 mi3.11 mi27280-30811532-19011532-19027735(Top 98%)11831(Top 97%)11831(Top 689%)
Half13.11 mi0.68 mi27275+511527+511527+527163(Top 96%)11509(Top 94%)11509(Top 670%)
25K15.53 mi2.42 mi27416-14111629-10211629-10227827(Top 98%)11906(Top 97%)11906(Top 693%)
30K18.64 mi3.11 mi27294+12211582+4711582+4726733(Top 94%)11350(Top 93%)11350(Top 661%)
20M20.00 mi1.36 mi27285+911576+611576+626703(Top 94%)11405(Top 93%)11405(Top 664%)
21M21.00 mi1.00 mi27315-3011602-2611602-2627500(Top 97%)11816(Top 97%)11816(Top 688%)
35K21.75 mi0.75 mi27301+1411601+111601+126594(Top 94%)11387(Top 93%)11387(Top 663%)
23M23.00 mi1.25 mi27298+311607-611607-627048(Top 95%)11633(Top 95%)11633(Top 677%)
24M24.00 mi1.00 mi27280+1811605+211605+226797(Top 94%)11532(Top 94%)11532(Top 671%)
40K24.85 mi0.85 mi27281-1116051160526629(Top 94%)11460(Top 94%)11460(Top 667%)
25.2M25.20 mi0.35 mi27268+1311599+611599+625994(Top 92%)11182(Top 91%)11182(Top 651%)
Finish26.22 mi1.02 mi27244+2411593+611593+626252(Top 92%)11281(Top 92%)11281(Top 657%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 96%
×21story building
+97ft-345ft

Overall

27147

Females

11462

F40-44

11462

5K→10K

3.1 - 6.2 mi

Top 95%
×5story building
+79ft-138ft

Overall

27003

Females

11375

F40-44

11375

10K→15K

6.2 - 9.3 mi

Top 96%
×3story building
+67ft-78ft

Overall

27147

Females

11462

F40-44

11462

15K→20K

9.3 - 12.4 mi

Top 98%
×5story building
+106ft-86ft

Overall

27735

Females

11831

F40-44

11831

20K→Half

12.4 - 13.1 mi

Top 96%
×2story building
+19ft-37ft

Overall

27163

Females

11509

F40-44

11509

Half→25K

13.1 - 15.5 mi

Top 98%
×4story building
+66ft-88ft

Overall

27827

Females

11906

F40-44

11906

25K→30K

15.5 - 18.6 mi

Top 94%
×9story building
+181ft-148ft

Overall

26733

Females

11350

F40-44

11350

30K→20M

18.6 - 20.0 mi

Top 94%
×5story building
+64ft-50ft

Overall

26703

Females

11405

F40-44

11405

20M→21M

20.0 - 21.0 mi

Top 97%
×8story building
+106ft-24ft

Overall

27500

Females

11816

F40-44

11816

21M→35K

21.0 - 21.8 mi

Top 94%
×7story building
+17ft-86ft

Overall

26594

Females

11387

F40-44

11387

35K→23M

21.8 - 23.0 mi

Top 95%
×5story building
+23ft-63ft

Overall

27048

Females

11633

F40-44

11633

23M→24M

23.0 - 24.0 mi

Top 94%
×6story building
+12ft-82ft

Overall

26797

Females

11532

F40-44

11532

24M→40K

24.0 - 24.9 mi

Top 94%
×1story
+6ft-20ft

Overall

26629

Females

11460

F40-44

11460

40K→25.2M

24.9 - 25.2 mi

Top 92%
×1story
+13ft-16ft

Overall

25994

Females

11182

F40-44

11182

25.2M→Finish

25.2 - 26.2 mi

Top 92%
×2story building
+22ft-21ft

Overall

26252

Females

11281

F40-44

11281

Passing Analysis

Category:
Athletes Passed
571
Passed By
1262
Net Change
-691
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#26553
5K → 10K84350-266#26553#26819
10K → 15K69222-153#26819#26972
15K → 20K28336-308#26972#27280
20K → Half1914+5#27280#27275
Half → 25K33174-141#27275#27416
25K → 30K14826+122#27416#27294
30K → 20M2718+9#27294#27285
20M → 21M1545-30#27285#27315
21M → 35K2612+14#27315#27301
35K → 23M3027+3#27301#27298
23M → 24M2810+18#27298#27280
24M → 40K1718-1#27280#27281
40K → 25.2M141+13#27281#27268
25.2M → Finish339+24#27268#27244
TOTALS5711262-691
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing