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BOSTON MARATHON 2025

Delia Chan

ON

Bib: 18332 F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 39%
Masters (Masters Women)
#0 / 6759
Top 24%
Division (F45-49)
#0 / 1813
Top 29%
Race Day Weather
50°/40°F
broken clouds

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:41/mi
23:53
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:46/mi
48:00
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:49/mi
1:12:17
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
8:20/mi
1:38:11
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:46/mi
1:43:29
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:42/mi
2:04:34
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:28/mi
2:30:52
↑ 181↓ 1480.2%
138 ft elev
20M
8:31/mi
2:42:26
↑ 64↓ 500.2%
148 ft elev
21M
9:33/mi
2:51:59
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:19/mi
2:58:12
↑ 17↓ 861.7%
156 ft elev
23M
8:14/mi
3:08:31
↑ 23↓ 630.6%
116 ft elev
24M
8:32/mi
3:17:03
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:25/mi
3:24:15
↓ 200.3%
20 ft elev
25.2M
8:19/mi
3:27:07
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:19/mi
3:35:36
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:43:297:54 /mi⚡ faster
2nd Half
1:52:078:33 /mi+8.3%
Positive split — 8.3% slower in the second half
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Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointTimeAvg PaceSegment LengthSegment TimeSegment PaceTrendDiff
5K
23:537:413.11 mi23:53
7:41
-
10K
48:007:433.10 mi24:07
7:46
+0:05
15K
1:12:177:453.11 mi24:17
7:49
+0:03
20K
1:38:117:543.11 mi25:54
8:20
+0:31
Half(13.11 mi)
1:43:297:540.68 mi5:18
7:46
-0:34
25K
2:04:348:012.42 mi21:05
8:42
+0:56
30K
2:30:528:063.11 mi26:18
8:28
-0:14
20M
2:42:268:071.36 mi11:34
8:31
+0:03
21M
2:51:598:111.00 mi9:33
9:33
+1:02
35K
2:58:128:120.75 mi6:13
8:19
-1:14
23M
3:08:318:121.25 mi10:19
8:14
-0:05
24M
3:17:038:131.00 mi8:32
8:32
+0:18
40K
3:24:158:130.85 mi7:12
8:25
-0:07
25.2M
3:27:078:130.35 mi2:52
8:19
-0:06
Finish(26.22 mi)
3:35:368:141.02 mi8:29
8:19
0:00
Trend:
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoints & Pacing

Pace Line

Fastest Pace

7:41 /mi

Average Pace

8:14 /mi

Slowest Pace

9:33 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Time at Faster Pace

1:17:35

36% of race

Time at Steady Pace

1:47:23

50% of race

Time at Slower Pace

30:38

14% of race

Average Pace: 8:13 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

Heatmap

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Checkpoint and Segment Rankings

CheckpointSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi13886383238321452943304330
10K3.10 mi14115-2294004-1724004-1721448642444244
15K3.11 mi14255-1404117-1134117-1131452943304330
20K3.11 mi15106-8514636-5194636-5191713958455845
Half(13.11 mi)0.68 mi15039+674606+304606+301408741204120
25K2.42 mi15705-6664997-3914997-3911836066256625
30K3.11 mi15456+2494922+754922+751455946594659
20M1.36 mi15302+1544860+624860+621389544614461
21M1.00 mi15329-274907-474907-471631458735873
35K0.75 mi15253+764879+284879+281433548664866
23M1.25 mi14994+2594763+1164763+1161168635843584
24M1.00 mi14953+414779-164779-161474652345234
40K0.85 mi14862+914752+274752+271296244244424
25.2M0.35 mi14739+1234694+584694+58783920282028
Finish(26.22 mi)1.02 mi14723+164709-154709-151502355085508

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 51%
×21story building
+97ft-345ft

Overall

14529

Females

4330

F45-49

4330

5K→10K

3.1 - 6.2 mi

Top 51%
×5story building
+79ft-138ft

Overall

14486

Females

4244

F45-49

4244

10K→15K

6.2 - 9.3 mi

Top 51%
×3story building
+67ft-78ft

Overall

14529

Females

4330

F45-49

4330

15K→20K

9.3 - 12.4 mi

Top 60%
×5story building
+106ft-86ft

Overall

17139

Females

5845

F45-49

5845

20K→Half

12.4 - 13.1 mi

Top 50%
×2story building
+19ft-37ft

Overall

14087

Females

4120

F45-49

4120

Half→25K

13.1 - 15.5 mi

Top 65%
×4story building
+66ft-88ft

Overall

18360

Females

6625

F45-49

6625

25K→30K

15.5 - 18.6 mi

Top 51%
×9story building
+181ft-148ft

Overall

14559

Females

4659

F45-49

4659

30K→20M

18.6 - 20.0 mi

Top 49%
×5story building
+64ft-50ft

Overall

13895

Females

4461

F45-49

4461

20M→21M

20.0 - 21.0 mi

Top 57%
×8story building
+106ft-24ft

Overall

16314

Females

5873

F45-49

5873

21M→35K

21.0 - 21.8 mi

Top 50%
×7story building
+17ft-86ft

Overall

14335

Females

4866

F45-49

4866

35K→23M

21.8 - 23.0 mi

Top 41%
×5story building
+23ft-63ft

Overall

11686

Females

3584

F45-49

3584

23M→24M

23.0 - 24.0 mi

Top 52%
×6story building
+12ft-82ft

Overall

14746

Females

5234

F45-49

5234

24M→40K

24.0 - 24.9 mi

Top 46%
×1story
+6ft-20ft

Overall

12962

Females

4424

F45-49

4424

40K→25.2M

24.9 - 25.2 mi

Top 28%
×1story
+13ft-16ft

Overall

7839

Females

2028

F45-49

2028

25.2M→Finish

25.2 - 26.2 mi

Top 53%
×2story building
+22ft-21ft

Overall

15023

Females

5508

F45-49

5508

Passing Analysis

Category:
Passed
1977
Passed By
2814
Net Change
-837
SegmentPassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13886
5K → 10K171400-229#13886#14115
10K → 15K160300-140#14115#14255
15K → 20K63914-851#14255#15106
20K → Half8215+67#15106#15039
Half → 25K50716-666#15039#15705
25K → 30K364115+249#15705#15456
30K → 20M19036+154#15456#15302
20M → 21M108135-27#15302#15329
21M → 35K10327+76#15329#15253
35K → 23M2678+259#15253#14994
23M → 24M10362+41#14994#14953
24M → 40K11221+91#14953#14862
40K → 25.2M1230+123#14862#14739
25.2M → Finish8165+16#14739#14723
TOTALS19772814-837

Passing Charts

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