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BOSTON MARATHON 2025

Jama Lau

Bib: 20418 F HK

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 42%
Masters (Masters Women)
#0 / 6759
Top 28%
Division (F50-54)
#0 / 1303
Top 20%
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
8:13/mi
25:33
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
8:07/mi
50:46
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
8:18/mi
1:16:32
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
8:20/mi
1:42:25
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
8:12/mi
1:48:01
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:17/mi
2:08:06
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:29/mi
2:34:27
↑ 181↓ 1480.2%
138 ft elev
20M
8:29/mi
2:45:59
↑ 64↓ 500.2%
148 ft elev
21M
8:59/mi
2:54:58
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:05/mi
3:01:01
↑ 17↓ 861.7%
156 ft elev
23M
8:23/mi
3:11:31
↑ 23↓ 630.6%
116 ft elev
24M
8:04/mi
3:19:35
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:14/mi
3:26:37
↓ 200.3%
20 ft elev
25.2M
9:11/mi
3:29:47
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:01/mi
3:37:57
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:48:01
Pace8:14 /mi
2nd Half
Distance13.11 mi
Time1:49:56
Pace8:23 /mi
📊Positive Split: 1.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:23:4925:338:1325:33
8:13
-
10K
6.21 mi11:49:0250:468:1025:13
8:07
-0:06
15K
9.32 mi12:14:481:16:328:1325:46
8:18
+0:11
20K
12.43 mi12:40:411:42:258:1425:53
8:20
+0:02
Half
13.11 mi12:46:171:48:018:145:36
8:12
-0:08
25K
15.53 mi13:06:222:08:068:1520:05
8:17
+0:05
30K
18.64 mi13:32:432:34:278:1726:21
8:29
+0:12
20M
20.00 mi13:44:152:45:598:1811:32
8:29
0:00
21M
21.00 mi13:53:142:54:588:208:59
8:59
+0:30
35K
21.75 mi13:59:173:01:018:196:03
8:05
-0:54
23M
23.00 mi14:09:473:11:318:2010:30
8:23
+0:18
24M
24.00 mi14:17:513:19:358:198:04
8:04
-0:19
40K
24.85 mi14:24:533:26:378:197:02
8:14
+0:10
25.2M
25.20 mi14:28:033:29:478:193:10
9:11
+0:57
Finish
26.22 mi14:36:133:37:578:198:10
8:01
-1:10

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

8:01 /mi

Average Pace

8:19 /mi

Slowest Pace

9:11 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:25:48

94% of race

Time at Steady Pace

12:09

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:19 /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 mi11:23:4925:338:1325:33
8:13
#18264
10K
6.21 mi11:49:0250:468:1025:13
8:07
#17769
15K
9.32 mi12:14:481:16:328:1325:46
8:18
#17824
20K
12.43 mi12:40:411:42:258:1425:53
8:20
#17620
Half
13.11 mi12:46:171:48:018:145:36
8:12
#17610
25K
15.53 mi13:06:222:08:068:1520:05
8:17
#17256
30K
18.64 mi13:32:432:34:278:1726:21
8:29
#16742
20M
20.00 mi13:44:152:45:598:1811:32
8:29
#16509
21M
21.00 mi13:53:142:54:588:208:59
8:59
#16277
35K
21.75 mi13:59:173:01:018:196:03
8:05
#16128
23M
23.00 mi14:09:473:11:318:2010:30
8:23
#15866
24M
24.00 mi14:17:513:19:358:198:04
8:04
#15669
40K
24.85 mi14:24:533:26:378:197:02
8:14
#15507
25.2M
25.20 mi14:28:033:29:478:193:10
9:11
#15459
Finish
26.22 mi14:36:133:37:578:198:10
8:01
#15371
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi182646500650018007(Top 63%)6318(Top 52%)6318(Top 485%)
10K6.21 mi3.10 mi17769+4956184+3166184+31617329(Top 61%)5896(Top 48%)5896(Top 452%)
15K9.32 mi3.11 mi17824-556222-386222-3818007(Top 63%)6318(Top 52%)6318(Top 485%)
20K12.43 mi3.11 mi17620+2046110+1126110+11217111(Top 60%)5830(Top 48%)5830(Top 447%)
Half13.11 mi0.68 mi17610+106103+76103+717331(Top 61%)5930(Top 48%)5930(Top 455%)
25K15.53 mi2.42 mi17256+3545916+1875916+18715816(Top 56%)5204(Top 43%)5204(Top 399%)
30K18.64 mi3.11 mi16742+5145662+2545662+25414643(Top 52%)4708(Top 39%)4708(Top 361%)
20M20.00 mi1.36 mi16509+2335559+1035559+10313731(Top 48%)4380(Top 36%)4380(Top 336%)
21M21.00 mi1.00 mi16277+2325457+1025457+10213431(Top 47%)4337(Top 35%)4337(Top 333%)
35K21.75 mi0.75 mi16128+1495400+575400+5712904(Top 45%)4123(Top 34%)4123(Top 316%)
23M23.00 mi1.25 mi15866+2625289+1115289+11112623(Top 44%)4072(Top 33%)4072(Top 313%)
24M24.00 mi1.00 mi15669+1975191+985191+9811734(Top 41%)3687(Top 30%)3687(Top 283%)
40K24.85 mi0.85 mi15507+1625133+585133+5811770(Top 41%)3805(Top 31%)3805(Top 292%)
25.2M25.20 mi0.35 mi15459+485116+175116+1712904(Top 45%)4462(Top 36%)4462(Top 342%)
Finish26.22 mi1.02 mi15371+885088+285088+2813008(Top 46%)4444(Top 36%)4444(Top 341%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 63%
×21story building
+97ft-345ft

Overall

18007

Females

6318

F50-54

6318

5K→10K

3.1 - 6.2 mi

Top 61%
×5story building
+79ft-138ft

Overall

17329

Females

5896

F50-54

5896

10K→15K

6.2 - 9.3 mi

Top 63%
×3story building
+67ft-78ft

Overall

18007

Females

6318

F50-54

6318

15K→20K

9.3 - 12.4 mi

Top 60%
×5story building
+106ft-86ft

Overall

17111

Females

5830

F50-54

5830

20K→Half

12.4 - 13.1 mi

Top 61%
×2story building
+19ft-37ft

Overall

17331

Females

5930

F50-54

5930

Half→25K

13.1 - 15.5 mi

Top 56%
×4story building
+66ft-88ft

Overall

15816

Females

5204

F50-54

5204

25K→30K

15.5 - 18.6 mi

Top 52%
×9story building
+181ft-148ft

Overall

14643

Females

4708

F50-54

4708

30K→20M

18.6 - 20.0 mi

Top 48%
×5story building
+64ft-50ft

Overall

13731

Females

4380

F50-54

4380

20M→21M

20.0 - 21.0 mi

Top 47%
×8story building
+106ft-24ft

Overall

13431

Females

4337

F50-54

4337

21M→35K

21.0 - 21.8 mi

Top 45%
×7story building
+17ft-86ft

Overall

12904

Females

4123

F50-54

4123

35K→23M

21.8 - 23.0 mi

Top 44%
×5story building
+23ft-63ft

Overall

12623

Females

4072

F50-54

4072

23M→24M

23.0 - 24.0 mi

Top 41%
×6story building
+12ft-82ft

Overall

11734

Females

3687

F50-54

3687

24M→40K

24.0 - 24.9 mi

Top 41%
×1story
+6ft-20ft

Overall

11770

Females

3805

F50-54

3805

40K→25.2M

24.9 - 25.2 mi

Top 45%
×1story
+13ft-16ft

Overall

12904

Females

4462

F50-54

4462

25.2M→Finish

25.2 - 26.2 mi

Top 46%
×2story building
+22ft-21ft

Overall

13008

Females

4444

F50-54

4444

Passing Analysis

Category:
Athletes Passed
3442
Passed By
549
Net Change
+2893
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18264
5K → 10K595100+495#18264#17769
10K → 15K173228-55#17769#17824
15K → 20K29389+204#17824#17620
20K → Half4131+10#17620#17610
Half → 25K37218+354#17610#17256
25K → 30K53218+514#17256#16742
30K → 20M24411+233#16742#16509
20M → 21M24513+232#16509#16277
21M → 35K1523+149#16277#16128
35K → 23M2686+262#16128#15866
23M → 24M2014+197#15866#15669
24M → 40K1642+162#15669#15507
40K → 25.2M568+48#15507#15459
25.2M → Finish10618+88#15459#15371
TOTALS3442549+2893
📊

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