Boston Marathon logo
BOSTON MARATHON 2024

Pei-Ling Lai

Bib: 17377•F

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 25550
Top 47%
Gender (Female)
#0 / 10924
Top 35%
Masters (Masters Women)
#0 / 6263
Top 22%
Division (F45-49)
#0 / 1753
Top 27%
Race Day Weather
55°/45°F
scattered 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
7:48/mi
24:15
↑ 97↓ 3451.5%
10K· 6.21 mi
7:46/mi
48:23
↑ 79↓ 1380.4%
15K· 9.32 mi
7:53/mi
1:12:51
↑ 67↓ 78
20K· 12.43 mi
8:16/mi
1:38:32
↑ 106↓ 860.1%
Half· 13.11 mi
7:56/mi
1:43:57
↑ 19↓ 370.5%
25K· 15.53 mi
8:32/mi
2:04:39
↑ 66↓ 880.2%
30K· 18.64 mi
8:45/mi
2:31:49
↑ 181↓ 1480.2%
20M
8:59/mi
2:44:01
↑ 64↓ 500.2%
21M
9:54/mi
2:53:55
↑ 106↓ 241.6%
35K· 21.75 mi
8:28/mi
3:00:15
↑ 17↓ 861.7%
23M
9:16/mi
3:11:51
↑ 23↓ 630.6%
24M
8:46/mi
3:20:37
↓ 821.3%
40K· 24.85 mi
8:59/mi
3:28:18
↓ 200.3%
25.2M
9:52/mi
3:31:42
↑ 13↓ 160.2%
Finish· 26.22 mi
8:47/mi
3:40:39
↑ 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
Time1:43:57
Pace7:56 /mi
2nd Half
Distance13.11 mi
Time1:56:42
Pace8:54 /mi
📊Positive Split: 12.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:14:5424:157:4824:15
7:48
-
10K
6.21 mi11:39:0248:237:4724:08
7:46
-0:02
15K
9.32 mi12:03:301:12:517:4924:28
7:53
+0:07
20K
12.43 mi12:29:111:38:327:5625:41
8:16
+0:23
Half
13.11 mi12:34:361:43:577:565:25
7:56
-0:20
25K
15.53 mi12:55:182:04:398:0120:42
8:32
+0:36
30K
18.64 mi13:22:282:31:498:0927:10
8:45
+0:13
20M
20.00 mi13:34:402:44:018:1212:12
8:59
+0:14
21M
21.00 mi13:44:342:53:558:179:54
9:54
+0:55
35K
21.75 mi13:50:543:00:158:176:20
8:28
-1:26
23M
23.00 mi14:02:303:11:518:2011:36
9:16
+0:48
24M
24.00 mi14:11:163:20:378:228:46
8:46
-0:30
40K
24.85 mi14:18:573:28:188:237:41
8:59
+0:13
25.2M
25.20 mi14:22:213:31:428:243:24
9:52
+0:53
Finish
26.22 mi14:31:183:40:398:258:57
8:47
-1:05

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

7:46 /mi

Average Pace

8:25 /mi

Slowest Pace

9:54 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:43:57

47% of race

Time at Steady Pace

1:31:48

42% of race

Time at Slower Pace

24:54

11% of race

Average Pace: 8:25 /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 mi11:14:5424:157:4824:15
7:48
#13142
10K
6.21 mi11:39:0248:237:4724:08
7:46
#12774
15K
9.32 mi12:03:301:12:517:4924:28
7:53
#12649
20K
12.43 mi12:29:111:38:327:5625:41
8:16
#12855
Half
13.11 mi12:34:361:43:577:565:25
7:56
#12827
25K
15.53 mi12:55:182:04:398:0120:42
8:32
#12897
30K
18.64 mi13:22:282:31:498:0927:10
8:45
#12629
20M
20.00 mi13:34:402:44:018:1212:12
8:59
#12535
21M
21.00 mi13:44:342:53:558:179:54
9:54
#12502
35K
21.75 mi13:50:543:00:158:176:20
8:28
#12405
23M
23.00 mi14:02:303:11:518:2011:36
9:16
#12358
24M
24.00 mi14:11:163:20:378:228:46
8:46
#12244
40K
24.85 mi14:18:573:28:188:237:41
8:59
#12172
25.2M
25.20 mi14:22:213:31:428:243:24
9:52
#12113
Finish
26.22 mi14:31:183:40:398:258:57
8:47
#12129
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi131423804380412506(Top 49%)3516(Top 32%)3516(Top 201%)
10K6.21 mi3.10 mi12774+3683612+1923612+19212407(Top 49%)3417(Top 31%)3417(Top 195%)
15K9.32 mi3.11 mi12649+1253547+653547+6512506(Top 49%)3516(Top 32%)3516(Top 201%)
20K12.43 mi3.11 mi12855-2063691-1443691-14413533(Top 53%)4147(Top 38%)4147(Top 237%)
Half13.11 mi0.68 mi12827+283686+53686+512385(Top 48%)3540(Top 32%)3540(Top 202%)
25K15.53 mi2.42 mi12897-703754-683754-6813257(Top 52%)4186(Top 38%)4186(Top 239%)
30K18.64 mi3.11 mi12629+2683693+613693+6111924(Top 47%)3697(Top 34%)3697(Top 211%)
20M20.00 mi1.36 mi12535+943704-113704-1112024(Top 47%)4036(Top 37%)4036(Top 230%)
21M21.00 mi1.00 mi12502+333747-433747-4312587(Top 49%)4568(Top 42%)4568(Top 261%)
35K21.75 mi0.75 mi12405+973737+103737+1010573(Top 41%)3533(Top 32%)3533(Top 202%)
23M23.00 mi1.25 mi12358+473773-363773-3612455(Top 49%)4643(Top 43%)4643(Top 265%)
24M24.00 mi1.00 mi12244+1143761+123761+1210958(Top 43%)3904(Top 36%)3904(Top 223%)
40K24.85 mi0.85 mi12172+723764-33764-310831(Top 42%)3981(Top 36%)3981(Top 227%)
25.2M25.20 mi0.35 mi12113+593750+143750+1410395(Top 41%)3812(Top 35%)3812(Top 217%)
Finish26.22 mi1.02 mi12129-163789-393789-3913064(Top 51%)4997(Top 46%)4997(Top 285%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 49%
×21story building
+97ft-345ft

Overall

12506

Females

3516

F45-49

3516

5K→10K

3.1 - 6.2 mi

Top 49%
×5story building
+79ft-138ft

Overall

12407

Females

3417

F45-49

3417

10K→15K

6.2 - 9.3 mi

Top 49%
×3story building
+67ft-78ft

Overall

12506

Females

3516

F45-49

3516

15K→20K

9.3 - 12.4 mi

Top 53%
×5story building
+106ft-86ft

Overall

13533

Females

4147

F45-49

4147

20K→Half

12.4 - 13.1 mi

Top 48%
×2story building
+19ft-37ft

Overall

12385

Females

3540

F45-49

3540

Half→25K

13.1 - 15.5 mi

Top 52%
×4story building
+66ft-88ft

Overall

13257

Females

4186

F45-49

4186

25K→30K

15.5 - 18.6 mi

Top 47%
×9story building
+181ft-148ft

Overall

11924

Females

3697

F45-49

3697

30K→20M

18.6 - 20.0 mi

Top 47%
×5story building
+64ft-50ft

Overall

12024

Females

4036

F45-49

4036

20M→21M

20.0 - 21.0 mi

Top 49%
×8story building
+106ft-24ft

Overall

12587

Females

4568

F45-49

4568

21M→35K

21.0 - 21.8 mi

Top 41%
×7story building
+17ft-86ft

Overall

10573

Females

3533

F45-49

3533

35K→23M

21.8 - 23.0 mi

Top 49%
×5story building
+23ft-63ft

Overall

12455

Females

4643

F45-49

4643

23M→24M

23.0 - 24.0 mi

Top 43%
×6story building
+12ft-82ft

Overall

10958

Females

3904

F45-49

3904

24M→40K

24.0 - 24.9 mi

Top 42%
×1story
+6ft-20ft

Overall

10831

Females

3981

F45-49

3981

40K→25.2M

24.9 - 25.2 mi

Top 41%
×1story
+13ft-16ft

Overall

10395

Females

3812

F45-49

3812

25.2M→Finish

25.2 - 26.2 mi

Top 51%
×2story building
+22ft-21ft

Overall

13064

Females

4997

F45-49

4997

Passing Analysis

Category:
Athletes Passed
2697
Passed By
1684
Net Change
+1013
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13142
5K → 10K504136+368#13142#12774
10K → 15K287162+125#12774#12649
15K → 20K209415-206#12649#12855
20K → Half5527+28#12855#12827
Half → 25K226296-70#12827#12897
25K → 30K418150+268#12897#12629
30K → 20M16874+94#12629#12535
20M → 21M149116+33#12535#12502
21M → 35K12124+97#12502#12405
35K → 23M154107+47#12405#12358
23M → 24M15945+114#12358#12244
24M → 40K11038+72#12244#12172
40K → 25.2M689+59#12172#12113
25.2M → Finish6985-16#12113#12129
TOTALS26971684+1013
📊

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