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BOSTON MARATHON 2023

Chelsea Williams

Bib: 13144•F

NV

0:00
0:00
/ mi
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Top 44%
Division (F18-39)
#0 / 4884
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ 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
7:42/mi
23:54
↑ 97↓ 3451.5%
10K· 6.21 mi
7:41/mi
47:47
↑ 79↓ 1380.4%
15K· 9.32 mi
7:48/mi
1:12:00
↑ 67↓ 78
20K· 12.43 mi
8:02/mi
1:36:56
↑ 106↓ 860.1%
Half· 13.11 mi
7:49/mi
1:42:16
↑ 19↓ 370.5%
25K· 15.53 mi
8:08/mi
2:02:00
↑ 66↓ 880.2%
30K· 18.64 mi
8:40/mi
2:28:57
↑ 181↓ 1480.2%
20M
8:51/mi
2:40:58
↑ 64↓ 500.2%
21M
9:41/mi
2:50:39
↑ 106↓ 241.6%
35K· 21.75 mi
8:20/mi
2:56:53
↑ 17↓ 861.7%
23M
9:23/mi
3:08:38
↑ 23↓ 630.6%
24M
10:01/mi
3:18:39
↓ 821.3%
40K· 24.85 mi
10:00/mi
3:27:12
↓ 200.3%
25.2M
12:34/mi
3:31:32
↑ 13↓ 160.2%
Finish· 26.22 mi
9:24/mi
3:41:07
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:42:16
Pace7:48 /mi
2nd Half
Distance13.11 mi
Time1:58:51
Pace9:04 /mi
📊Positive Split: 16.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:5723:547:4223:54
7:42
-
10K
6.21 mi11:15:5047:477:4123:53
7:41
-0:01
15K
9.32 mi11:40:031:12:007:4324:13
7:48
+0:07
20K
12.43 mi12:04:591:36:567:4824:56
8:02
+0:14
Half
13.11 mi12:10:191:42:167:485:20
7:49
-0:13
25K
15.53 mi12:30:032:02:007:5119:44
8:08
+0:19
30K
18.64 mi12:57:002:28:577:5926:57
8:40
+0:32
20M
20.00 mi13:09:012:40:588:0312:01
8:51
+0:11
21M
21.00 mi13:18:422:50:398:089:41
9:41
+0:50
35K
21.75 mi13:24:562:56:538:086:14
8:20
-1:21
23M
23.00 mi13:36:413:08:388:1211:45
9:23
+1:03
24M
24.00 mi13:46:423:18:398:1710:01
10:01
+0:38
40K
24.85 mi13:55:153:27:128:208:33
10:00
-0:01
25.2M
25.20 mi13:59:353:31:328:244:20
12:34
+2:34
Finish
26.22 mi14:09:103:41:078:269:35
9:24
-3:10

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

7:41 /mi

Average Pace

8:26 /mi

Slowest Pace

12:34 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:42:16

46% of race

Time at Steady Pace

1:04:56

29% of race

Time at Slower Pace

53:55

24% of race

Average Pace: 8:26 /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 mi10:51:5723:547:4223:54
7:42
#11400
10K
6.21 mi11:15:5047:477:4123:53
7:41
#11714
15K
9.32 mi11:40:031:12:007:4324:13
7:48
#12014
20K
12.43 mi12:04:591:36:567:4824:56
8:02
#12408
Half
13.11 mi12:10:191:42:167:485:20
7:49
#12423
25K
15.53 mi12:30:032:02:007:5119:44
8:08
#12641
30K
18.64 mi12:57:002:28:577:5926:57
8:40
#13219
20M
20.00 mi13:09:012:40:588:0312:01
8:51
#13411
21M
21.00 mi13:18:422:50:398:089:41
9:41
#13661
35K
21.75 mi13:24:562:56:538:086:14
8:20
#13672
23M
23.00 mi13:36:413:08:388:1211:45
9:23
#13978
24M
24.00 mi13:46:423:18:398:1710:01
10:01
#14426
40K
24.85 mi13:55:153:27:128:208:33
10:00
#14697
25.2M
25.20 mi13:59:353:31:328:244:20
12:34
#14973
Finish
26.22 mi14:09:103:41:078:269:35
9:24
#15211
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi114002543254312713(Top 48%)3302(Top 29%)3302(Top 68%)
10K6.21 mi3.10 mi11714-3142715-1722715-17212142(Top 46%)2955(Top 26%)2955(Top 61%)
15K9.32 mi3.11 mi12014-3002902-1872902-18712713(Top 48%)3302(Top 29%)3302(Top 68%)
20K12.43 mi3.11 mi12408-3943152-2503152-25013673(Top 51%)3923(Top 34%)3923(Top 80%)
Half13.11 mi0.68 mi12423-153163-113163-1112984(Top 49%)3513(Top 31%)3513(Top 72%)
25K15.53 mi2.42 mi12641-2183301-1383301-13813819(Top 52%)4112(Top 36%)4112(Top 84%)
30K18.64 mi3.11 mi13219-5783682-3813682-38115361(Top 58%)5147(Top 45%)5147(Top 105%)
20M20.00 mi1.36 mi13411-1923808-1263808-12615677(Top 59%)5376(Top 47%)5376(Top 110%)
21M21.00 mi1.00 mi13661-2503970-1623970-16216784(Top 63%)6060(Top 53%)6060(Top 124%)
35K21.75 mi0.75 mi13672-113992-223992-2214329(Top 54%)4746(Top 42%)4746(Top 97%)
23M23.00 mi1.25 mi13978-3064219-2274219-22717877(Top 67%)6788(Top 59%)6788(Top 139%)
24M24.00 mi1.00 mi14426-4484512-2934512-29320825(Top 78%)8441(Top 74%)8441(Top 173%)
40K24.85 mi0.85 mi14697-2714700-1884700-18819956(Top 75%)8032(Top 70%)8032(Top 164%)
25.2M25.20 mi0.35 mi14973-2764874-1744874-17423385(Top 88%)9867(Top 86%)9867(Top 202%)
Finish26.22 mi1.02 mi15211-2385029-1555029-15519781(Top 74%)7876(Top 69%)7876(Top 161%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 48%
×21story building
+97ft-345ft

Overall

12713

Females

3302

F18-39

3302

5K→10K

3.1 - 6.2 mi

Top 46%
×5story building
+79ft-138ft

Overall

12142

Females

2955

F18-39

2955

10K→15K

6.2 - 9.3 mi

Top 48%
×3story building
+67ft-78ft

Overall

12713

Females

3302

F18-39

3302

15K→20K

9.3 - 12.4 mi

Top 51%
×5story building
+106ft-86ft

Overall

13673

Females

3923

F18-39

3923

20K→Half

12.4 - 13.1 mi

Top 49%
×2story building
+19ft-37ft

Overall

12984

Females

3513

F18-39

3513

Half→25K

13.1 - 15.5 mi

Top 52%
×4story building
+66ft-88ft

Overall

13819

Females

4112

F18-39

4112

25K→30K

15.5 - 18.6 mi

Top 58%
×9story building
+181ft-148ft

Overall

15361

Females

5147

F18-39

5147

30K→20M

18.6 - 20.0 mi

Top 59%
×5story building
+64ft-50ft

Overall

15677

Females

5376

F18-39

5376

20M→21M

20.0 - 21.0 mi

Top 63%
×8story building
+106ft-24ft

Overall

16784

Females

6060

F18-39

6060

21M→35K

21.0 - 21.8 mi

Top 54%
×7story building
+17ft-86ft

Overall

14329

Females

4746

F18-39

4746

35K→23M

21.8 - 23.0 mi

Top 67%
×5story building
+23ft-63ft

Overall

17877

Females

6788

F18-39

6788

23M→24M

23.0 - 24.0 mi

Top 78%
×6story building
+12ft-82ft

Overall

20825

Females

8441

F18-39

8441

24M→40K

24.0 - 24.9 mi

Top 75%
×1story
+6ft-20ft

Overall

19956

Females

8032

F18-39

8032

40K→25.2M

24.9 - 25.2 mi

Top 88%
×1story
+13ft-16ft

Overall

23385

Females

9867

F18-39

9867

25.2M→Finish

25.2 - 26.2 mi

Top 74%
×2story building
+22ft-21ft

Overall

19781

Females

7876

F18-39

7876

Passing Analysis

Category:
Athletes Passed
713
Passed By
4524
Net Change
-3811
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11400
5K → 10K185499-314#11400#11714
10K → 15K102402-300#11714#12014
15K → 20K64458-394#12014#12408
20K → Half3146-15#12408#12423
Half → 25K72290-218#12423#12641
25K → 30K68646-578#12641#13219
30K → 20M44236-192#13219#13411
20M → 21M33283-250#13411#13661
21M → 35K4152-11#13661#13672
35K → 23M30336-306#13672#13978
23M → 24M13461-448#13978#14426
24M → 40K15286-271#14426#14697
40K → 25.2M3279-276#14697#14973
25.2M → Finish12250-238#14973#15211
TOTALS7134524-3811
📊

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