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BOSTON MARATHON 2023

David Calfee

Bib: 12753•M

NY

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 32%
Gender (Male)
#0 / 15176
Top 46%
Masters (Masters Men)
#0 / 9891
Top 34%
Division (M50-54)
#0 / 2052
Top 30%
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
7:32/mi
23:25
↑ 97↓ 3451.5%
10K· 6.21 mi
7:25/mi
46:28
↑ 79↓ 1380.4%
15K· 9.32 mi
7:26/mi
1:09:33
↑ 67↓ 78
20K· 12.43 mi
7:31/mi
1:32:54
↑ 106↓ 860.1%
Half· 13.11 mi
7:29/mi
1:38:00
↑ 19↓ 370.5%
25K· 15.53 mi
7:32/mi
1:56:16
↑ 66↓ 880.2%
30K· 18.64 mi
7:39/mi
2:20:03
↑ 181↓ 1480.2%
20M
7:38/mi
2:30:26
↑ 64↓ 500.2%
21M
7:51/mi
2:38:17
↑ 106↓ 241.6%
35K· 21.75 mi
7:24/mi
2:43:49
↑ 17↓ 861.7%
23M
7:40/mi
2:53:25
↑ 23↓ 630.6%
24M
7:27/mi
3:00:52
↓ 821.3%
40K· 24.85 mi
7:29/mi
3:07:16
↓ 200.3%
25.2M
8:04/mi
3:10:03
↑ 13↓ 160.2%
Finish· 26.22 mi
7:09/mi
3:17:20
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:38:00
Pace7:29 /mi
2nd Half
Distance13.11 mi
Time1:39:20
Pace7:35 /mi
📊Positive Split: 1.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:0223:257:3223:25
7:32
-
10K
6.21 mi11:15:0546:287:2923:03
7:25
-0:07
15K
9.32 mi11:38:101:09:337:2823:05
7:26
+0:01
20K
12.43 mi12:01:311:32:547:2923:21
7:31
+0:05
Half
13.11 mi12:06:371:38:007:295:06
7:29
-0:02
25K
15.53 mi12:24:531:56:167:2918:16
7:32
+0:03
30K
18.64 mi12:48:402:20:037:3123:47
7:39
+0:07
20M
20.00 mi12:59:032:30:267:3110:23
7:38
-0:01
21M
21.00 mi13:06:542:38:177:327:51
7:51
+0:13
35K
21.75 mi13:12:262:43:497:325:32
7:24
-0:27
23M
23.00 mi13:22:022:53:257:329:36
7:40
+0:16
24M
24.00 mi13:29:293:00:527:327:27
7:27
-0:13
40K
24.85 mi13:35:533:07:167:326:24
7:29
+0:02
25.2M
25.20 mi13:38:403:10:037:332:47
8:04
+0:35
Finish
26.22 mi13:45:573:17:207:327:17
7:09
-0:55

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

7:09 /mi

Average Pace

7:32 /mi

Slowest Pace

8:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:14:33

99% of race

Time at Steady Pace

2:47

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:32 /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 mi10:52:0223:257:3223:25
7:32
#9942
10K
6.21 mi11:15:0546:287:2923:03
7:25
#9809
15K
9.32 mi11:38:101:09:337:2823:05
7:26
#9697
20K
12.43 mi12:01:311:32:547:2923:21
7:31
#9611
Half
13.11 mi12:06:371:38:007:295:06
7:29
#9621
25K
15.53 mi12:24:531:56:167:2918:16
7:32
#9507
30K
18.64 mi12:48:402:20:037:3123:47
7:39
#9254
20M
20.00 mi12:59:032:30:267:3110:23
7:38
#9116
21M
21.00 mi13:06:542:38:177:327:51
7:51
#8942
35K
21.75 mi13:12:262:43:497:325:32
7:24
#8877
23M
23.00 mi13:22:022:53:257:329:36
7:40
#8781
24M
24.00 mi13:29:293:00:527:327:27
7:27
#8691
40K
24.85 mi13:35:533:07:167:326:24
7:29
#8585
25.2M
25.20 mi13:38:403:10:037:332:47
8:04
#8540
Finish
26.22 mi13:45:573:17:207:327:17
7:09
#8401
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi9942809480949585(Top 36%)7912(Top 52%)7912(Top 386%)
10K6.21 mi3.10 mi9809+1338048+468048+469785(Top 37%)8047(Top 53%)8047(Top 392%)
15K9.32 mi3.11 mi9697+1127974+747974+749585(Top 36%)7912(Top 52%)7912(Top 386%)
20K12.43 mi3.11 mi9611+867926+487926+489423(Top 35%)7749(Top 51%)7749(Top 378%)
Half13.11 mi0.68 mi9621-107936-107936-109939(Top 37%)8049(Top 53%)8049(Top 392%)
25K15.53 mi2.42 mi9507+1147844+927844+929010(Top 34%)7439(Top 49%)7439(Top 363%)
30K18.64 mi3.11 mi9254+2537656+1887656+1888324(Top 31%)6876(Top 45%)6876(Top 335%)
20M20.00 mi1.36 mi9116+1387549+1077549+1077759(Top 29%)6444(Top 42%)6444(Top 314%)
21M21.00 mi1.00 mi8942+1747428+1217428+1216452(Top 24%)5524(Top 36%)5524(Top 269%)
35K21.75 mi0.75 mi8877+657378+507378+507757(Top 29%)6353(Top 42%)6353(Top 310%)
23M23.00 mi1.25 mi8781+967290+887290+887538(Top 28%)6147(Top 41%)6147(Top 300%)
24M24.00 mi1.00 mi8691+907213+777213+777366(Top 28%)5936(Top 39%)5936(Top 289%)
40K24.85 mi0.85 mi8585+1067133+807133+806629(Top 25%)5417(Top 36%)5417(Top 264%)
25.2M25.20 mi0.35 mi8540+457098+357098+356894(Top 26%)5526(Top 36%)5526(Top 269%)
Finish26.22 mi1.02 mi8401+1396986+1126986+1126097(Top 23%)5004(Top 33%)5004(Top 244%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 36%
×21story building
+97ft-345ft

Overall

9585

Males

7912

M50-54

7912

5K→10K

3.1 - 6.2 mi

Top 37%
×5story building
+79ft-138ft

Overall

9785

Males

8047

M50-54

8047

10K→15K

6.2 - 9.3 mi

Top 36%
×3story building
+67ft-78ft

Overall

9585

Males

7912

M50-54

7912

15K→20K

9.3 - 12.4 mi

Top 35%
×5story building
+106ft-86ft

Overall

9423

Males

7749

M50-54

7749

20K→Half

12.4 - 13.1 mi

Top 37%
×2story building
+19ft-37ft

Overall

9939

Males

8049

M50-54

8049

Half→25K

13.1 - 15.5 mi

Top 34%
×4story building
+66ft-88ft

Overall

9010

Males

7439

M50-54

7439

25K→30K

15.5 - 18.6 mi

Top 31%
×9story building
+181ft-148ft

Overall

8324

Males

6876

M50-54

6876

30K→20M

18.6 - 20.0 mi

Top 29%
×5story building
+64ft-50ft

Overall

7759

Males

6444

M50-54

6444

20M→21M

20.0 - 21.0 mi

Top 24%
×8story building
+106ft-24ft

Overall

6452

Males

5524

M50-54

5524

21M→35K

21.0 - 21.8 mi

Top 29%
×7story building
+17ft-86ft

Overall

7757

Males

6353

M50-54

6353

35K→23M

21.8 - 23.0 mi

Top 28%
×5story building
+23ft-63ft

Overall

7538

Males

6147

M50-54

6147

23M→24M

23.0 - 24.0 mi

Top 28%
×6story building
+12ft-82ft

Overall

7366

Males

5936

M50-54

5936

24M→40K

24.0 - 24.9 mi

Top 25%
×1story
+6ft-20ft

Overall

6629

Males

5417

M50-54

5417

40K→25.2M

24.9 - 25.2 mi

Top 26%
×1story
+13ft-16ft

Overall

6894

Males

5526

M50-54

5526

25.2M→Finish

25.2 - 26.2 mi

Top 23%
×2story building
+22ft-21ft

Overall

6097

Males

5004

M50-54

5004

Passing Analysis

Category:
Athletes Passed
2279*
Passed By
738
Net Change
+1541
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#9942
5K → 10K388255+133#9942#9809
10K → 15K229117+112#9809#9697
15K → 20K189103+86#9697#9611
20K → Half1929-10#9611#9621
Half → 25K17662+114#9621#9507
25K → 30K309*56+253#9507#9254
30K → 20M15416+138#9254#9116
20M → 21M18410+174#9116#8942
21M → 35K7813+65#8942#8877
35K → 23M12125+96#8877#8781
23M → 24M10818+90#8781#8691
24M → 40K11711+106#8691#8585
40K → 25.2M5510+45#8585#8540
25.2M → Finish15213+139#8540#8401
TOTALS2279*738+1541

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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