Boston Marathon logo
BOSTON MARATHON 2023

Samir Kafel

Bib: 24750•M

MA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 50%
Gender (Male)
#0 / 15176
Division (M18-39)
#0 / 5285
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
8:45/mi
27:10
↑ 97↓ 3451.5%
10K· 6.21 mi
8:01/mi
52:04
↑ 79↓ 1380.4%
15K· 9.32 mi
8:01/mi
1:16:59
↑ 67↓ 78
20K· 12.43 mi
8:04/mi
1:42:02
↑ 106↓ 860.1%
Half· 13.11 mi
7:59/mi
1:47:29
↑ 19↓ 370.5%
25K· 15.53 mi
8:03/mi
2:07:01
↑ 66↓ 880.2%
30K· 18.64 mi
8:07/mi
2:32:14
↑ 181↓ 1480.2%
20M
8:15/mi
2:43:26
↑ 64↓ 500.2%
21M
8:18/mi
2:51:44
↑ 106↓ 241.6%
35K· 21.75 mi
8:15/mi
2:57:54
↑ 17↓ 861.7%
23M
8:00/mi
3:07:55
↑ 23↓ 630.6%
24M
7:52/mi
3:15:47
↓ 821.3%
40K· 24.85 mi
8:01/mi
3:22:38
↓ 200.3%
25.2M
8:59/mi
3:25:44
↑ 13↓ 160.2%
Finish· 26.22 mi
7:41/mi
3:33:34
↑ 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 Half
Distance13.11 mi
Time1:47:29
Pace8:12 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:46:05
Pace8:06 /mi
📊Negative Split: 1.3% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:49:4927:108:4527:10
8:45
-
10K
6.21 mi12:14:4352:048:2324:54
8:01
-0:44
15K
9.32 mi12:39:381:16:598:1624:55
8:01
0:00
20K
12.43 mi13:04:411:42:028:1325:03
8:04
+0:03
Half
13.11 mi13:10:081:47:298:125:27
7:59
-0:05
25K
15.53 mi13:29:402:07:018:1119:32
8:03
+0:04
30K
18.64 mi13:54:532:32:148:1025:13
8:07
+0:04
20M
20.00 mi14:06:052:43:268:1011:12
8:15
+0:08
21M
21.00 mi14:14:232:51:448:118:18
8:18
+0:03
35K
21.75 mi14:20:332:57:548:116:10
8:15
-0:03
23M
23.00 mi14:30:343:07:558:1010:01
8:00
-0:15
24M
24.00 mi14:38:263:15:478:097:52
7:52
-0:08
40K
24.85 mi14:45:173:22:388:096:51
8:01
+0:09
25.2M
25.20 mi14:48:233:25:448:103:06
8:59
+0:58
Finish
26.22 mi14:56:133:33:348:097:50
7:41
-1:18

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

8:09 /mi

Slowest Pace

8:59 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:03:18

86% of race

Time at Steady Pace

30:16

14% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:09 /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 mi11:49:4927:108:4527:10
8:45
#19131
10K
6.21 mi12:14:4352:048:2324:54
8:01
#17046
15K
9.32 mi12:39:381:16:598:1624:55
8:01
#16237
20K
12.43 mi13:04:411:42:028:1325:03
8:04
#15641
Half
13.11 mi13:10:081:47:298:125:27
7:59
#15574
25K
15.53 mi13:29:402:07:018:1119:32
8:03
#15176
30K
18.64 mi13:54:532:32:148:1025:13
8:07
#14563
20M
20.00 mi14:06:052:43:268:1011:12
8:15
#14341
21M
21.00 mi14:14:232:51:448:118:18
8:18
#14046
35K
21.75 mi14:20:332:57:548:116:10
8:15
#14013
23M
23.00 mi14:30:343:07:558:1010:01
8:00
#13744
24M
24.00 mi14:38:263:15:478:097:52
7:52
#13556
40K
24.85 mi14:45:173:22:388:096:51
8:01
#13395
25.2M
25.20 mi14:48:233:25:448:103:06
8:59
#13360
Finish
26.22 mi14:56:133:33:348:097:50
7:41
#13209
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi19131118261182614526(Top 55%)10107(Top 67%)10107(Top 191%)
10K6.21 mi3.10 mi17046+208511080+74611080+74614899(Top 56%)10268(Top 68%)10268(Top 194%)
15K9.32 mi3.11 mi16237+80910786+29410786+29414526(Top 55%)10107(Top 67%)10107(Top 191%)
20K12.43 mi3.11 mi15641+59610541+24510541+24513930(Top 52%)9843(Top 65%)9843(Top 186%)
Half13.11 mi0.68 mi15574+6710509+3210509+3214203(Top 53%)9975(Top 66%)9975(Top 189%)
25K15.53 mi2.42 mi15176+39810333+17610333+17613184(Top 50%)9431(Top 62%)9431(Top 178%)
30K18.64 mi3.11 mi14563+61310061+27210061+27211764(Top 44%)8705(Top 57%)8705(Top 165%)
20M20.00 mi1.36 mi14341+2229938+1239938+12311953(Top 45%)8693(Top 57%)8693(Top 164%)
21M21.00 mi1.00 mi14046+2959816+1229816+1229237(Top 35%)7209(Top 48%)7209(Top 136%)
35K21.75 mi0.75 mi14013+339786+309786+3013707(Top 51%)9280(Top 61%)9280(Top 176%)
23M23.00 mi1.25 mi13744+2699656+1309656+1309737(Top 37%)7360(Top 48%)7360(Top 139%)
24M24.00 mi1.00 mi13556+1889566+909566+9010277(Top 39%)7550(Top 50%)7550(Top 143%)
40K24.85 mi0.85 mi13395+1619479+879479+8710129(Top 38%)7410(Top 49%)7410(Top 140%)
25.2M25.20 mi0.35 mi13360+359454+259454+2512412(Top 47%)8475(Top 56%)8475(Top 160%)
Finish26.22 mi1.02 mi13209+1519370+849370+849885(Top 37%)7230(Top 48%)7230(Top 137%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 55%
×21story building
+97ft-345ft

Overall

14526

Males

10107

M18-39

10107

5K→10K

3.1 - 6.2 mi

Top 56%
×5story building
+79ft-138ft

Overall

14899

Males

10268

M18-39

10268

10K→15K

6.2 - 9.3 mi

Top 55%
×3story building
+67ft-78ft

Overall

14526

Males

10107

M18-39

10107

15K→20K

9.3 - 12.4 mi

Top 52%
×5story building
+106ft-86ft

Overall

13930

Males

9843

M18-39

9843

20K→Half

12.4 - 13.1 mi

Top 53%
×2story building
+19ft-37ft

Overall

14203

Males

9975

M18-39

9975

Half→25K

13.1 - 15.5 mi

Top 50%
×4story building
+66ft-88ft

Overall

13184

Males

9431

M18-39

9431

25K→30K

15.5 - 18.6 mi

Top 44%
×9story building
+181ft-148ft

Overall

11764

Males

8705

M18-39

8705

30K→20M

18.6 - 20.0 mi

Top 45%
×5story building
+64ft-50ft

Overall

11953

Males

8693

M18-39

8693

20M→21M

20.0 - 21.0 mi

Top 35%
×8story building
+106ft-24ft

Overall

9237

Males

7209

M18-39

7209

21M→35K

21.0 - 21.8 mi

Top 51%
×7story building
+17ft-86ft

Overall

13707

Males

9280

M18-39

9280

35K→23M

21.8 - 23.0 mi

Top 37%
×5story building
+23ft-63ft

Overall

9737

Males

7360

M18-39

7360

23M→24M

23.0 - 24.0 mi

Top 39%
×6story building
+12ft-82ft

Overall

10277

Males

7550

M18-39

7550

24M→40K

24.0 - 24.9 mi

Top 38%
×1story
+6ft-20ft

Overall

10129

Males

7410

M18-39

7410

40K→25.2M

24.9 - 25.2 mi

Top 47%
×1story
+13ft-16ft

Overall

12412

Males

8475

M18-39

8475

25.2M→Finish

25.2 - 26.2 mi

Top 37%
×2story building
+22ft-21ft

Overall

9885

Males

7230

M18-39

7230

Passing Analysis

Category:
Athletes Passed
6092
Passed By
170
Net Change
+5922
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19131
5K → 10K210520+2085#19131#17046
10K → 15K83930+809#17046#16237
15K → 20K60711+596#16237#15641
20K → Half747+67#15641#15574
Half → 25K4079+398#15574#15176
25K → 30K6196+613#15176#14563
30K → 20M23311+222#14563#14341
20M → 21M2994+295#14341#14046
21M → 35K5825+33#14046#14013
35K → 23M2723+269#14013#13744
23M → 24M1946+188#13744#13556
24M → 40K1665+161#13556#13395
40K → 25.2M4914+35#13395#13360
25.2M → Finish17019+151#13360#13209
TOTALS6092170+5922
📊

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