Boston Marathon logo
BOSTON MARATHON 2025

Christopher Karlson

Bib: 25841•M

MA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 27%
Gender (Male)
#0 / 16105
Top 40%
Division (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken 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
6:49/mi
21:11
↑ 97↓ 3451.5%
10K· 6.21 mi
6:48/mi
42:20
↑ 79↓ 1380.4%
15K· 9.32 mi
6:46/mi
1:03:21
↑ 67↓ 78
20K· 12.43 mi
6:59/mi
1:25:03
↑ 106↓ 860.1%
Half· 13.11 mi
6:56/mi
1:29:47
↑ 19↓ 370.5%
25K· 15.53 mi
7:08/mi
1:47:05
↑ 66↓ 880.2%
30K· 18.64 mi
7:24/mi
2:10:05
↑ 181↓ 1480.2%
20M
7:37/mi
2:20:26
↑ 64↓ 500.2%
21M
8:14/mi
2:28:40
↑ 106↓ 241.6%
35K· 21.75 mi
7:21/mi
2:34:10
↑ 17↓ 861.7%
23M
7:34/mi
2:43:38
↑ 23↓ 630.6%
24M
7:51/mi
2:51:29
↓ 821.3%
40K· 24.85 mi
8:07/mi
2:58:25
↓ 200.3%
25.2M
8:36/mi
3:01:23
↑ 13↓ 160.2%
Finish· 26.22 mi
10:58/mi
3:12:34
↑ 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 HalfFaster
Distance13.11 mi
Time1:29:47
Pace6:51 /mi
2nd Half
Distance13.11 mi
Time1:42:47
Pace7:50 /mi
📊Positive Split: 14.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:36:1621:116:4921:11
6:49
-
10K
6.21 mi11:57:2542:206:4921:09
6:48
-0:01
15K
9.32 mi12:18:261:03:216:4821:01
6:46
-0:02
20K
12.43 mi12:40:081:25:036:5121:42
6:59
+0:13
Half
13.11 mi12:44:521:29:476:514:44
6:56
-0:03
25K
15.53 mi13:02:101:47:056:5417:18
7:08
+0:12
30K
18.64 mi13:25:102:10:056:5923:00
7:24
+0:16
20M
20.00 mi13:35:312:20:267:0110:21
7:37
+0:13
21M
21.00 mi13:43:452:28:407:058:14
8:14
+0:37
35K
21.75 mi13:49:152:34:107:055:30
7:21
-0:53
23M
23.00 mi13:58:432:43:387:079:28
7:34
+0:13
24M
24.00 mi14:06:342:51:297:097:51
7:51
+0:17
40K
24.85 mi14:13:302:58:257:116:56
8:07
+0:16
25.2M
25.20 mi14:16:283:01:237:122:58
8:36
+0:29
Finish
26.22 mi14:27:393:12:347:2111:11
10:58
+2:22

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

6:46 /mi

Average Pace

7:21 /mi

Slowest Pace

10:58 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:03:21

33% of race

Time at Steady Pace

1:39:54

52% of race

Time at Slower Pace

29:19

15% of race

Average Pace: 7:21 /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 mi11:36:1621:116:4921:11
6:49
#6467
10K
6.21 mi11:57:2542:206:4921:09
6:48
#6430
15K
9.32 mi12:18:261:03:216:4821:01
6:46
#6173
20K
12.43 mi12:40:081:25:036:5121:42
6:59
#6347
Half
13.11 mi12:44:521:29:476:514:44
6:56
#6405
25K
15.53 mi13:02:101:47:056:5417:18
7:08
#6524
30K
18.64 mi13:25:102:10:056:5923:00
7:24
#6526
20M
20.00 mi13:35:312:20:267:0110:21
7:37
#6519
21M
21.00 mi13:43:452:28:407:058:14
8:14
#6565
35K
21.75 mi13:49:152:34:107:055:30
7:21
#6558
23M
23.00 mi13:58:432:43:387:079:28
7:34
#6504
24M
24.00 mi14:06:342:51:297:097:51
7:51
#6588
40K
24.85 mi14:13:302:58:257:116:56
8:07
#6704
25.2M
25.20 mi14:16:283:01:237:122:58
8:36
#6727
Finish
26.22 mi14:27:393:12:347:2111:11
10:58
#7763
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi6467589358935748(Top 20%)5243(Top 33%)5243(Top 93%)
10K6.21 mi3.10 mi6430+375862+315862+316471(Top 23%)5859(Top 36%)5859(Top 104%)
15K9.32 mi3.11 mi6173+2575647+2155647+2155748(Top 20%)5243(Top 33%)5243(Top 93%)
20K12.43 mi3.11 mi6347-1745760-1135760-1136788(Top 24%)6049(Top 38%)6049(Top 107%)
Half13.11 mi0.68 mi6405-585805-455805-457149(Top 25%)6326(Top 39%)6326(Top 112%)
25K15.53 mi2.42 mi6524-1195885-805885-807189(Top 25%)6248(Top 39%)6248(Top 111%)
30K18.64 mi3.11 mi6526-25855+305855+307071(Top 25%)6022(Top 37%)6022(Top 107%)
20M20.00 mi1.36 mi6519+75821+345821+347788(Top 27%)6309(Top 39%)6309(Top 112%)
21M21.00 mi1.00 mi6565-465836-155836-158758(Top 31%)6677(Top 41%)6677(Top 118%)
35K21.75 mi0.75 mi6558+75812+245812+247535(Top 27%)6012(Top 37%)6012(Top 107%)
23M23.00 mi1.25 mi6504+545747+655747+656980(Top 25%)5575(Top 35%)5575(Top 99%)
24M24.00 mi1.00 mi6588-845784-375784-3710145(Top 36%)7226(Top 45%)7226(Top 128%)
40K24.85 mi0.85 mi6704-1165840-565840-5610877(Top 38%)7487(Top 46%)7487(Top 133%)
25.2M25.20 mi0.35 mi6727-235835+55835+59340(Top 33%)6592(Top 41%)6592(Top 117%)
Finish26.22 mi1.02 mi7763-10366482-6476482-64725311(Top 89%)14437(Top 90%)14437(Top 256%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 20%
×21story building
+97ft-345ft

Overall

5748

Males

5243

M18-39

5243

5K→10K

3.1 - 6.2 mi

Top 23%
×5story building
+79ft-138ft

Overall

6471

Males

5859

M18-39

5859

10K→15K

6.2 - 9.3 mi

Top 20%
×3story building
+67ft-78ft

Overall

5748

Males

5243

M18-39

5243

15K→20K

9.3 - 12.4 mi

Top 24%
×5story building
+106ft-86ft

Overall

6788

Males

6049

M18-39

6049

20K→Half

12.4 - 13.1 mi

Top 25%
×2story building
+19ft-37ft

Overall

7149

Males

6326

M18-39

6326

Half→25K

13.1 - 15.5 mi

Top 25%
×4story building
+66ft-88ft

Overall

7189

Males

6248

M18-39

6248

25K→30K

15.5 - 18.6 mi

Top 25%
×9story building
+181ft-148ft

Overall

7071

Males

6022

M18-39

6022

30K→20M

18.6 - 20.0 mi

Top 27%
×5story building
+64ft-50ft

Overall

7788

Males

6309

M18-39

6309

20M→21M

20.0 - 21.0 mi

Top 31%
×8story building
+106ft-24ft

Overall

8758

Males

6677

M18-39

6677

21M→35K

21.0 - 21.8 mi

Top 27%
×7story building
+17ft-86ft

Overall

7535

Males

6012

M18-39

6012

35K→23M

21.8 - 23.0 mi

Top 25%
×5story building
+23ft-63ft

Overall

6980

Males

5575

M18-39

5575

23M→24M

23.0 - 24.0 mi

Top 36%
×6story building
+12ft-82ft

Overall

10145

Males

7226

M18-39

7226

24M→40K

24.0 - 24.9 mi

Top 38%
×1story
+6ft-20ft

Overall

10877

Males

7487

M18-39

7487

40K→25.2M

24.9 - 25.2 mi

Top 33%
×1story
+13ft-16ft

Overall

9340

Males

6592

M18-39

6592

25.2M→Finish

25.2 - 26.2 mi

Top 89%
×2story building
+22ft-21ft

Overall

25311

Males

14437

M18-39

14437

Passing Analysis

Category:
Athletes Passed
1300
Passed By
2596
Net Change
-1296
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#6467
5K → 10K202165+37#6467#6430
10K → 15K30851+257#6430#6173
15K → 20K95269-174#6173#6347
20K → Half967-58#6347#6405
Half → 25K98217-119#6405#6524
25K → 30K177179-2#6524#6526
30K → 20M9285+7#6526#6519
20M → 21M5197-46#6519#6565
21M → 35K5447+7#6565#6558
35K → 23M11157+54#6558#6504
23M → 24M40124-84#6504#6588
24M → 40K32148-116#6588#6704
40K → 25.2M2952-23#6704#6727
25.2M → Finish21038-1036#6727#7763
TOTALS13002596-1296
📊

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