Running PBs

Log finish times for each distance. When you have PBs at more than one distance, FitLog projects equivalent times and stretch goals from your strongest efforts.

1 mile· 6:17 5K· 20:55 10K· 0:43 Half marathon· 1:44:30 Marathon 1/2 Mile· 3:01 + Distance

What your PBs imply

Using Riegel’s formula from your fastest efforts across distances. If one PB is much stronger than another, you’ll see a stretch goal here.

Half marathon could be faster · 1:42:54 off fitness
A goal
1:36
B goal
1:39
Current PB
1:44:30
Based on your 10K PB (0:43) · goal pace 0:05/km
1 mile could be faster · 6:11 off fitness
A goal
0:06
B goal
0:06
Current PB
6:17
Based on your 10K PB (0:43) · goal pace 0:04/km
1/2 Mile could be faster · 2:58 off fitness
A goal
0:03
B goal
0:03
Current PB
3:01
Based on your 10K PB (0:43) · goal pace 0:04/km
5K could be faster · 20:34 off fitness
A goal
0:21
B goal
0:22
Current PB
20:55
Based on your 10K PB (0:43) · goal pace 0:04/km
Marathon — no PB yet
Aim for 3:20
Equivalent to your 10K PB of 0:43 · 0:05/km

All equivalent times

1 mileequiv. 0:06(PB 6:17 · room to improve)from 10K
5Kequiv. 0:21(PB 20:55 · room to improve)from 10K
10Kequiv. 43:34(PB 0:43 · stronger than curve)from 1 mile
Half marathonequiv. 1:36(PB 1:44:30 · room to improve)from 10K
Marathonequiv. 3:20(no PB yet)from 10K
1/2 Mileequiv. 0:03(PB 3:01 · room to improve)from 10K

Current PB · Half marathon

1:44:30

4:57/km · Sun, Sep 7, 2025 · 4 attempts

Stretch goal from your other PBs

1:36

B goal 1:39

Your 10K PB (0:43) projects 1:36 here (0:05/km). Current PB is 1:42:54 slower than that fitness.

Timeline

Newest first. Green means faster than your previous attempt.

1:44:30
Sun, Sep 7, 2025 · 4:57/km
Kenilworth Half
PB−9:22 vs last
1:53:52
Sun, May 25, 2025 · 5:24/km
Edinburgh Half
+9:22 vs PB−28:27 vs last
2:22:19
Sat, Mar 15, 2025 · 6:45/km
+37:49 vs PB−4:15 vs last
2:26:34
Sat, Mar 8, 2025 · 6:57/km
+42:04 vs PBFirst

Running PBs

Log a run

Timeline