What pace do I need for a 1:20 10-mile race?

A 1:20 10-mile race is 4:58/km (8:00/mi), 12.1 km/h, held for the whole race.

What treadmill speed is 1:20 10 mile pace?

Set the treadmill to 12.1 km/h or 7.5 mph to run 4:58/km (8:00/mi).

Where should I be at halfway in a 1:20 10-mile race?

With even pacing you pass halfway in 40:00; with a negative split, a little later.

What does a 1:20 10-mile race predict for other distances?

The Riegel formula estimates 23:10 for the 5K, 48:19 for the 10K, 1:46:36 for the half marathon, 3:42:14 for the marathon, assuming you’ve trained for each distance.

1:20 10 mile pace

A 1:20 10-mile race is 4:58/km (8:00/mi), 12.1 km/h.

10 miles finish times around your target, in 30 seconds steps
Change	Time	Pace
−2:00	1:18:00	4:517:48
−1:30	1:18:30	4:537:51
−1:00	1:19:00	4:557:54
−0:30	1:19:30	4:567:57
Your target Finish time Pace /km
+0:30	1:20:30	5:008:03
+1:00	1:21:00	5:028:06
+1:30	1:21:30	5:048:09
+2:00	1:22:00	5:068:12

min/kmmin/mikm/hmph

Arrow keys nudge the value. Hold Shift for bigger steps.

Finish times at 4:58 per km

Finish time at this pace for each distance
Distance	Finish time
1K	4:58
1 mile	8:00
5K	24:51
10K	49:43
10 miles	1:20:00
Half marathon	1:44:53
Marathon	3:29:45
50K	4:08:33

Splits for a 1:20 10-mile race

Negative splitEven pace all the way

Splits per km
km	Split	Elapsed
1	4:58	4:58
2	4:58	9:57
3	4:58	14:55
4	4:58	19:53
5	4:58	24:51
6	4:58	29:50
7	4:58	34:48
8	4:58	39:46
9	4:58	44:44
10	4:58	49:43
11	4:58	54:41
12	4:58	59:39
13	4:58	1:04:37
14	4:58	1:09:36
15	4:58	1:14:34
16	4:58	1:19:32
Final 0.093 km	0:28	1:20:00

Splits per mile
Mile	Split	Elapsed
1	8:00	8:00
2	8:00	16:00
3	8:00	24:00
4	8:00	32:00
5	8:00	40:00
6	8:00	48:00
7	8:00	56:00
8	8:00	1:04:00
9	8:00	1:12:00
10	8:00	1:20:00

What a 1:20 10-mile race predicts

Estimate

Estimated times at other distances (Riegel formula)
Distance	Estimated time
5K	23:10
10K	48:19
Half marathon	1:46:36
Marathon	3:42:14

These are estimates from the Riegel formula, T2 = T1 × (D2 ÷ D1)^1.06. They assume you’ve trained for the other distance, so treat them as a guide, not a promise.

From 1:15 to 1:30, plan one gel

You’ll be out for more than an hour and a quarter. A gel or sports drink around halfway helps the last miles; try it in training first.

One goal-pace session and one longer easy run each week cover most of the work.

Pace questions runners ask

What pace do I need for a 1:20 10-mile race?: A 1:20 10-mile race is 4:58/km (8:00/mi), 12.1 km/h, held for the whole race.
What treadmill speed is 1:20 10 mile pace?: Set the treadmill to 12.1 km/h or 7.5 mph to run 4:58/km (8:00/mi).
Where should I be at halfway in a 1:20 10-mile race?: With even pacing you pass halfway in 40:00; with a negative split, a little later.
What does a 1:20 10-mile race predict for other distances?: The Riegel formula estimates 23:10 for the 5K, 48:19 for the 10K, 1:46:36 for the half marathon, 3:42:14 for the marathon, assuming you’ve trained for each distance.