Running pace converter for min/km and min/mile
Type a pace once. Read it in both units, as speed, and as a finish time for every standard race distance.
Free. The Lock Screen unlock is $1.99, once.
Convert running pace between min/km and min/mile
Enter a pace on the minute and second scrubber and the other unit appears underneath as you move. Type 5:15 per kilometre and Milemark shows 8:27 per mile. There is no convert button and no second screen, because the conversion is the app.
The maths uses the exact international mile, 1.609344 kilometres. Rounding a mile to 1.6 sounds close enough until you carry the error across 42 kilometres, where it costs a marathon runner about 16 seconds.
See your pace as speed in km/h and mph
The same pace appears as two speed tiles: 11.4 km/h and 7.1 mph for that 5:15 per kilometre. Treadmill dials are marked in speed rather than pace, so this is the number you actually dial in at the gym.
Race finish times for 5K, 10K, half and marathon
Underneath the conversion sits a live finish time for each standard distance. Hold 5:15 per kilometre and you finish a 5K in 26:15, a 10K in 52:30, a half marathon in 1:50:46 and a marathon in 3:41:31. Move the pace by a second and every row moves with it.
Half marathon uses 21.0975 km and marathon uses 42.195 km, the official distances, not the rounded 21 and 42 that shave a minute off a slow marathon.
Pin your target pace to the Lock Screen
Save a pace and it sits on your Lock Screen and Home Screen as a widget, readable without unlocking the phone or opening anything. That is the one feature behind the $1.99 unlock, bought once and kept.
What Milemark deliberately does not do
There is no GPS, no run tracking, no account and no subscription. Nothing is uploaded because there is no server to upload it to. The app opens on the one screen it has and the answer is already there.
Pace guides and charts
Answers to the conversions and finish times runners look up most.
- How to convert min/km to min/mileConvert running pace from minutes per kilometre to minutes per mile. The exact formula, a full conversion chart, and why 1.6 is not close enough.
- How to convert min/mile to min/kmTurn minutes per mile into minutes per kilometre. Divide by 1.609344, plus a conversion chart from 5:00 to 13:00 per mile.
- Converting running pace to speed in km/h and mphConvert running pace to speed in km/h and mph. Divide 60 by your pace per kilometre. Includes a treadmill speed chart.
- How to pin your target running pace to the iPhone Lock ScreenAdd a target running pace widget to your iPhone Lock Screen so your goal pace is readable mid-run without unlocking the phone.
- Marathon pace chart in km and milesMarathon pace chart from 2:30 to 6:00. Every finish time with its per-kilometre and per-mile pace, plus the halfway split.
- Half marathon pace chart in km and milesHalf marathon pace chart from 1:15 to 3:00, with per-kilometre and per-mile pace for every finish time and the sub-2 target.
- 5K and 10K pace chart5K and 10K pace charts with per-kilometre and per-mile pace for every finish time, including the 25 minute 5K and sub-50 10K.
- Training in kilometres when the race is in milesHow to handle a training plan in one unit and a race in the other: convert once, mark both, and stop doing arithmetic while running.
Common questions
How do I convert min/km to min/mile?
Multiply the pace in minutes per kilometre by 1.609344. A 5:00/km pace is 5.0 × 1.609344 = 8.047 minutes, which is 8:03 per mile. Milemark does this as you type, in both directions.
How do I convert min/mile to min/km?
Divide by 1.609344 instead of multiplying. An 8:00 mile is 8 ÷ 1.609344 = 4.97 minutes, or 4:58 per kilometre. The direction is the only thing that changes.
What speed in km/h is a 5:00 min/km pace?
12.0 km/h, because speed in km/h is 60 divided by the pace in minutes per kilometre. In mph that same pace is 7.46. Treadmills are marked in speed, so this is the conversion you need at the gym.
Can I put my running pace on my iPhone Lock Screen?
Yes. Save a target pace in Milemark, then add its widget to your Lock Screen through the wallpaper editor. The pace stays visible without unlocking the phone. This needs the one-time $1.99 unlock.
What pace do I need for a 4 hour marathon?
5:41 per kilometre, or 9:09 per mile. That comes from 240 minutes divided by the official marathon distance of 42.195 km.
What pace is a sub 2 hour half marathon?
5:41 per kilometre, or 9:09 per mile, the same pace as a 4 hour marathon over half the distance. Most runners target 5:38 to give themselves a buffer for aid stations and a long course.
What pace is a 25 minute 5K?
5:00 per kilometre, or 8:03 per mile. A 30 minute 5K is 6:00 per kilometre and a sub-20 needs 3:59.
I train in kilometres but my race is in miles. What do I do?
Convert your key session paces once, write both numbers on the same line of your plan, and stop converting mid-run. Doing arithmetic at threshold effort is how runners go out too fast.
Is Milemark free?
The converter, the speed readout and the race finish times are free. Saving a target pace to your Lock Screen is a $1.99 one-time unlock. There is no subscription.
Does Milemark track my runs or need an account?
No to both. It has no GPS, no run history and no sign-in, and it sends nothing anywhere. It is a calculator that happens to be very good at one calculation.
Get Milemark
One screen, both units, every standard race distance. Free on iPhone.