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Running calculator

Pace
Converter.

Fill in any one value. All others update instantly. Enter the unit you use and see every conversion, plus projected finish times for every major race distance.

Min / km
e.g. 5:30  →  5 min 30 sec per km
Min / mile
e.g. 8:51  →  8 min 51 sec per mile
km / h   (treadmill)
e.g. 10.9  →  10.9 km/h on treadmill
Miles / h
e.g. 6.8  →  6.8 mph on treadmill
Projected finish times
400 m lap
One lap on a standard track
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5K
5 kilometres
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10K
10 kilometres
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Half marathon
21.0975 km
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Marathon
42.195 km
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Finish times assume even pacing at the entered pace for the full distance. Real races include fatigue, terrain, and pacing variation.

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The Run Mastery app showing today's session

Coaching

Know your pace.
Now train to it.

The app builds the aerobic base and threshold work that closes the gap between where you run now and your target pace, week by week. Free account to see your plan.

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Related tools and guides

Z2
Zone Calculator

Find your Zone 2 heart rate range from age and resting heart rate.

→
TW
The Training Week

How to distribute your sessions across the week to hit your race target.

→
Z2
Zone 2 Training

Why most of your runs should be slower than your race pace.

→
IL
The Interval Library

22 structured sessions for building the speed behind your pace targets.

→

Next steps

Keep moving.

Pick the next useful step. Build your plan, choose a distance, check the membership, or keep reading the method.

App path Build your plan → Answer three questions and preview the training week before any card. Pick a goal Training Plans → Choose 5K, 10K, half marathon, or marathon and see how the method applies. Membership Pricing → One membership: adaptive plan, method-based coach, community, and guides. Learn the method Guides → Read the free science-backed guides behind the Run Mastery system.