Free running calculators

The same maths the Outrunr app runs, on the open web. No sign-up, no limits, nothing stored.

parkrun time calculator Your age-graded percentile, your equivalent race times, and the five paces you should be training at. Goal time reality check How likely your target time actually is, how many weeks you really need, and a stepping stone if it is too far. Shoe replacement calculator Foam chemistry, not a flat 500 km. Find out how long your shoes really last and when to order the next pair.

Why these are free

Outrunr is a training app. These calculators run the same maths the app runs — the same Daniels & Gilbert VDOT model, the same age-grading tables, the same foam-life policy — so what you see here is what the app would tell you.

Nothing is stored. The numbers are worked out in your browser and go nowhere. There is no sign-up, no paywall and no limit on how many times you use them.

What the app adds is everything a single calculation cannot do: a plan that adapts week to week, coaching in your ear while you run, and a record of what actually changed.

Built by a running app.

Outrunr turns these numbers into a plan that adapts every week, and coaches you through every session. Beta is opening soon.

Beta access when it opens. No spam, and you can leave any time.

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