Zerdly

Swimrun Calculator

Calculates total time across alternating swim and run legs of a swimrun.

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How to use this calculator

Swimrun legs

m
:/100 m
km
:/km
m
:/100 m
km
:/km

Result

Add legs with a distance and a pace/speed to see your total time.

Estimate only — real results depend on terrain, weather, fatigue, transitions and conditions. Not medical or coaching advice.

Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.

How to use this calculator

  1. Add each swim and run leg with its distance and pace.
  2. Read the total time and per-leg splits.

How it works

Each leg is timed from its distance and pace; swimrun alternates many swim and run legs. The total is the sum of every leg.

Worked example

Swimrun. Alternating ~300 m swims and ~1.7 km runs, summed into one finish time.

Common mistakes

  • Forgetting transitions — swimrun has many swim-to-run changes that add up over a race.
  • Using flat-water swim pace for cold, wetsuit, tethered open-water legs.

Tips

  • Times are estimates only — not medical or coaching advice. Always train safely and follow event rules.
  • Distances are editable: choose “Custom…” to enter your own course lengths.

Frequently asked questions

What is swimrun?

A race format, popularised by ÖTILLÖ, of alternating open-water swims and trail runs done in the same kit without changing between legs.

How do I estimate a swimrun time?

Add your estimated time for each swim and run leg plus transitions; the tool totals the legs so you can plan pacing and cut-offs.

Can I add as many legs as I want?

Yes — add or remove legs freely; each can be swim, run or any other type.

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Cite this tool

Zerdly. (2026). Swimrun Calculator. Retrieved from https://www.zerdly.com/tools/swimrun-calculator/

Tip: Enter any known values to calculate the remaining results.

All calculations run in your browser. Your inputs are never saved or transmitted.