Zerdly

Aquathlon Calculator

Estimates aquathlon finish time and swim-run splits from target paces.

100% FreeRuns in your browserBasic
How to use this calculator

Templates are illustrative distances you can edit, not event regulations.

Swim500 m
:
T1
:
Run2.5 km
:

Result

Enter a pace or speed for each leg to see your finish time and splits.

Constant average pace for each leg: no drafting, gradient or fatigue model. Estimate only — real results depend on course, weather, terrain, fatigue, transitions, equipment, nutrition and event rules. Not medical or coaching advice.

How the method works

Swim → transition → run plan
Illustrative method
Swim → transition → run planProportional time bar of a 500 m swim, a 90 second transition and a 2.5 km run, with each leg's time and the cumulative clock.Start 0:00Finish 24:0012310:001Swim · 500 m @ 2:00 /100 m10:002Transition1:303Run · 2.5 km @ 5:00 /km12:30Total (sum of every leg and transition)24:00
Swim 10:00 + Transition 1:30 + Run 12:30 = 24:00 total.

Run-swim-run formats add a second run and a second transition; only the legs in the chosen format are summed. Fixed example values for illustration — not your result.

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. Pick Sprint (swim + run) or Standard (run + swim + run), and tick Edit distances to change any leg.
  2. Choose Metric or Imperial, then enter swim pace (per 100 m or 100 yd), each run pace (per km or mile) and the transitions (blank uses the default).
  3. Read the total and splits, or solve one leg with Target Finish. Switching format keeps the values of legs it hides, and tells you which. Print race card gives a one-page plan with a blank column for actual splits.

How it works

Each leg is distance ÷ pace basis × pace; only the legs and transitions in the chosen format are added, once each.

Run 1 and Run 2 have their own paces, so a slower second run is entered, not assumed.

Target Finish solves exactly one leg from the time left after the others; a target shorter than the fixed legs is reported as impossible.

Worked example

Sprint aquathlon. 500 m swim @ 2:00/100 m (10:00) + transition 1:30 + 2.5 km run @ 5:00/km (12:30) = 24:00.

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 are typical aquathlon distances?

Often a 0.5–1 km swim with a 2.5 km run (sprint), or a run–swim–run format at standard distance. Events vary, so all distances are editable.

How accurate are these times?

They're estimates. Real race times depend on terrain, weather, elevation, fatigue, transitions, nutrition, equipment, drafting and water conditions. Use them for planning and pacing, not as a guarantee.

Do my inputs get uploaded?

No. Everything is calculated in your browser — nothing is sent to a server or stored.

What is Target Finish mode?

Enter a goal finish time and the paces/speeds for the other legs, then pick the leg to ‘solve for’. The calculator works out the pace or speed you'd need on that leg to hit your goal.

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Cite this tool

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

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

Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.