How do I simulate a cycling time trial?

Open this page and use the live Marathon Pacing tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.

Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.

Can I use my own numbers?

Absolutely — every input is adjustable, and with data import you can drive a cycling time trial from your own measurements.

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Marathon Pacing for a cycling time trial

Simulate a cycling time trial live in your browser. This runs the real Marathon Pacing solver — adjust the inputs, watch it respond instantly, and export the result. No install, no account.

For:Students Researchers Educators Engineers Hobbyists & Makers K-12 Students First Responders

Marathon PacingLive

hit your goal time

Controls

Presets

Target time (min)

Race pace is simply your goal time divided by the distance, but how you distribute it matters. A negative split — starting conservatively and finishing faster — is how nearly every marathon world record is run, because going out too hard burns glycogen and invites the dreaded wall. Even pacing is the safe default.

▶ Run in Python

Data Inspector

Average pace5:41/km

Speed10.6 km/h

Finish time4h 0m

Governing equation

pace = \frac{T}{d} = \frac{240 min}{42.2 km} = 5.69 min/km

Reading this result: Even pacing holds 5:41/km the whole way — the safe default, since pace is simply goal time (240 min) divided by distance (42.2 km).

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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About this simulation

The full Marathon Pacing tool models a cycling time trial with the same numerics engineers and scientists use — running entirely client-side. Change any parameter and the result updates in real time, so you can build intuition, check a design, or teach the concept without spreadsheets or installs.

More you can do with Marathon Pacing

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Other ways to simulate a cycling time trial

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Frequently asked questions

How do I simulate a cycling time trial?: Open this page and use the live Marathon Pacing tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.
Is it free?: Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.
Can I use my own numbers?: Absolutely — every input is adjustable, and with data import you can drive a cycling time trial from your own measurements.