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Pool to Open Water Estimator
Estimate your open-water time from your pool pace. This is an adjustable estimate, not an exact formula — tune the assumptions to your own swimming.
mm:ss
Estimated open-water time—
Estimated pace · per 100—
Pool time—
Estimate only: lost push-offs (~0.7s per turn), sighting and wetsuit buoyancy. Calibrate against your own race data.
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How it's estimated
There is no exact formula for pool-to-open-water. This model starts from your pool time, then adds back the push-off advantage you lose without walls (more turns in a short pool means more lost time), adds a sighting penalty for navigating, and subtracts a wetsuit benefit from added buoyancy. The defaults are reasonable starting points; adjust them until the model matches a swim you have actually done in both settings.