Calculate swimming pace per hundred metres and project longer distances.
Swimming pace is quoted per hundred metres because pool lengths make it the natural unit. Projecting to longer distances at the same pace is optimistic, since technique degrades with fatigue more sharply than in running. Open water adds roughly five to ten seconds per hundred metres against pool pace because of navigation and lack of push-offs.
Swimming Pace
Pace per 100 m = total seconds × 100 ÷ distance in metres
These figures are estimates based on population-average formulas and are intended for training and recreational planning only. They are not medical advice. Consult a qualified health professional before starting or changing an exercise programme, particularly if you have an existing medical condition.
Pace per 100 m = total seconds × 100 ÷ distance in metres Swimming pace is quoted per hundred metres because pool lengths make it the natural unit. Projecting to longer distances at the same pace is optimistic, since technique degrades with fatigue more sharply than in running.
Open water adds roughly five to ten seconds per hundred metres against pool pace because of navigation and lack of push-offs.
This calculator takes 4 inputs: Distance swum, Time taken, Additional seconds, Distance to project. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.