Swim Pace Calculator
Convert swim distance, time and pace for 25m, 50m and yard pools. Build 100/200/400/1500 split tables and estimate critical swim speed (CSS) from two timed efforts.
Wakayoshi 1993 protocol: two maximal efforts in the same course, with full recovery.
Same-speed equivalents (does not predict race results; turn counts differ)
| Distance | Split time | Pool lengths |
|---|
Run pace: Pace calculator | race prediction: Race time predictor | energy estimate: Calories burned.
How to use
Choose SCM, LCM, SCY, or a custom pool; then calculate pace from time, time from pace, or CSS from the same-course 400/200 protocol. Course conversion values preserve speed only and do not predict race performance.
Swim Pace Calculator helps athletes and everyday trainees get a clear, actionable number they can use in the gym, on the road or in the pool — without uploading any data. All calculations run locally in your browser.
Use the presets to learn the expected inputs, then adjust for your own session. Export or share the result when you want a training log or a quick plan for your next workout.
FAQ
Is my data uploaded?
No. Inputs stay in your browser. Optional session history uses localStorage on this device only.
Is this medical or coaching advice?
No. It is a free educational calculator. Consult a qualified coach or clinician for personalised programmes, especially if you have injuries or health conditions.
Can I share or export the result?
Yes. Most pages support copy, CSV download and a shareable result image so you can keep a log or send the plan to a training partner.
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