Swimming Pace Calculator
Swimming pace calculator — enter the distance you swam and your time to get your pace per 50, 100 and 200 metres, your speed in metres per second, and a table of even-pace splits for the whole swim. Perfect for pool training and race planning. Runs in your browser.
Swimming Pace Calculator
How to Use the Swimming Pace Calculator
Pick a distance
Choose a common distance or type a custom one in metres.
Enter your time
Add the minutes and seconds of your swim.
Read your pace
See pace per 50, 100 and 200 m, plus speed.
Plan your splits
Use the even-pace split table to pace your next swim.
Swimming in Seconds-per-Hundred
Swimmers think in a language all their own: not kilometres per hour or minutes per mile, but seconds per hundred metres. It is the unit a coach calls from the poolside, the number on every training set, and the figure that lets a sprinter and a distance swimmer compare efforts on the same scale. This calculator translates any swim into that language. Enter how far you swam and how long it took, and it returns your pace per 50, 100 and 200 metres, your raw speed in metres per second, and a table of even-pace splits for the whole distance — everything you need to understand the swim you just finished and to plan the next one.
The arithmetic is simple but the insight is not. Your pace per hundred is just your time scaled to a standard distance, yet seeing it alongside the even-pace splits reveals how you actually swam. The splits show the cumulative time you would hit at each hundred-metre mark if you held a perfectly steady rhythm; lay your real splits beside them and the story emerges. Most swimmers go out too fast, bank a few seconds early, then bleed far more than that back over the second half as fatigue sets in. The disciplined alternative — even pacing, or the prized negative split where the back half is quicker than the front — almost always yields a faster overall time, and the targets here give you a concrete plan to swim it.
A few practical notes keep the numbers honest. Pace is identical regardless of pool length, but times are not strictly comparable across courses: a 25-metre pool offers twice as many turns and push-offs per hundred as a 50-metre “long course” pool, so the same effort reads slightly faster in the short course. Open-water swims, with no walls to push off and the added work of currents, chop and sighting, are typically slower than pool pace for the same exertion. None of that changes the maths — it simply reminds you to compare like with like. As with every RECATOOLS calculator, the whole computation happens in your browser, so your training data never leaves your device.
Lay your real splits beside the even-pace targets and the truth comes out: most swimmers fade because they started too fast.
10 Facts About Swim Pace
Swim pace is almost always quoted per 100 metres.
A sub-1:30/100m pace marks a strong club swimmer.
Even pacing usually beats going out too fast.
Most lap pools are 25 m or 50 m long.
A “long course” pool is the Olympic 50 m.
Open-water races are measured in metres or miles.
Drafting behind a swimmer can save energy.
Negative splitting means swimming the second half faster.
Stroke rate × distance-per-stroke sets your speed.
This calculator runs in your browser — nothing is uploaded.
Frequently Asked Questions
- Pace is your time divided by the distance, expressed per a standard distance. This tool takes the total distance you swam and your total time, works out your speed, and converts it into pace per 50, 100 and 200 metres. The per-100-metre figure is the one swimmers quote most often.
- Per-100-metre pace is the universal currency of swimming, the way per-kilometre or per-mile pace is for running. It is short enough to be meaningful for a single fast effort yet long enough to compare across distances, so coaches, training plans and swimmers all speak in “seconds per hundred”. The tool also gives per-50 and per-200 for convenience.
- They show the cumulative time you would hit at each 100-metre mark if you held your average pace exactly even for the whole swim. Comparing your real splits against these even-pace targets tells you whether you started too fast and faded, or paced sensibly. Even or slightly negative splitting is usually the most efficient strategy.
- It depends enormously on stroke, distance and experience. As a rough freestyle guide, a pace around 2:00 per 100 m is a steady recreational effort, 1:30–1:45 is a solid club swimmer, and well under 1:20 is competitive. Sprints are far faster than distance pace, so always compare like with like.
- Your pace figure is the same regardless of pool length, but your times often are not. Shorter-course pools (25 m) give more push-offs and turns per 100 m, which usually makes times slightly faster than in a long-course (50 m) pool. So a 1:30 in a 25 m pool is not strictly equal to 1:30 long course, even though the pace maths is identical.
- Yes. Enter the total distance and your time and you will get your average pace and speed just the same. Bear in mind that open water has no walls to push off, plus currents, chop and sighting, so open-water pace is typically slower than your pool pace for the same effort.
- Negative splitting means swimming the second half of a race faster than the first. It is a popular strategy because starting controlled conserves energy and avoids the early lactate spike that comes from going out too hard. The even-pace splits in this tool give you the baseline against which a negative split can be planned.
- Put the minutes and seconds of your total swim time into the two time fields, and the distance in metres. The calculator combines them into a total time and derives everything from there. You can pick a common distance from the menu or type a custom distance for any swim.
- The pace and speed are exact arithmetic from the numbers you enter. The splits assume perfectly even pacing, which is an idealisation — real swims vary from lap to lap. Use the splits as targets and the pace as an accurate summary of the swim you actually completed.
- Completely free, with no account or limit. It works offline once the page has loaded and collects no data — your inputs never leave your device.
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