Swim Pace Calculator
The pace per 100 is the number that matters.
Swim Pace Calculator
Pace per 100 m = total seconds / distance x 100; speed = distance / total seconds.
Calculated instantly
Embed this calculator
Put this calculator on your own site with the snippet below. The frame contains the tool only, reports its own height, and carries a visible link back to the full page. Embedding is free; keep the attribution link as it is, and do not wrap the frame in a way that hides it.
Preparing the embed code for this page...
What This Calculator Does
The Swim Pace Calculator converts a swim time and distance into pace per 100 metres, average speed, and a 25 m split. Pace per 100 is the standard shorthand for swimming speed and the easiest way to compare efforts across distances.
How It Works
Minutes are converted to seconds and added to the seconds field to get total time. Dividing by distance and multiplying by 100 gives seconds per 100 metres. Dividing that by 60 expresses the pace in decimal minutes. Average speed is distance divided by total seconds. The 25 m split applies the same pace to a quarter of a 100 m length.
Example
A 1,500 m swim in 30:00 is 1,800 seconds. Pace per 100 m is 1,800 / 1,500 x 100 = 120 seconds, or 2:00 per 100. Average speed is 0.833 m/s, and a 25 m split is 30 seconds.
Formula
minutes x 60 + secondstotal seconds / distance x 100distance / total secondstotal seconds / distance x 25Reading the Results
Pace per 100 m
Seconds per 100 metres, the standard swimming pace unit. Convert the decimal seconds to minutes and seconds for a clock-style readout.
Pace per 100 m in minutes
The same pace in decimal minutes, useful for spreadsheet comparisons or for converting to a training interval.
Split per 25 m
The average time per 25 m length at this pace. Actual splits vary with turns, starts, and pacing strategy.
Sources and References
World Aquatics - Competition Regulations
Course lengths and competition distances
The governing rules for 25 m and 50 m courses and standard event distances.
USA Swimming - Training and Pace Guidance
Pace per 100 and set design
Coaching guidance on using pace per 100 to set training intervals.
References identify the method or data behind this calculator. Where a standard or tariff changes, the current edition applies, and the assumptions stated above take precedence over a remembered figure.
Frequently Asked Questions
How do I read a swim pace of 2:00 per 100?
It means two minutes for every 100 metres. A 400 m swim at that pace takes 8:00, and a 1,500 m swim takes 30:00. Pace per 100 is used because it makes different distances directly comparable.
Why is my short-course pace faster than long-course?
A 25 m pool has twice as many turns as a 50 m pool, and each push-off adds speed without a stroke. The difference is usually a few seconds per 100. Compare times only within the same course length, or use a conversion factor with caution.
Does this calculator include turns and starts?
It uses total time, so turns and the start are included in the average. It does not break them out. For a detailed race analysis, record splits per length and compare the turn times separately.
How can I use pace per 100 in training?
Set an interval slightly above your pace to allow rest. If your pace is 2:00 per 100, a set of 10 x 100 on 2:20 gives about 20 seconds rest per repeat. Adjust the interval to the purpose of the set rather than holding one number for every workout.
Can I use this for open water?
Yes, but treat the result as a pool-equivalent reference. Open water adds sighting, waves, current, and no turns, and wetsuits change buoyancy and speed. A pool pace is a useful fitness marker, not a precise race prediction.