Use this swim time converter to translate a race time between the three competition courses: short course yards (SCY), short course meters (SCM) and long course meters (LCM). Pick your event, enter a time such as 1:05.50, and see the equivalent time on another course, with the exact conversion factor shown underneath so you can check the math yourself. Converted times are estimates for comparison, seeding and goal setting, not guarantees of what you will swim.
1:14.15
Converted with the 100 Freestyle SCY->LCM factor 1.132
How to Use This Swim Time Converter
- Choose the event. Conversion depends on stroke, because strokes gain different amounts from turns. Select the exact event you swam, from the 50 freestyle up to the 1500 freestyle, plus the main backstroke, breaststroke, butterfly and individual medley races.
- Set the two courses. From is the pool the time was swum in and To is the pool you want the equivalent for. SCY means a 25-yard pool, SCM a 25-meter pool and LCM a 50-meter pool.
- Type the time. Use seconds with hundredths, such as 52.43, or minutes and seconds, such as 1:05.50. The result updates as you change anything, with no button to press.
- Read the result and the factor together. The large figure is the converted time rounded to the nearest hundredth. The line underneath names the event, the course pair and the factor that was multiplied or divided, so a coach can reproduce the calculation on paper.
- Treat the answer as an estimate. Use it to compare swimmers, plan entries and set goals. Only a time actually swum on the target course counts for official qualification where a governing body requires one.
Why the Same Swimmer Posts Three Different Times
A race is not just distance. Every length ends with a turn, and a turn is fast: the swimmer pushes off the wall and glides underwater at a speed most cannot hold on the surface. Short pools pack in more turns per race, so they reward that skill more often. A 100-meter race in a 50-meter pool has one turn. The same event in a 25-meter pool has three, and in a 25-yard pool it has three turns over a slightly shorter total distance, because a yard is 0.9144 meters.
That is why the ordering is so consistent. Short course yards times are normally the fastest on the clock, short course meters times sit in the middle, and long course meters times are the slowest, even though the swimmer and the effort are the same. The gap also grows with distance, because a longer race multiplies the number of extra turns, and it varies by stroke, because the strokes use the wall differently. Butterfly and backstroke swimmers can extend their underwater kicking after each push-off, while breaststroke rules allow only one underwater pullout per turn, so breaststroke gains a little less from a short pool.
The Course Conversion Method and Factors
This converter uses the published stroke factor table set out in the research notes for this page, based on the NCAA administrative factors and USA Swimming guidelines as published by OnlyCalculators in its standard course conversion factors by stroke table. The independent SportsEngine Motion help documentation points the same way: a default factor of 1.11 between yards and short course meters, and about two percent between short course meters and long course meters. Rather than hiding those numbers, the tool prints the factor it used under every result.
The method is multiplication on total seconds. To move from SCY to SCM, multiply by the first factor for the stroke. To move from SCM to LCM, multiply by the second factor. To move directly from SCY to LCM, multiply by the third factor, which is the combined effect of the first two. Reverse conversions divide by the same factor, which is why converting there and back returns you to your starting time apart from hundredth rounding.
| Stroke | SCY to SCM | SCM to LCM | SCY to LCM |
|---|---|---|---|
| Freestyle | 1.110 | 1.020 | 1.132 |
| Backstroke | 1.110 | 1.025 | 1.138 |
| Breaststroke | 1.110 | 1.015 | 1.127 |
| Butterfly | 1.110 | 1.025 | 1.138 |
| Individual Medley | 1.110 | 1.020 | 1.132 |
| 1500 / 1650 Freestyle (special) | 1.003 | 1.020 | 1.023 |
The distance freestyle row deserves its own explanation. A 1650-yard race covers about 1509 meters, only nine meters more than a 1500-meter race, so the usual 1.11 yard-to-meter factor would massively over-correct an event whose two versions are almost the same length. The published special factor of 1.003 for the SCY to SCM leg reflects that tiny distance gap, and this converter applies it whenever you select the 1500 freestyle. Standard championship distance pairings that change the race distance itself, such as 500 yards against 400 meters, need meet-specific rules and are not folded into this general converter.
Worked Examples
Example 1: the default swim. A 100 freestyle swum in 1:05.50 in a yards pool is 65.50 seconds. Multiply by the freestyle SCY to LCM factor of 1.132 and you get 74.146 seconds, which rounds to 1:14.15 long course. The tool shows exactly that factor under the result, so the estimate can be checked in one line.
Example 2: one step at a time. The same 65.50 seconds converted only as far as short course meters uses the 1.110 factor: 65.50 times 1.110 is 72.705 seconds, shown as 1:12.71 after rounding to hundredths. Notice that the short course meters time is already much slower on paper than the yards time, mainly because each length is longer, even before the long course turn effect is added.
Example 3: why stroke matters. Take a 100 breaststroke in 1:10.00 short course meters and convert it to long course. Breaststroke uses the smallest SCM to LCM factor, 1.015, giving 71.05 seconds, or 1:11.05. A backstroker with the same starting time converts with 1.025 and lands at 1:11.75. Same clock, same course change, different answer, because the strokes do not gain equally from the extra turns in the short pool.
Example 4: going backwards. A long course 200 butterfly time of 2:20.00 is 140 seconds. Divide by the butterfly SCY to LCM factor of 1.138 to estimate the yards equivalent: about 123.02 seconds, or 2:03.02. Coaches use this direction when a swimmer with long course results enters a yards meet and needs a sensible seed time.
When Converted Times Help, and When They Do Not
Converted times are at their best in comparison jobs. A college recruiter comparing a yards swimmer with a meters swimmer needs both on one scale. A swimmer moving from a winter short course season to a summer long course season needs realistic goal times. A parent trying to understand whether a new personal best is actually an improvement over an old one set in a different pool needs the courses reconciled before the celebration or the disappointment.
They are weaker as predictions. The factors are population averages built from large numbers of recorded swims. A swimmer with outstanding turns and long underwaters will usually beat the conversion when moving to a short pool and lose more than the factor suggests when moving to a long one. A swimmer whose turns are a work in progress shows the opposite pattern. Illness, pacing, altitude, pool temperature and simple race-day form all sit outside any factor table. Use the converted time as the starting estimate, then replace it with a real swim as soon as you have one, and check your governing body rules before relying on a conversion for entry or qualification, because some meets accept conversions and some do not.
Common Mistakes to Avoid
- Converting by distance alone. Multiplying by the yard-to-meter distance ratio, about 1.094, ignores the turn effect entirely and understates almost every course change. The published factors are larger because they include both distance and turns.
- Using one factor for every stroke. Breaststroke and butterfly do not convert alike. Always select the real event in the converter instead of reusing a freestyle factor for the whole meet sheet.
- Forgetting the 1500 freestyle exception. Applying 1.110 to the mile-style freestyle event produces a nonsense time, because the yard and meter versions are nearly the same distance. The special 1.003 factor exists for exactly this race.
- Presenting an estimate as an official time. A converted time is a comparison figure. If a qualifying standard must be swum in a specific course, only an actual swim in that course will satisfy it under most rules.
- Typing the time in the wrong format. Entering 105.50 when you mean 1:05.50 tells the converter you swam 105.50 seconds. Use a colon between minutes and seconds, as the input label shows.
More Tools on This Site
Swimming is timed effort over distance, and a few neighboring tools cover the land-based cousins of that idea. The Running Pace Calculator turns a running time and distance into pace and predicted finishes, the Time Calculator adds and subtracts durations for training logs, and the Date Calculator counts the days until your next meet. If your seed times live in chat or team messages, the Discord Timestamp Converter formats dates and times for Discord posts.
Frequently Asked Questions
What does SCY, SCM and LCM mean?
SCY is short course yards, racing in a 25-yard pool, the standard for United States high school and college swimming. SCM is short course meters, racing in a 25-meter pool. LCM is long course meters, racing in a 50-meter pool, the format used at the Olympic Games and World Championships.
How does this swim time converter calculate the new time?
It turns your time into total seconds, then multiplies or divides by a published stroke-specific factor for the course pair you chose. Freestyle uses 1.110 from SCY to SCM and 1.020 from SCM to LCM, for a combined 1.132 from SCY to LCM. The exact factor used is printed under every result.
Why are short course times faster than long course times?
Because short pools have more turns, and every turn gives a push-off and an underwater glide that is faster than surface swimming. A 25-yard pool also covers slightly less distance per length than a 25-meter pool. Both effects make the clock stop earlier in short course racing.
Why does breaststroke convert differently from butterfly?
The strokes gain different amounts from each turn. Butterfly and backstroke swimmers can use extended underwater dolphin kicks after a push-off, so their long course penalty is a little larger, at a factor of 1.025 from SCM to LCM. Breaststroke allows only one underwater pullout per turn, so its factor is smaller, at 1.015.
Are converted swim times official?
Generally, no. A converted time is a well-founded estimate for comparison, seeding discussions and goal setting. Whether a meet accepts a converted time for entry or qualification depends on that meet and its governing body, and many top standards must be achieved by an actual swim in the specified course.
Why does the 1500 freestyle use a factor of only 1.003?
Because the two versions of the event are almost the same length: 1650 yards is about 1509 meters, barely longer than 1500 meters. The normal 1.110 yard-to-meter factor would correct for a distance gap that barely exists, so the published table gives this event its own factor of 1.003 for the SCY to SCM leg.