Swim Time Converter: SCY, SCM & LCM
The swim time converter helps you compare your short and long course results. You can also check what your record would be if you used the other measuring system — convert meters to yards or yards to meters swimming. This calculator supports all three competition pool formats recognized worldwide: SCY (Short Course Yards), SCM (Short Course Meters), and LCM (Long Course Meters).
Swimming and Health
Swimming is one of the healthiest and most natural sports. Regular swimming reduces your risk of cardiovascular disease, helps burn calories, and uses all of your muscle groups. Being in water takes a lot of stress off your bones due to your effective weight being less — it is good for your spine, joints, and recovery. The only other way you can get the same low-impact full-body workout is by floating freely in space.
Yards to Meters (and Vice Versa)
This swim time converter performs meters-to-yards conversion and the reverse — yards-to-meters conversion — for competitive swimming. But it is not only about the length of the pool. The swimmer's efficiency during a race also differs between pool types because of the number of turns, underwater phases, and start advantages.
SCY, LCM, SCM — What Are Those?
- SCY — Short Course Yards: A 25-yard pool (≈22.86 m). Used primarily in the United States; USA Swimming maintains SCY national records. Swimmers complete more turns per race, which provides a turn-push advantage and allows more frequent underwater dolphin-kick phases.
- SCM — Short Course Meters: A 25-meter pool. Common in Europe and many international competitions. FINA (World Aquatics) recognizes SCM world records. Slightly longer pool than SCY, so fewer turns per race than SCY but more than LCM.
- LCM — Long Course Meters: A 50-meter pool — the Olympic standard. All Olympic Games and World Aquatics Championships use LCM. The fewest turns per race mean swimmers rely more on pure aerobic capacity and less on wall-push advantage.
Differentiating between these three pool types is crucial when comparing swimmers' records. The most extreme contrast is between SCY and LCM: although the final race distance is equivalent, swimmers alternate swimming phases much more often in SCY, reaching their highest speed just after each turn. This maintains a greater average velocity throughout the race.
How to Use This Swim Time Converter
- Choose the distance — select your event (50, 100, 200, 500/400, 1000/800, or 1650/1500).
- Choose your stroke — Freestyle, Backstroke, Breaststroke, Butterfly, or Individual Medley (IM). Note: IM is not available for 50-yard/meter events or long-distance events.
- Enter your time — type the minutes and seconds of your result.
- Select the pool type in which you achieved that result (SCY, SCM, or LCM).
- The calculator instantly displays your equivalent times in all three pool formats.
Conversion Factors Used
This calculator uses the standard conversion factors published by USA Swimming and recognized internationally:
- SCY → SCM (50 & 100): ×1.1068 — accounts for the yards-to-meters distance difference plus the additional turn advantage in the shorter SCY pool.
- SCY → SCM (200): ×1.1124 — slightly higher because the 200 event has more turns in a 25-yard pool compared to a 25-meter pool.
- SCY 500y → SCM 400m & SCY 1000y → SCM 800m: ×0.8756 — adjusts for the shorter metric race distance and the turn-count difference.
- SCY 1650y → SCM 1500m: ×0.9962 — the distances are nearly equal (1650 yards ≈ 1508.8 meters), so the factor is close to 1.
- SCM → LCM (50 & 100): ×1.0161 — LCM has fewer turns, removing a key speed advantage.
- SCM → LCM (200): ×1.0089; 400m: ×1.0025; 800m: ×1.0032; 1500m: ×1.0038.
Conversions are estimates based on statistical averages. Actual results may vary depending on the swimmer's individual strengths, underwater technique, and turn speed.
Why Do Pool Types Matter for Your Times?
A swimmer's results depend strongly on their physical abilities — aerobic capacity (VO2 max), anaerobic power, and stroke efficiency. But they also depend on how many times they push off the wall. In a 100-meter freestyle:
- SCY 100y (25y pool): 3 turns
- SCM 100m (25m pool): 3 turns
- LCM 100m (50m pool): 1 turn
For the 100, SCY and SCM have the same number of turns but different distances — that is why the factor is mainly a distance correction. For the 50, LCM has zero turns while SCM has one, making SCM slightly faster despite the same distance. For longer events, the difference per turn becomes proportionally smaller but still measurable.
American vs. Metric System in Swimming
The United States is the only major swimming nation that trains and competes primarily in yards (SCY). College swimming, high school swimming, and most club training in the US use 25-yard pools. The rest of the world uses meters. This means US swimmers must convert their times when comparing with international peers — that is exactly what this calculator is for.