Pace / 100m
1:42
CSS Pace
1:50
Total
25:30
Enter your all-out 200m and 400m times to calculate Critical Swim Speed.
Pace per 100m
1:42
Critical Swim Speed (CSS)
1:50 / 100m
Inputs
Result
25:30 = 1530 sec. 1530 / 15 = 102 sec per 100m = 1:42.
Inputs
Result
T400=410s, T200=190s. CSS speed = 200/(410−190) = 0.91 m/s. Pace = 100/0.91 = 110s = 1:50.
For recreational swimmers, 2:00–2:30 per 100m is average. Competitive swimmers range from 1:00–1:30. Elite swimmers go under 1:00. Your pace depends on stroke efficiency, fitness, and distance.
| Level | Pace / 100m | 1500m Time |
|---|---|---|
| Beginner | 2:30 | 37:30 |
| Intermediate | 1:50 | 27:30 |
| Advanced | 1:20 | 20:00 |
CSS is your threshold pace—the fastest speed you can sustain without accumulating lactate. It is calculated from your 400m and 200m time trial results: CSS = (400 − 200) / (T400 − T200).
Focus on technique first—better body position and catch mechanics improve pace more than fitness alone. Drill work, threshold sets at CSS pace, and reducing strokes per length all build speed.
Yes. A 25-yard pool is 8.6% shorter than a 25-meter pool, so your yards pace will be faster. To convert: multiply yards time by 1.1 to estimate meters pace, or divide meters time by 1.1 for yards.
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Last Updated: Mar 20, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.