Cardio
As of 2026-04-24
How Swim Pace Calculator works
Methodology for the Swim Pace Calculator: formulas, coefficients, data sources, assumptions, and known limitations.
Scope
Calculates swim pace, total time, or distance for any two of the three, with SWOLF and effort context.
Formula
pace_per_100 = total_time / distance * 100. SWOLF = stroke_count + seconds per length.
Coefficients
| Parameter | Value | Note |
|---|---|---|
| Pool length options | 25 m, 50 m, 25 yd |
Data sources
- World Aquatics (formerly FINA) — Facilities Rules: pool dimensions and timing standards. — Federation specification for 25 m, 50 m, and short-course pool lengths and competition timing.
- USA Swimming — Rules and Regulations: course-length and timing standards. — U.S. governing body for swimming course measurement and meet-time standards.
Assumptions
- Pool length is accurate; open-water GPS adds substantial noise.
Approximation range
Arithmetic is exact; SWOLF trends reflect stroke efficiency over sessions.
Limitations
- Pace does not capture stroke type, open-water conditions, or currents.
Reproducibility
1000 m in 18:00. Pace = 18*60/10 = 108 s/100 m = 1:48/100 m.
Change log
- 2026-04-24: methodology page first published.
Related tools
- Running Pace Calculator — Calculate pace per km and mile and project race finish times from one run.
- VO2 Max Estimator — Estimate aerobic capacity with Cooper run, Rockport walk, or no-exercise questionnaire methods.
- Walking Calorie Calculator — Estimate calories burned from walking using speed, duration, body weight, and incline.
- Calories Burned Calculator — Estimate exercise calorie burn from body weight, duration, MET intensity, and incline.