Health & Fitness
Swim Pace Calculator
Calculate swim pace per 100m or 100y, total swim time, or distance. Supports pool and open-water distances.
Pace
2:00 /100y
Total Time
30:00
Distance (y)
1500
Swimming pace basics
Swim pace is typically expressed as time per 100 meters or 100 yards. Pool distances: a standard lap pool is 25 meters (SCM - short course meters) or 25 yards (SCY); Olympic pools are 50 meters (LCM - long course meters).
Swim pace benchmarks
| Level | 100m pace | 1 km time |
|---|---|---|
| Beginner | 3:00+ | 30+ min |
| Recreational | 2:00–2:30 | 20–25 min |
| Intermediate | 1:30–2:00 | 15–20 min |
| Competitive | 1:10–1:30 | 12–15 min |
| Elite (freestyle) | <1:00 | <10 min |
Pace zones for training
Structuring swim training around pace zones - estimated from your known race pace or critical swim speed - is more effective than always swimming at one effort level:
- Zone 1 (recovery): ~60–70% of max effort; easy aerobic; long slow distance sets.
- Zone 2 (aerobic base): ~70–80%; building aerobic capacity; most of your weekly volume.
- Zone 3 (tempo): ~80–85%; comfortably hard; lactate threshold sets.
- Zone 4 (threshold): ~85–90%; hard effort sustainable for 15–20 min; CSS (Critical Swim Speed) pace.
- Zone 5 (VO₂ max): ~95%+; sprint sets, 25–50m repetitions with full recovery.
SCM to LCM conversion
Swimmers are typically 1.5–2% slower in a 50-metre long-course pool (LCM) compared to a 25-metre short-course pool (SCM/SCY) at the same effort level. This is because short-course pools allow more turns per 100m, and the push-off from each wall provides a brief speed boost.
A rough conversion: add approximately 2–3 seconds per 100m to your SCM pace to estimate your LCM equivalent pace. Elite swimmers' times may differ more due to highly refined turn and underwater dolphin kick technique.
Triathlon swim pacing
Open-water triathlon swimming differs significantly from pool swimming:
- Sighting: lifting your head to spot buoys disrupts your stroke and adds approximately 5–10 seconds per 100m compared to your pool pace.
- Wetsuit: a triathlon wetsuit increases buoyancy and reduces drag, typically adding 5–8% speed in open water compared to a pool swim in a swimsuit.
- Mass start and drafting: swimming directly behind another swimmer reduces drag by 15–20%. Position yourself behind a slightly faster swimmer in the first few hundred metres.