Swim Pace Calculator

Pool swimming pace is usually expressed as time per 100 meters (or per 100 yards in US pools). Divide total seconds by distance in hundreds — 500 m in 8:20 (500 sec) → 100 sec per 100 m → 1:40/100m.

Long-course (50 m) and short-course (25 yd) pools use the same pace math — only the unit label changes. Open-water pace is slower due to sighting, currents, and no wall push-offs.

Select pool unit (meters or yards) before entering distance. Mixing units when comparing paces leads to errors — 100 m and 100 yd differ by about 9%.

Worked example with defaults: 1500 m in 28:00 (1680 sec) → 1680 ÷ 15 = 112 sec/100m → 1:52 per 100 m. That is a solid masters pace for steady aerobic work.

For interval sets, calculate pace on swimming time only — exclude rest at the wall unless you are doing send-off intervals. A 10 × 100 m set with 10 sec rest between reps uses per-rep swim time, not total set duration.

Convert between meters and yards mentally when racing in a different pool length: multiply or divide pace by the unit ratio when comparing to your home pool benchmarks.

Flip turns and push-offs shave time in pool sets — pace calculated from push-off to push-off will look faster than mid-pool timing. For apples-to-apples comparison, use the same turn style every rep when benchmarking progress.

Triathletes comparing pool training to race-day open-water swim should expect slower effective pace outdoors — add 5–15 seconds per 100 m for sighting and no-wall rhythm. Use pool pace here as a baseline, not a race forecast.

Limits: no stroke-type adjustment, no turn count, and no wetsuit or open-water factors. Pool pace does not transfer directly to lake or ocean swims.