Swimming Pace Calculator
Find your rhythm. Know every length. Plan your next swim.
Your Pace Dashboard
400 m in 7:00 · average over the entered time
Length = one crossing. Round trip = two lengths.
At This Pace
Even-pace projections, not predicted race results.
Pool Length Explorer
25 m pool
1 length · 25 m · 26.3 sec
1 round trip · 50 m · 52.5 sec
Schematic illustration · not to scaleYour Even-Pace Splits
| Distance | Lengths | Cumulative time |
|---|---|---|
| 100 m | 4 | 1:45 |
| 200 m | 8 | 3:30 |
| 300 m | 12 | 5:15 |
| 400 m | 16 | 7:00 |
Calculated from your overall average; these are not recorded split times.
Make Your Pace Meaningful
Freestyle- Keep breathing and stroke rhythm consistent.
- Compare sessions in the same pool length.
- Use moving time for swim-only pace; elapsed time includes rest.
Calculation & Assumptions
- Pace per 100 m
- = total seconds ÷ distance (m) × 100
- Lengths
- = distance ÷ pool length
- Time per length
- = total seconds ÷ lengths
- Average speed (km/h)
- = distance (m) ÷ seconds × 3.6
Yards are converted using 1 yd = 0.9144 m. This is not a race-course time conversion.
Frequently Asked Questions
Is a lap one length or two?
Usage varies. Here a length is one crossing of the pool, and a round trip is out and back: two lengths. In a 25 m pool, 400 m gives 16 lengths or 8 round trips. If the distance is not a whole multiple of the pool length, displayed counts include a partial length.
Can I use yards?
Yes. Distance can be entered in metres or yards. Switching the distance unit converts the physical distance using 1 yd = 0.9144 m and changes the main pace reference to 100 of the selected unit. Pool length is selected separately. This does not apply a race-time adjustment for different courses, turns or strokes.
Should rest breaks be included?
Use moving time for swim-only pace. If you enter elapsed time including rest, those rests are included in the calculated average. The split table and projected times are even-pace arithmetic from that average, not recorded splits or predicted race performance.
Sources & References
Pool lengths & competition conventionsPool length standards and competition rules.
Pool length terminologyInformation on pool lengths in metres and yards for fitness and competition.Yards & metresGuidance on using yards and metres in U.S. Masters Swimming programs.Sources inform the content. Estimates are based on your inputs and general activity references. No institutional endorsement is implied.
Find your rhythm. Know every length. Plan your next swim.