Sports
Swimming Interval Session Calculator
Calculate main-set distance, swim and rest time, send-off elapsed time, easy-section distance and duration, total session metres, pool lengths, and swim-to-rest ratio.
Main-set distance-
Rest after each completed repeat-
Between-repeat recoveries-
Main-set elapsed time-
Main-set swimming time-
Main-set recovery time-
Warm-up, drills, and cool-down-
Total session distance-
Total pool lengths-
Easy-section swimming time-
Estimated complete session time-
Main-set swim-to-rest ratio-
Decision view
Lane-wall send-off clock and distance composition
Lane-wall send-off clock and distance compositionA live pool lane shows each swim and wall recovery, while the distance rail separates warm-up, drills, main set, and cool-down.
Exact scenario comparisonSend-off interval (sec) changes while all other entered assumptions remain constant.
| Send-off interval (sec) | Main-set distance | Rest after each completed repeat | Between-repeat recoveries | Main-set elapsed time | Main-set swimming time | Main-set recovery time | Warm-up, drills, and cool-down | Total session distance | Total pool lengths | Easy-section swimming time | Estimated complete session time | Main-set swim-to-rest ratio |
|---|
How to use Swimming Interval Session Calculator
- Enter the target time actually expected for every main-set repeat.
- Use the coach's start-to-start send-off rather than rest seconds.
- Enter pool length and all easy-section distances in metres.
Calculator guide
Understanding Swimming Interval Session Calculator
A swim send-off is a clock interval, not rest duration. The swimmer earns only the difference between send-off and target time, and the final repeat does not require waiting for another send-off.
Detailed calculation process
Detailed swim send-off, wall-rest, and distance calculation
The default session includes ten 100 m repeats on 2:00, targeting 1:40, plus 1,000 m of easy work.
General formula: D_m=n*dr=max(0,s-t)n_r=max(0,n-1)T_m=n_r*s+tT_w=n*tT_r=n_r*rD=D_m+D_eL=D/lT=T_m+D_e*p_e/100 Main-set elapsed time is nine complete send-off intervals plus the final swim. Easy sections use their own distance-based pace.
What each symbol means
Worked substitution with the default inputs
The default session covers 2,000 m or 80 lengths in an estimated 42 minutes 10 seconds.
Worked situations
Practical examples
- Ten 100 m repeats create a 1,000 m main set.
- A 2:00 send-off with a 1:40 swim yields 20 seconds at the wall, but only nine such recoveries occur before the set ends.
Better inputs
Useful tips
- Use a send-off longer than the expected repeat time when rest is intended.
- Add equipment changes or coaching pauses outside this simple clock model.
- Round pool lengths only when the written set requires whole lengths.
Before relying on the result
Limitations and common mistakes
- All main-set repeats use one target time and send-off.
- Warm-up, drills, and cool-down share one average pace.
- Turns, start delay, lane traffic, equipment, technique, and fatigue are not separately modeled.
Reference
Key terms
- Send-off
- Start-to-start clock interval for successive repetitions.
- Wall rest
- Send-off minus actual repeat time, when positive.
- Pool length
- One traversal from wall to wall.
Important note
Adapt the session to swimmer ability, supervision, facility rules, health, and water safety; this calculator is not coaching or medical advice.
Frequently asked questions
What if target time exceeds send-off?
Rest is floored at zero; the entered plan is not achievable as a fixed send-off without overlap.
Why not count rest after the last repeat?
The main-set clock stops when the final target swim finishes.
Can yards be used?
This page is defined in metres; convert every distance consistently before entry.