Everything a new coach or timer needs: the buttons, timing a swimmer accurately, and calculating stroke rate, stroke count, and pace — with drills to practice each skill.
Layouts vary by brand, but nearly every two-button coaching stopwatch follows this pattern:
1Start/Stop — press once to start the clock running, press again to stop it.
2Lap/Split — records the current time without stopping the clock, so you can catch each rep in a set.
3Display — usually shows minutes:seconds.tenths. Some watches switch to a memory/review mode with the same button held down.
Reset is typically a separate button on the underside, or you hold Start/Stop for a couple of seconds once the watch is stopped — check your specific model, since this is the one that varies most between brands.
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Timing a Swimmer
The goal is consistency — the same trigger and the same stopping point every time, so times are comparable across a season.
Start on a consistent cue — the whistle, "go," or the swimmer's hand/feet leaving the wall or block. Pick one and stick with it for a given set.
Stop the instant the swimmer touches — hand-to-wall for most strokes, per your set's finish rule.
Use Lap/Split for repeat sets — press it at each finish without stopping the clock, so you capture every interval and still have the full set time at the end.
Round consistently — pick a convention (e.g. always round up to the nearest tenth) and use it every time, so times stay comparable.
Good to know
Human reaction time adds roughly 0.2–0.3 seconds of error on both the start and the stop. That's fine for tracking practice progress, but it's why official race times come from touchpads and automatic timing systems, not a coach's stopwatch.
Stroke rate is how many arm cycles a swimmer completes per minute. A cycle is one full arm cycle — e.g. the right hand entering the water, all the way around to the right hand entering again.
The 3-cycle method
Pick a reference point — e.g. the swimmer's right hand entering the water.
Start your stopwatch on one entry.
Stop it on the fourth entry of that same hand — that's 3 complete cycles.
Formula
Stroke rate (cycles/min) = 180 ÷ seconds for 3 cycles
3 cycles × 60 seconds, divided by the time it actually took — same math, shortcut version.
Worked example
3 cycles take 4.2 seconds → 180 ÷ 4.2 ≈ 43 cycles per minute.
Stroke count is simply how many strokes a swimmer takes to complete one length — a different number from stroke rate, and just as useful. Where stroke rate measures tempo, stroke count measures efficiency: how much distance a swimmer covers per stroke.
How to count
Start counting from the first stroke after the push-off — not the push-off or the glide itself.
Count each individual arm entry (left and right both count) through to the touch.
Some coaches count full cycles instead of single-arm entries — either works, just stay consistent within a squad so counts are comparable swimmer to swimmer.
Worked example
A swimmer takes 16 strokes to cross a 25m length.
Distance per stroke
Pair stroke count with the length swum to see how far each stroke is actually carrying the swimmer:
Formula
Distance per stroke = length ÷ stroke count
Longer distance per stroke generally means a more efficient pull — up to a point; too few strokes can mean over-gliding and losing speed between strokes.
Worked example
25m ÷ 16 strokes = ≈1.56m per stroke.
What to watch for
Stroke count creeping up late in a swim is one of the clearest signs of fatigue — the stroke is shortening even if the rate holds steady. Tracking count and rate together gives a fuller picture than either alone.
Watch the circle pulse on each simulated hand entry. Press Lap on entry 1, then again on entry 4 — that's 3 full cycles. I'll calculate your measured stroke rate and compare it to the actual simulated rate.
00:00.0
ENTRY
Press Start, then tap Lap on each pulse.
Result
Your taps (entry 1 → entry 4)—
Your measured stroke rate—
Actual simulated rate—
A simulated swimmer crosses one length. Every flash is a stroke — tap Count once per flash to keep a running tally, just like counting by eye on the deck. At the wall, I'll compare your tally to the actual count.
00:00.0
STROKE
0
Press Start, then tap Count on every flash.
➜
Result
Your count—
Actual stroke count—
Distance per stroke (25m length)—
A simulated swimmer completes 5 reps at slightly uneven intervals — just like real swimming. Press Lap each time the marker touches the wall. It records a split without stopping the overall clock, exactly like a real repeat set.
00:00.0
➜
Press Start, then tap Lap on every wall touch.
Splits
Quick Reference
Stroke rate = 180 ÷ seconds for 3 cycles
Distance per stroke = length ÷ stroke count
Pace per 100 = (total seconds ÷ total distance) × 100