Swim pace
How to Calculate Swim Pace
Distance and time in. Your pace per 100, in under a minute.
1,500m in 24:00 = 1:36 per 100m.
Pace per 100 = total time ÷ (distance ÷ 100).
Convert your time to seconds, divide your distance by 100 to get the number of 100s you swam, then divide one by the other.
Or skip the math: the free Swim Pace Calculator does it instantly, and also returns your pace per 50, your speed, and projected race splits.
Swim pace
The formula
Swim pace is just your time spread evenly across every 100 you swam.
Convert your time to seconds. Divide your distance by 100 to get the number of 100s you covered. Then divide the seconds by that number.
The result is the time it took you to cover an average 100, which is the number coaches, calculators, and race planners all speak in.
Swim pace
Worked examples
Two runs of the same formula, one in meters and one in yards.
Example in meters
- Distance: 1,500m, so 1,500 ÷ 100 = 15
- Time: 24:00 = 1,440 seconds
- Pace: 1,440 ÷ 15 = 96 seconds = 1:36 / 100m
Example in yards
- Distance: 1,000yd, so 1,000 ÷ 100 = 10
- Time: 18:20 = 1,100 seconds
- Pace: 1,100 ÷ 10 = 110 seconds = 1:50 / 100yd
Same arithmetic every time. The only thing that changes is the unit.
Swim pace
Meters or yards: don't mix them
A pace per 100m and a pace per 100yd are not the same, because the distance is different.
If your pool is 25 yards, work in yards. If it is 25m or 50m, work in meters.
When you compare sessions, compare like with like. Mixing units is the fastest way to convince yourself you got slower when you didn't.
Swim pace
Pace to race-time reference
If you hold a steady pace, here is roughly what each common triathlon swim leg would take. Race-day conditions add time, so treat these as flat-water estimates.
For the full Ironman swim (3800m), multiply the pace by 38: a 1:40/100m holds for about 1:03:20, and a 2:00/100m for about 1:16:00.
To work out any race time yourself: time = pace per 100 × (distance ÷ 100). A 1:50/100m pace over 1,900m is 19 × 1:50 = 34:50.
Swim pace
What pace can, and can't, tell you
Pace is the scoreboard. It tells you what happened over a distance, on a given day, in a given pool. It is the outcome.
It does not tell you why, or what to change. Two swimmers can hit the same 1:40/100m with completely different strokes.
What pace can't see is propulsion: how much useful force your hand and forearm put into the water during the catch, pull, and push. It also can't see consistency, the difference between one good 100 and ten of them.
That propulsion is the part you can train. ZWIM measures it as Propulsive Watts, so the work between pool days has a number instead of a guess.
The pool stays where pace gets proven. Connected Swim Training is for the days between pool days. It turns a blank swim day into measurable propulsion work.
FAQ
FAQ
How do I calculate swim pace?
Divide your total time by your distance and scale it to 100: pace per 100 = total seconds ÷ (distance ÷ 100). Swim 1,500m in 24:00 and that is 1,440 ÷ 15 = 96 seconds, or 1:36 per 100m.
To skip the arithmetic, the free Swim Pace Calculator does it instantly.
What is a good swim pace?
It depends on level and distance. Many age-group triathletes hold around 1:45 to 2:15 per 100m for a steady open-water effort; competitive pool swimmers go well under 1:20.
Track your own pace over time rather than chasing someone else's number.
Does pool pace transfer to open water?
Not cleanly. Sighting, no walls to push off, chop, wetsuit feel, and mass-start stress usually add time.
Use pool pace as your controlled baseline, then expect open water to read a little slower.
How do I get faster?
Pace tells you the outcome, not the lever. The lever is propulsion: more useful force through the catch, pull, and push, held consistently.
Keep proving the full stroke in the pool, and train propulsion on the days between with feedback you can see. If you want threshold pace and training zones, the critical swim speed (CSS) calculator sets your zones.
Swim pace
Skip the math
You now know the formula. On a day you would rather just see the number, let the calculator do it.
Distance and time in. Your pace per 100, per 50, your speed, and projected race splits out.
Then explore the rest of the free swim calculators for CSS, splits, and more.