Swim Pace Calculator
Calculate swimming pace per 100m, total swim time, or total distance in any open-water or pool event.
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How to use this calculator
Swimming pace is expressed as time per 100 metres. Given any two of pace, distance, and total time, the third can be calculated. Yards conversion: 1 m = 1.09361 yd.
- 1
Choose what you want to calculate: pace, total time, or distance.
- 2
Select the swim distance (pool event or open water).
- 3
Enter the known values — time and distance for pace, or pace and distance for time.
- 4
Review your pace in both metres and yards formats.
Frequently asked questions
What can this calculator solve for?
Any one of three values from the other two. Pace mode divides your total time by the distance and shows seconds per 100 m. Time mode multiplies your pace by the distance in hundreds of metres. Distance mode divides total time by pace and multiplies by 100. Inputs that belong to a different mode are ignored.
Which distances can I pick?
The list is fixed: 100, 200, 400, 800 and 1,500 m, 1 km, 2 km, and two open-water options. The open-water mile is stored as 1,609 m and the two-mile option as 3,219 m, both rounded to the nearest metre. There is no free distance box, though distance mode calculates one from pace and time.
How is the per-100-yard pace worked out?
It is the per-100-m pace divided by 1.09361, since 100 yd is shorter than 100 m. Pace mode shows it for reference, and distance mode shows the distance in yards using the same factor. It is a pure unit conversion; it does not model a 25-yard pool or its extra turns.
What happens if I leave a field at zero?
The main result becomes a dash when a required value is zero or negative. Pace mode needs a total time, time mode needs a pace, and distance mode needs both a pace and a total time. Seconds can be any size, so 100 seconds is read the same as 1:40.
Does it adjust for turns, wetsuits or open water?
No. It treats the stated distance as swum at one steady pace. Push-offs at walls, currents, navigation and swimming in a wetsuit all change real times, and none of them are in the arithmetic. If you want an open-water estimate, enter a pace from open-water swims.
Does it calculate Critical Swim Speed?
No, but the figure it commonly relies on is simple. CSS pace per 100 m is the difference between a 400 m and a 200 m time trial, in seconds, divided by 2. You can then enter that pace here to see what it implies for longer distances.
How are seconds rounded?
Times are rounded to the nearest whole second after the calculation, so a pace of 99.6 seconds displays as 1:40 and never as 1:39 plus 60 seconds. Distances in distance mode are rounded to the nearest metre or yard.
Swim pace calculator — pace per 100 m, finish time and distance
Why swim pace uses 100 metres
Pool swimmers measure effort per 100 m because it fits the way sets are written: four lengths of a 25 m pool or two of a 50 m pool. The calculator uses that unit throughout. Give it two of pace, time and distance, and it returns the third, so you can set repeat targets, estimate a race split or check what a set you swam actually averaged. The pace boxes take minutes and seconds separately, so 1 minute 40 seconds and 0 minutes 100 seconds mean the same thing.
Results from real runs of the tool
Every figure below was produced by the calculator.
| Mode | Inputs | Result |
|---|---|---|
| Find pace | 1,500 m in 25:00 | 1:40 /100 m, 1:31 /100 yd |
| Find pace | 400 m in 6:30 | 1:38 /100 m, 1:29 /100 yd |
| Find pace | 3,219 m in 1:10:00 | 2:10 /100 m, 1:59 /100 yd |
| Find time | 1,609 m at 1:45 /100 m | 28:09 |
| Find distance | 30:00 at 2:00 /100 m | 1,500 m, 1,640 yd |
Pacing a longer swim from a shorter one
A 400 m time trial at 6:30 gives 1:38 per 100 m. If you hold that pace for the open-water mile, the time mode tells you what it adds up to, but a longer swim may well be slower, so choose a pace you believe you can sustain, not your best short effort. The calculator does not apply a fatigue curve, so any slowing must be built into the pace you enter.
Pool, yards and open water
The yards figures use 1 m = 1.09361 yd, so they describe the same swim measured differently and do not represent a separate result from a yard pool. Open-water events do not have wall push-offs, but they add sighting and uneven conditions. Because the tool takes a single pace, run it separately with a pool pace and an open-water pace to see the gap for your own swimming.
Where the numbers stop being useful
The arithmetic is exact, but a pace is only as good as the swim it came from. Rest at the wall, drafting, equipment and technique breakdown late in a swim all change results, and the calculator cannot see them. This is general fitness information, not coaching advice. Pair it with notes from your own sessions, including the time of day, water temperature and equipment you used, and, if you swim competitively, a coach who can watch you.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →