Free swim tool
Swim Pace Calculator
Distance and time in. Pace, splits, and CSS out, instantly.
Tip: switch to CSS to turn a 400m + 200m test into training zones.
How to calculate swim pace
Swim pace is how long it takes to cover a fixed distance, shown per 100m or 100yd. Divide your total time by your distance, then scale to 100.
Pace /100 = total time ÷ (distance ÷ 100)Swim 1,500m in 24:00: that's 1,440 seconds ÷ 15 = 96 seconds, or 1:36 per 100m. The same swim is 0:48 / 50m and about 1.04 m/s.
Critical Swim Speed (CSS)
CSS is your threshold swim pace, estimated from a 400m and a 200m time trial. Switch the tool to CSS mode to get it, plus training zones.
CSS /100 = (400m time − 200m time) ÷ 2Swim pace to race-time reference
What a given pace per 100m means across the four standard triathlon swim distances. Sanity-check a goal before race day.
| Pace /100m | 750m Sprint | 1,500m Olympic | 1,900m 70.3 | 3,800m Ironman |
|---|---|---|---|---|
| 1:20 | 10:00 | 20:00 | 25:20 | 50:40 |
| 1:40 | 12:30 | 25:00 | 31:40 | 63:20 |
| 2:00 | 15:00 | 30:00 | 38:00 | 76:00 |
| 2:20 | 17:30 | 35:00 | 44:20 | 88:40 |
Typical swim pace by level
Use these as orientation, not targets. They are steady, continuous efforts per 100m. Pool pace usually runs faster than open water.
| Level | Pace /100m | 1,500m time |
|---|---|---|
| Beginner | 2:10 to 2:40 | ~32:30 to 40:00 |
| Intermediate age-grouper | 1:45 to 2:10 | ~26:15 to 32:30 |
| Advanced age-grouper | 1:25 to 1:45 | ~21:15 to 26:15 |
| Elite / ex-competitive | 1:05 to 1:25 | ~16:15 to 21:15 |
The only number that matters long term is your own, moving in the right direction. Chase your trend, not someone else's chart.
Pace, speed, and unit conversions
Coaches and apps quote swim pace in different units. Here is the same effort expressed every common way, so you can compare like with like.
| Pace /100m | Pace /100yd | Pace /50m | Speed (m/s) | Speed (km/h) |
|---|---|---|---|---|
| 1:20 | 1:13 | 0:40 | 1.25 | 4.50 |
| 1:40 | 1:31 | 0:50 | 1.00 | 3.60 |
| 2:00 | 1:50 | 1:00 | 0.83 | 3.00 |
| 2:20 | 2:08 | 1:10 | 0.71 | 2.57 |
A 100yd is about 91.4% of 100m, so a yard pace always reads faster than the same effort in meters. Compare pool to pool and unit to unit.
Three ways to use this calculator
Switch modes at the top of the tool:
- Pace, distance and time in; your pace per 100 and 50, your speed, and projected race splits out.
- Time, a target pace and a distance in; your projected total time out. Use it to set a realistic race goal.
- CSS, a 400m and 200m time trial in; your threshold pace and training zones out.
Swim pace calculator FAQ
How do I calculate swim pace?
Divide total time by distance, then scale to 100. Pace per 100m = total seconds ÷ (distance ÷ 100). For 1,500m in 24:00 that's 1,440 ÷ 15 = 96 seconds, or 1:36 per 100m.
What is a good swim pace?
It depends on level and distance. Many age-group triathletes sit 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.
Does pool pace transfer to open water?
Not cleanly. Sighting, no push-off walls, chop, wetsuit feel and mass-start stress usually add time. Treat pool pace as the ceiling and expect open water to be slower until you've practised it.
How do I calculate CSS?
Subtract your 200m time-trial time from your 400m time, then divide by 2. The result is your CSS pace per 100, in the same unit as the test.
What is a good 100m swim time?
For a single hard 100m, many age-group triathletes are around 1:30 to 1:50; strong pool swimmers go under 1:15. A steady, repeatable pace across a full swim is slower than your one-off 100.
How do I get faster at swimming?
Pace is the outcome, not the lever. The levers are propulsion, the useful force through your catch, pull and push, and consistency, the sessions you actually complete. Train both, then retest your pace.
Should I use meters or yards?
Match your pool. Work in yards for a 25yd pool, meters for a 25m or 50m pool. Keep the unit consistent between sessions, or you will think you got slower when you only switched units.
What pace tells you, and what it can't
Pace is an outcome. It tells you what happened on a given day in a given pool, not why, and not what to change. Two swimmers can hit the same 1:40/100m with completely different strokes: one efficient, one fading after 400m.
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. That's the part you can actually train. ZWIM measures it as Propulsive Watts, so you train the propulsion that creates the pace, not just the number on the watch.
The other thing pace hides is consistency. Most age-group triathletes don't have a motivation problem, they have a pool-access problem: the sessions they planned but couldn't get to. Connected Swim Training is built for the days you can't reach the pool, so a missed session doesn't become a missed week.
Related swim tools
Know your pace. Now train the propulsion behind it.
ZWIM is Connected Swim Training for home: real Propulsive Watts and a real game, for the days you can't get to the pool.
Pace and CSS figures are estimates for training guidance, not a race promise. Open-water results vary with conditions. ZWIM helps you train between pool days; it does not replace pool swimming.