A swim pace chart converts your pace per 100 metres into an estimated finishing time for longer distances.
At a pace of 2:00 per 100 metres, for example, 750 metres takes approximately 15 minutes, 1,500 metres takes 30 minutes, a 1.9 km Half Ironman swim takes 38 minutes, and a 3.8 km Ironman swim takes 1 hour and 16 minutes.
These calculations are useful for setting training targets, comparing pool sessions and estimating triathlon swim splits. However, a mathematical prediction assumes that you maintain the same pace throughout the complete distance.
Open water conditions, navigation, drafting, wetsuit use, congestion and the distance recorded by your watch can all change the actual result.
Use the complete swim pace chart below to compare 100-metre pace with estimated times for sprint, Olympic, Half Ironman and full-distance Ironman swimming.
Swim pace chart at a glance
| Pace per 100 m | 750 m | 1,500 m | 1.9 km | 3.8 km |
|---|---|---|---|---|
| 1:00 | 7:30 | 15:00 | 19:00 | 38:00 |
| 1:05 | 8:08 | 16:15 | 20:35 | 41:10 |
| 1:10 | 8:45 | 17:30 | 22:10 | 44:20 |
| 1:15 | 9:22 | 18:45 | 23:45 | 47:30 |
| 1:20 | 10:00 | 20:00 | 25:20 | 50:40 |
| 1:25 | 10:38 | 21:15 | 26:55 | 53:50 |
| 1:30 | 11:15 | 22:30 | 28:30 | 57:00 |
| 1:35 | 11:52 | 23:45 | 30:05 | 1:00:10 |
| 1:40 | 12:30 | 25:00 | 31:40 | 1:03:20 |
| 1:45 | 13:08 | 26:15 | 33:15 | 1:06:30 |
| 1:50 | 13:45 | 27:30 | 34:50 | 1:09:40 |
| 1:55 | 14:22 | 28:45 | 36:25 | 1:12:50 |
| 2:00 | 15:00 | 30:00 | 38:00 | 1:16:00 |
| 2:05 | 15:38 | 31:15 | 39:35 | 1:19:10 |
| 2:10 | 16:15 | 32:30 | 41:10 | 1:22:20 |
| 2:15 | 16:52 | 33:45 | 42:45 | 1:25:30 |
| 2:20 | 17:30 | 35:00 | 44:20 | 1:28:40 |
| 2:25 | 18:08 | 36:15 | 45:55 | 1:31:50 |
| 2:30 | 18:45 | 37:30 | 47:30 | 1:35:00 |
| 2:35 | 19:22 | 38:45 | 49:05 | 1:38:10 |
| 2:40 | 20:00 | 40:00 | 50:40 | 1:41:20 |
| 2:45 | 20:38 | 41:15 | 52:15 | 1:44:30 |
| 2:50 | 21:15 | 42:30 | 53:50 | 1:47:40 |
| 2:55 | 21:52 | 43:45 | 55:25 | 1:50:50 |
| 3:00 | 22:30 | 45:00 | 57:00 | 1:54:00 |
The chart assumes perfectly even pacing and does not include time spent waiting before entering the water, running toward transition or removing a wetsuit.
Key takeaways
- A pace of 1:30 per 100 m produces a theoretical 1.9 km time of 28:30 and a 3.8 km time of 57:00.
- A pace of 2:00 per 100 m produces a theoretical 750 m time of 15:00 and a 1.9 km time of 38:00.
- A pace of 2:30 per 100 m produces a theoretical Half Ironman swim time of 47:30.
- Pool pace and open water pace should not be treated as automatically identical.
- Use a sustainable continuous pace rather than your fastest short interval when estimating a race time.
- Sighting, currents, waves and poor navigation can increase the distance you actually swim.
- Drafting and a well-fitted wetsuit may reduce the effort required to maintain a given speed.
- The best triathlon swim pace leaves enough energy for the bicycle and run.
How to use the swim pace chart
Find the pace you normally maintain per 100 metres and move across the row to the relevant distance.
For example, a swimmer maintaining 1:50 per 100 metres would theoretically complete:
- 750 metres in 13:45
- 1,500 metres in 27:30
- 1.9 kilometres in 34:50
- 3.8 kilometres in 1:09:40
The calculation is:
Pace per 100 metres × number of 100-metre sections
A 1.9 km swim contains nineteen 100-metre sections. At 2:00 per 100 metres:
19 × 2 minutes = 38 minutes
The chart rounds results to the nearest second where the distance does not divide evenly into complete minutes.
Triathlon swimming distances
The four distances used in the main chart correspond to common triathlon formats.
| Race format | Swim distance | Number of 100 m sections |
|---|---|---|
| Sprint triathlon | 750 m | 7.5 |
| Olympic triathlon | 1,500 m | 15 |
| Half Ironman | 1.9 km | 19 |
| Full Ironman | 3.8 km | 38 |
Some races use modified distances because of venue limitations, weather or local race formats. Always check the athlete information for the specific event.
Our complete guide to triathlon distances from sprint to Ironman explains the swim, bike and run distances for each format.
Sprint triathlon swim pace chart
A standard sprint triathlon normally begins with a 750 m swim.
Because the swim is relatively short, athletes can generally maintain a higher intensity than they would during a Half Ironman or full Ironman.
The opening pace should still remain controlled. Starting too aggressively can create breathlessness, poor navigation and unnecessary contact before a rhythm has been established.
| 750 m target time | Required pace per 100 m |
|---|---|
| 10:00 | 1:20 |
| 12:00 | 1:36 |
| 15:00 | 2:00 |
| 18:00 | 2:24 |
| 20:00 | 2:40 |
| 25:00 | 3:20 |
What is a good 750 m swim time?
A good 750 m time depends on experience, conditions and whether the swim takes place in a pool or open water.
A recreational triathlete completing 750 metres in approximately 15 minutes maintains a pace of 2:00 per 100 metres. A 12-minute swim requires approximately 1:36 per 100 metres, while a 10-minute result requires approximately 1:20.
The swim split should be judged as part of the complete race. Saving one minute in the water is not always beneficial when the effort makes the bike and run significantly harder.
Olympic triathlon swim pace chart
An Olympic-distance triathlon normally begins with a 1,500 m swim.
This is the same distance commonly used for a pool-based 1,500 m event, but open water conditions make direct comparisons difficult.
| 1,500 m target time | Required pace per 100 m |
|---|---|
| 20:00 | 1:20 |
| 22:30 | 1:30 |
| 25:00 | 1:40 |
| 30:00 | 2:00 |
| 35:00 | 2:20 |
| 40:00 | 2:40 |
What pace do you need for a 30-minute 1,500 m swim?
A 30-minute 1,500 m swim requires an average pace of exactly 2:00 per 100 metres.
A 25-minute swim requires 1:40 per 100 metres, while a 22:30 result requires 1:30 per 100 metres.
When training in a 25 m pool, a 2:00-per-100-metre pace means averaging approximately 30 seconds for every length, excluding rest.
Half Ironman swim pace chart
A Half Ironman or IRONMAN 70.3 begins with a 1.9 km swim.
The distance contains nineteen 100-metre sections. Every five seconds added to your 100 m pace changes the theoretical finishing time by approximately one minute and 35 seconds.
| 1.9 km target time | Required pace per 100 m |
|---|---|
| 25:00 | 1:19 |
| 30:00 | 1:35 |
| 35:00 | 1:51 |
| 40:00 | 2:06 |
| 45:00 | 2:22 |
| 50:00 | 2:38 |
| 55:00 | 2:54 |
| 1:00:00 | 3:09 |
What pace is a 30-minute Half Ironman swim?
A 30-minute 1.9 km swim requires an average pace of approximately 1:35 per 100 metres.
This is a strong recreational swim split and requires both speed and the ability to maintain efficient technique in open water.
What pace is a 35-minute Half Ironman swim?
A 35-minute Half Ironman swim requires approximately 1:51 per 100 metres.
The athlete must also account for navigation and the possibility of swimming farther than the advertised distance.
What pace is a 40-minute Half Ironman swim?
A 40-minute 1.9 km swim requires approximately 2:06 per 100 metres.
A swimmer who can maintain 2:00 per 100 metres continuously would theoretically finish in 38 minutes.
Learn more about the complete event in our guide to the Half Ironman swim, bike and run distances .
Ironman swim pace chart
A full-distance Ironman begins with a 3.8 km swim.
Maintaining pace over 3.8 km requires more than short-distance speed. Technique, endurance, navigation, pacing and the ability to remain relaxed become increasingly important.
| 3.8 km target time | Required pace per 100 m |
|---|---|
| 50:00 | 1:19 |
| 55:00 | 1:27 |
| 1:00:00 | 1:35 |
| 1:05:00 | 1:43 |
| 1:10:00 | 1:51 |
| 1:15:00 | 1:58 |
| 1:20:00 | 2:06 |
| 1:30:00 | 2:22 |
| 1:40:00 | 2:38 |
What pace is a one-hour Ironman swim?
A one-hour Ironman swim requires an average pace of approximately 1:35 per 100 metres.
Maintaining this pace for 3.8 km in open water requires strong aerobic fitness, efficient technique and accurate navigation.
What pace is a 70-minute Ironman swim?
A 1:10 Ironman swim requires approximately 1:51 per 100 metres.
A swimmer holding 1:50 per 100 metres would theoretically finish in 1:09:40.
What pace is a 90-minute Ironman swim?
A 1:30 Ironman swim requires an average pace of approximately 2:22 per 100 metres.
The appropriate target should remain comfortably within the relevant event cut-offs while also preserving enough energy for 180 km of cycling and a marathon.
Our analysis of the average Ironman time includes typical swim, bike, run and transition splits.
100 metre pace compared with 100 yard pace
Swimming pace may be displayed per 100 metres or per 100 yards.
One hundred yards is shorter than 100 metres, so the time per 100 yards will normally be lower even when swimming at the same speed.
| Pace per 100 m | Equivalent pace per 100 yd |
|---|---|
| 1:20 | 1:13 |
| 1:30 | 1:22 |
| 1:40 | 1:31 |
| 1:50 | 1:41 |
| 2:00 | 1:50 |
| 2:10 | 1:59 |
| 2:20 | 2:08 |
| 2:30 | 2:17 |
| 2:40 | 2:26 |
| 2:50 | 2:35 |
| 3:00 | 2:45 |
Do not compare a pace recorded in a yard pool directly with a pace recorded in a metre pool without converting the units.
How to calculate swimming pace
To calculate pace per 100 metres, divide your total time in seconds by the distance and multiply the result by 100.
The formula is:
Total time in seconds ÷ distance in metres × 100
Example: 1,500 metres in 30 minutes
Thirty minutes equals 1,800 seconds.
1,800 ÷ 1,500 × 100 = 120 seconds
A result of 120 seconds equals a pace of 2:00 per 100 metres.
Example: 1.9 km in 38 minutes
Thirty-eight minutes equals 2,280 seconds.
2,280 ÷ 1,900 × 100 = 120 seconds
The pace is again 2:00 per 100 metres.
Example: 3.8 km in 70 minutes
Seventy minutes equals 4,200 seconds.
4,200 ÷ 3,800 × 100 = approximately 110.5 seconds
This is approximately 1:51 per 100 metres.
How to estimate your open water swim time
Your pool pace provides a useful starting point, but it should not automatically become your predicted open water race pace.
Build the prediction from longer continuous swimming rather than one short and unusually fast repetition.
A practical process is:
- Identify your sustainable pace over a continuous pool swim.
- Use the chart to calculate the mathematical finishing time.
- Consider whether a wetsuit is likely to improve your body position.
- Add time for sighting, turns and potential navigation errors.
- Adjust for waves, current, temperature and expected congestion.
- Create an expected range rather than one exact prediction.
For example, a swimmer who can maintain 2:00 per 100 metres for a continuous 2,000 m pool swim has a theoretical Half Ironman time of 38 minutes.
A realistic prediction might instead be presented as a range of approximately 37 to 43 minutes, depending on the swimmer’s open water ability and the expected conditions.
Read our complete open water swimming guide for detailed advice about safety, sighting, breathing, drafting and wetsuits.
Why open water swim pace differs from pool pace
Open water swimming removes pool walls and lane markings while adding environmental variables.
Some factors slow the swimmer, while others may improve speed.
Sighting
Looking forward interrupts the normal stroke rhythm and can cause the legs to drop when the head is lifted too high.
Efficient sighting reduces this loss, but it still requires additional movement compared with following a line at the bottom of a pool.
Navigation
Swimming away from the shortest route increases the actual distance covered.
A watch may record more than the advertised distance because of navigation, GPS accuracy or the swimmer’s line around buoys.
Waves and current
Waves can disrupt breathing and stroke rhythm. Currents may help or oppose the swimmer depending on direction.
The same physical effort can therefore produce very different finishing times at different venues.
Wetsuit buoyancy
A well-fitted swimming wetsuit can raise the legs and improve body position.
Swimmers whose legs normally sit low in the water may experience a noticeable improvement, while efficient pool swimmers may gain less.
Drafting
Swimming behind or beside another athlete can reduce resistance and make a given speed easier to maintain.
The benefit is lost when the swimmer ahead follows an inefficient route, so navigation should still be checked independently.
Pool walls
Pool swimmers gain speed from each turn and push-off.
Strong push-offs can make a pool pace look faster than the equivalent continuous open water effort.
Continuous rhythm
Some swimmers perform better outdoors because they can maintain rhythm without turning every 25 or 50 metres.
The absence of walls is therefore not automatically a disadvantage for every swimmer.
How to choose a sustainable triathlon swim pace
The fastest pace you can maintain in isolation is not always the best pace for a triathlon.
The swim is followed immediately by cycling and running. An excessively hard effort can increase fatigue for a relatively small improvement in the swim split.
Use continuous training data
Use pace from longer repetitions or continuous swimming rather than your fastest 100 m.
A swimmer capable of one 1:30 repetition may not be able to hold anything close to that pace for 1.9 or 3.8 km.
Separate sprint pace from long-course pace
The appropriate pace changes with race length.
A sprint triathlon swim may be completed at a relatively high intensity because it lasts only 750 metres. An Ironman swim should feel controlled enough to preserve energy for the remaining race.
Allow time to settle after the start
Race starts can increase breathing rate and stroke frequency.
Begin with enough effort to establish position, but settle into your intended rhythm before the opening intensity becomes unsustainable.
Use effort as well as pace
A GPS watch may provide an estimated pace, but open water data can fluctuate.
Combine the watch with breathing, stroke rhythm and perceived effort rather than chasing every short-term change in displayed pace.
How to test your current swim pace
Different tests answer different questions.
Continuous distance test
Swim a continuous distance such as 400 m, 800 m, 1,000 m or 1,500 m at a controlled but strong effort.
Divide the result by the number of 100-metre sections to find your average pace.
A longer test generally provides a more useful long-distance prediction than one maximal 100 m.
Repeated 100 m test
Complete a series such as:
- 10 × 100 m
- 15 × 100 m
- 20 × 100 m
Use short and consistent recovery. Record whether the pace remains stable across the full set.
A pace that can only be maintained for the opening repetitions is unlikely to be a suitable long-course target.
400 m and 200 m test
Some swimmers use one maximal 400 m effort followed by a maximal 200 m effort after sufficient recovery to estimate critical swim speed.
Critical swim speed can then help structure threshold-oriented training, but it should still be adjusted for race distance and open water conditions.
Swimming training paces
One race target should not be used for every pool session.
Different training intensities develop different abilities.
| Training intensity | Typical feeling | Purpose |
|---|---|---|
| Recovery | Very relaxed | Warm-up, cool-down and easy technique work |
| Easy aerobic | Comfortable and sustainable | Endurance and efficient repetition |
| Steady | Controlled with purposeful effort | Longer aerobic intervals |
| Threshold | Hard but repeatable | Improve sustainable swimming speed |
| VO2-oriented | Hard with significant breathing | Shorter high-intensity intervals |
| Sprint | Very fast and brief | Speed, power and technique at high velocity |
Most sessions should not be completed as continuous race simulations.
Easy technique work, controlled endurance and structured faster intervals all contribute to improved race pace.
How to improve your swimming pace
Improve body position
A low head, stable trunk and elevated legs reduce the frontal area moving through the water.
Lifting the head unnecessarily can cause the hips and legs to sink.
Develop a stronger catch
The catch establishes a useful position from which the arm can move the body forward.
Avoid pressing directly downward or allowing the elbow to collapse during the pull.
Reduce unnecessary resistance
Crossing the centre line, excessive kicking, poor alignment and unstable rotation can all increase resistance.
Technical improvements may therefore increase speed without requiring a proportional increase in physical effort.
Complete consistent aerobic training
Long-distance swimming requires the ability to maintain technique after several hundred or several thousand metres.
Include longer repeats and continuous swimming rather than relying only on short, fast intervals.
Use threshold intervals
Threshold-oriented sets can improve the fastest pace you can maintain consistently.
An example could be:
- 400 m easy warm-up
- 6 × 50 m technique drills
- 10 × 100 m at controlled threshold effort
- 15–20 seconds of recovery between repetitions
- 300 m easy cool-down
The pace should remain repeatable. Beginning too quickly and slowing on every repetition reduces the quality of the session.
Practise open water skills
Pool speed does not remove the need for sighting, navigation, group swimming and adapting to conditions.
Open water skills allow more of your physical fitness to appear in the final race result.
Common mistakes when using a swim pace chart
Using your fastest 100 m as your long-distance pace
A maximal 100 m result measures speed, not the pace you can sustain for 1.9 or 3.8 km.
Ignoring rest between repetitions
Ten 100 m repetitions completed with substantial rest are not equivalent to a continuous 1,000 m swim.
Assuming open water will match the pool exactly
Open water introduces navigation and environmental variables, while a wetsuit and drafting may provide benefits.
Forgetting the actual distance swum
Poor navigation can turn a 1.9 km course into a meaningfully longer swim.
Chasing pace during every session
Technique and recovery sessions may intentionally be slower than race pace.
Ignoring pool length
A pace from a 25-yard pool should not be labelled as pace per 100 metres without conversion.
Choosing an unrealistic race target
A target should reflect recent continuous training and open water experience rather than an ideal finishing time.
Frequently asked questions about swim pace
What is a good swimming pace per 100 metres?
A good pace depends on experience, stroke efficiency and distance. For one swimmer, maintaining 2:15 per 100 metres continuously may represent major progress, while a competitive swimmer may hold considerably below 1:30.
Is two minutes per 100 metres a good pace?
Yes. Maintaining 2:00 per 100 metres continuously is a useful recreational pace and produces a theoretical 38-minute Half Ironman swim.
What is a fast 100 m swim time?
A fast result depends on age, experience and whether the swim begins from a dive or push. A single fast 100 m should not be used directly as a prediction for a long open water event.
How long does it take to swim 750 metres?
At 1:30 per 100 metres, 750 metres takes approximately 11:15. At 2:00 pace it takes 15:00, and at 2:30 pace it takes 18:45.
How long does it take to swim 1,500 metres?
At 1:30 per 100 metres, 1,500 metres takes 22:30. At 2:00 pace it takes 30:00, and at 2:30 pace it takes 37:30.
How long does it take to swim 1.9 km?
At 1:30 per 100 metres, 1.9 km takes 28:30. At 2:00 pace it takes 38:00, and at 2:30 pace it takes 47:30.
How long does it take to swim 3.8 km?
At 1:30 per 100 metres, 3.8 km takes 57:00. At 2:00 pace it takes 1:16:00, and at 2:30 pace it takes 1:35:00.
What pace is a 40-minute Half Ironman swim?
A 40-minute 1.9 km swim requires approximately 2:06 per 100 metres.
What pace is a 60-minute Ironman swim?
A one-hour 3.8 km swim requires approximately 1:35 per 100 metres.
What pace is a 70-minute Ironman swim?
A 70-minute Ironman swim requires approximately 1:51 per 100 metres.
What pace is a 90-minute Ironman swim?
A 90-minute 3.8 km swim requires approximately 2:22 per 100 metres.
Is open water swimming slower than pool swimming?
It can be slower because of sighting, waves, current and navigation. It can also be faster for some swimmers because of wetsuit buoyancy, drafting and continuous rhythm without turns.
How much slower should my race pace be than my 100 m pace?
There is no fixed difference. It depends on whether the 100 m pace came from a maximal effort, a repeatable interval set or a continuous swim.
Does a wetsuit make swimming faster?
A well-fitted swimming wetsuit can improve buoyancy and body position. The individual benefit depends on technique, suit fit and conditions.
Does drafting improve swim pace?
Drafting can reduce the effort required to maintain speed when performed correctly. The swimmer should still navigate independently.
How accurate is a swim pace chart?
The mathematical calculations are accurate when the same pace is maintained over the exact distance. The prediction becomes less certain when applied to changing open water conditions.
Final thoughts
A swim pace chart provides a simple way to convert pace per 100 metres into an estimated finishing time.
The calculations show that:
- 2:00 per 100 m equals 15:00 for 750 m
- 2:00 per 100 m equals 30:00 for 1,500 m
- 2:00 per 100 m equals 38:00 for 1.9 km
- 2:00 per 100 m equals 1:16:00 for 3.8 km
Use these figures as a starting point rather than a guaranteed race prediction.
Your actual result depends on how long you can sustain the pace, the distance you truly cover and the conditions encountered during the swim.
The most useful target is not simply the fastest imaginable split. It is a pace that allows you to swim efficiently, navigate accurately and complete the remaining disciplines of the race effectively.
Continue exploring
- Open Water Swimming: Complete Guide to Technique, Safety and Training
- Triathlon Distances Explained: Sprint, Olympic, 70.3 and Ironman
- Half Ironman Distance: Swim, Bike and Run Explained
- What Is a Good Triathlon Time?
- Average Ironman Time by Age, Gender and Discipline
- Explore all Triathlon Loop swimming guides
