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🏃 Fitness & Health · Rex's Toolbox

Swim Pace Calculator

Pace per 100, total time, and split targets for any swim distance.

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Rex says

Same equations the textbooks use — just way less awkward. Pop in your stats and I'll tell you what the number actually means for you.

Try a scenario

Click to load — tweak from there.

Inputs

Result

Pace per 100 (seconds)

112.5

Pace per 50 (seconds)

56.3

Projected target time (min)

28.13

Pace per 100 (minutes)

1.88

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How to use this

  1. 1Enter distance swum (m/yd).
  2. 2Enter time (min).
  3. 3Enter seconds.
  4. 4Enter target race distance (m/yd).
  5. 5Read your pace per 100 (seconds) on the right — it updates as you type.
  6. 6Hit Share to keep the scenario or send it to someone.

About this calculator

Convert a swim time into pace per 100 yards or meters, project total time for a target distance, and get the interval splits to hold in the pool.

FormulaPace per 100 = time ÷ (distance ÷ 100).

Worked example

Using the values the calculator loads with:

Inputs

  • Distance swum: 400 m/yd
  • Time: 7 min
  • Seconds: 30
  • Target race distance: 1500 m/yd

Results

  • Pace per 100 (seconds): 112.5
  • Pace per 50 (seconds): 56.3
  • Projected target time (min): 28.13
  • Pace per 100 (minutes): 1.88

What each field means

Inputs

Distance swum (m/yd)
The distance swum used in the calculation, measured in m/yd. Starts at 400 m/yd so you have a working example on load.
Time (min)
The time used in the calculation, measured in min. Starts at 7 min so you have a working example on load.
Seconds
The seconds used in the calculation. Starts at 30 so you have a working example on load. Accepted range: 0–59.
Target race distance (m/yd)
The target race distance used in the calculation, measured in m/yd. Starts at 1500 m/yd so you have a working example on load.

Results

Pace per 100 (seconds)
Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Pace per 50 (seconds)
Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Projected target time (min)
Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Pace per 100 (minutes)
Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.

FAQ

Yards or meters?

Either — the math is the same. Just don't mix them: 100 m is about 9% longer than 100 yd.

Will I hold this pace for 1500?

Most swimmers fade 3–8% over a long swim relative to a 400 pace. Treat the projection as the optimistic end.

Accuracy and limitations

  • Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.
  • Results do not account for medical conditions, medication, or pregnancy.
  • Use this as a directional reference, not a diagnosis — talk to a clinician before acting on it.

Cite this calculator

Writing about this topic? Grab a citation — every link helps keep these tools free.

APA
RevenueLab. (2026). Swim Pace & Split Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/swim-pace
HTML
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/swim-pace" target="_blank" rel="noopener">Swim Pace & Split Calculator — RevenueLab</a> (2026).</p>
Markdown
Source: [Swim Pace & Split Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/swim-pace) (2026).
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