About this calculator
Use it to track improvement or to plan sets.
How to use it
- Enter the distance in metres.
- Enter your time.
- Choose the pool length.
The formula
Pace per 100 m = time ÷ distance × 100
- distance
- in metres
- pool length
- 25 m or 50 m
Worked example
1,500 m in 30 minutes, 25 m pool
- Pace = 30:00 ÷ 1500 × 100 = 2:00 per 100 m.
- That is 60 lengths, 0:30 each.
What the result means
A pace of 2:00 per 100 m is steady for adult fitness swimmers.
Assumptions
- Even pace.
Limitations
- Turns and push-offs make pool pace faster than open water.
Frequently asked questions
What is a good swimming pace?
About 2:00 to 2:30 per 100 m is common for adult fitness swimmers.
How many lengths is 1 km?
40 in a 25 m pool, 20 in a 50 m pool.
Is open water slower?
Usually, because there are no walls to push off.
Not medical advice. This calculator is a general screening tool and cannot diagnose any condition. Results are estimates. Please talk to a doctor or a qualified health professional about your health and before making changes to diet, exercise or treatment.
Last reviewed on 1 October 2026. Found a mistake? Tell us.