Swim Split Calculator

1. Enter the total distance of your swim.
2. Enter your target finish time as minutes and seconds.
3. Choose the split length: 25, 50 or 100 metres.
4. Read the even split time you must hold, and the pace per 100.

An even split, or splitting evenly, means swimming each part of a distance in the same time. If you want a target finish time, dividing it equally across the lengths gives the pace you must hold on every split to get there.

Even splitting is the most efficient way to race a distance swim. Going out too fast and fading, or starting slow and sprinting, both waste energy. A steady split from start to finish usually gives the best overall time. Knowing your even split turns an intimidating race target into a single, repeatable number: instead of worrying about the whole distance, you only ever have to hit one time on the next length, over and over, until the swim is done.

1. Divide the total distance by the split length for the number of splits.
2. Divide the target time by that number for the even split time.
3. The pace per 100 is the target time divided by the distance, times 100.
4. Hold the split time on every length to hit the target.

Because every split is equal, keeping to the split time is a simple way to pace a race without doing the maths in your head mid-swim.

You want to swim 400 metres in 6 minutes 40 seconds, which is 400 seconds. In 50 metre splits there are eight splits, so each must take 400 divided by 8, which is 50 seconds. In 100 metre splits there are four, each 1 minute 40 seconds. Either way the pace per 100 is 1 minute 40, and holding that split every length delivers the target. The choice of split length is purely about how often you want feedback: 25 metre splits give a checkpoint at every wall, while 100 metre splits are easier to remember but let more drift creep in before you notice you are off pace.

Target Time

A faster target means faster splits; the split time scales directly with the goal.

Split Length

Shorter splits give more frequent, smaller checkpoints; longer splits are easier to track.

Pacing Strategy

Even splits are efficient, but some races use a slightly faster first or last split.

Turns and Fatigue

Real splits drift with tiredness and turns, so aim to hold the even split as closely as you can.

Even 50 metre splits for common targets.

Knowing your even split turns a big target into a single number you can check off every length.

Racing a Target

Work out the split to hold for a personal best or a qualifying time.

Pacing a Set

Set even splits for a training swim to build a feel for pace.

Checking Progress

Compare your real splits against the even split to see where you fade.

1. Going Out Too Fast

A quick first split feels good but usually leads to a big fade and a slower overall time.

2. Ignoring the Count

Make sure the distance divides cleanly by the split length, or the last split differs.

3. Forgetting Turns

Wall push-offs affect split times, so a pool split is not the same as an open-water one.

4. Chasing Exact Splits

Aim for the even split as a guide; a second either way over a length is normal.

The split maths is exact for the target and split length you enter. It gives an even split, not a race-specific pacing plan.

Divide the distance by the split length for the number of splits, then divide the target time by that. 400 m in 6:40 over 50 m splits is 0:50 each.

Swimming each part of the distance in the same time. It shares your target time equally across every length or split.

Even splitting is usually the most efficient, avoiding a fast start and big fade. Some racers use a slightly faster final split.

Eight. A 400 metre swim is eight 50 metre splits, or four 100 metre splits.

Swimming the second half faster than the first. This tool gives even splits; a negative split needs a deliberate plan.

It changes how often you check your pace, not the total. Shorter splits give more frequent, smaller checkpoints.

Fatigue, turns and pacing all cause real splits to drift. Aim to hold the even split as closely as you can.

Enter your target time, read the even split, and practise holding it every length until it feels natural.

No. The calculator runs entirely in your browser and nothing you enter is stored or sent anywhere.

• Swimming (sport) (Wikipedia).
• Racing and pacing (Wikipedia).
• Split (racing) (Wikipedia).