This tool breaks your race or training session into manageable chunks and allows you to plan ahead by quickly showing split times.

How it Works

1. Choose or enter a distance. You can select a preset race distance (5k, 10k, half marathon, or marathon) or enter your own custom distance in miles or kilometers.
2. Pick and entry mode.You can choose to enters a run finish time, or a per-split time.
3. Enter finish or split time. Specify hours, minutes, and seconds.
4. Choose of enter your split unit.Choose from preset mile splits, kilometer splits, or enter a custom split distance in miles or kilometers

The calculator will give you a one-line summary of your race/session and display a table of cumulative lap split times and distance.

You can change any of your input values and the summary and table will instantly update.

You can use our split calculator ahead of a race or training session so you know exactly what time to hit each marker.

Types of splits

Even splits

This simply means running each split at the same average pace.

Negative splits

A negative split means running the second half of a race faster than the first. This is typically the best strategy for longer distances such as the 10k, half marathon, and marathon. It helps you conserve energy early on, avoid hitting the wall, and finish strong with your fastest running in the closing stages.

Positive splits

A positive split is when the first half is quicker than the second. While risky in long races, it's often the most effective approach for middle-distance events such as the 800 metres, where athletes go out hard and aim to hold on. For these shorter races, a fast start can be the key to achieving a personal best.

Why even splits matter for distance running

Most runners perform best when they run at a steady pace from start to finish. Even splits make the most efficient use of energy and reduce the risk of burning out.

Data from world records and major marathons shows that, for long-distance events, the fastest times almost always come from even pacing.

By knowing your exact split times in advance, you give yourself the best chance of holding a consistent pace and finishing strong.

If you're training specifically on the track, then our track split calculator will probably better serve your needs. As well as showing cumulative split times, it also accounts for different distances of lanes 1–8.

Once your splits are established, then you can print out a pace band.

If you're curious about different representations of paces and speeds then take a look at our pace/speed conversion tool.