Even vs Negative Splits: How to Pace Your Race

A split is your time for one segment of a race — usually each kilometre or mile. How those splits rise or fall across the race tells the story of your pacing, and getting them right is often the difference between a personal best and a painful fade.

Even splits

Even splits mean running every segment at roughly the same pace. For most runners and most distances, this is the most efficient way to race: it avoids the early surge that drains your legs and leaves you nothing for the finish. If your goal is a specific finish time, even splits are the simplest plan to execute.

Negative splits

A negative split means running the second half faster than the first. It's the hallmark of a well-judged race: you start controlled, settle in, then gradually press as you gain confidence. Many world records and personal bests are run this way because it banks energy early and spends it when it counts.

Positive splits — the fade

A positive split is the opposite: the second half is slower, usually because the runner went out too hard. A small positive split happens to almost everyone in long races, but a large one is the classic sign of over-ambitious early pacing. The cure is almost always starting more conservatively.

How to plan your splits

• Pick a realistic goal time (a race predictor helps).
• Work out the even-pace split for each km or mile.
• For a negative split, aim a few seconds per km slower than goal pace early, then a few seconds faster late.
• Write the splits on your hand or set your watch — and resist the urge to bank time early.

Get your splits

Enter your goal time and distance into the splits calculator to get the exact per-km or per-mile splits to aim for, and use the pace calculator to double-check the pace behind them.