Plan a pacing strategy for 5K, 10K, half marathon, and marathon. This reshapes your splits while keeping your total time the same, so you can compare even pacing vs a stronger finish.
Calculator
Set distance, time, split size, and negative split slider.
Strategy
How to pace each distance without blowing up.
FAQ
Quick answers + common mistakes (great for race day).
A negative split usually means you start controlled, settle quickly into rhythm, then gradually press the last third. The goal isn’t “slow start” — it’s fast-but-relaxed early so you don’t spike effort.
It reshapes split times from start → finish, then re-normalizes so your total time stays identical. Negative values make early splits a little slower and late splits faster (stronger finish).
For most races, start small: try -4% to -10% first. Huge negative splits usually mean you started too slow or you’re guessing wrong on fitness.
Not always — but it’s a great “default plan” because it reduces blow-up risk. In tactical races, you may need to respond to moves, hills, wind, and positioning.
Treating the first mile like a sprint. Smooth-fast early + strong late beats “hero start, survival finish.”