Every split table starts as arithmetic and ends as a record. The gap between the two deserves a careful read, because the honest conclusion is usually narrower — and more useful — than either self-congratulation or self-criticism.
What the plan actually promised
A split table promises one thing: if you run the target pace evenly (or in whatever distribution you modeled), the clock will read these numbers at these points. It says nothing about whether the target suits your current fitness, the course profile, the weather, or how the first 10 minutes of crowding will feel. The race split calculator is explicit about this: results calculate a pacing scenario from your inputs; they do not predict your fitness or guarantee that a target is achievable.
Reading the gap after the race
Compare your actual cumulative times with the planned ones, marker by marker. Three patterns cover most outcomes:
- Uniform drift. Every marker is off by roughly the same growing amount. The plan was internally consistent; the pace itself was misjudged. Feed the achieved time back into the pace calculator and rebuild the table around reality.
- Early lag, late catch-up. The first markers are behind plan and later ones recover it. Crowding, caution on hills, or a deliberately conservative start produce this shape. If it happens repeatedly, model it explicitly with the negative split calculator instead of hoping an even table fits.
- Early surplus, late collapse. Ahead of plan early, then falling behind. The arithmetic of the table was fine; the distribution was not sustainable. A positive-q or more conservative plan is worth comparing next time.
Keep the rounding in perspective
Displayed split times are rounded to the whole second, so single-second differences between segments are noise. Cumulative gaps of five seconds or more at a marker are usually signal. Judging a race on 1-second segment wobbles is reading the display, not the run.
Feeding one race into the next plan
The clean loop is: record the finish time, recompute pace and splits from that exact number, and adjust the next target by a margin you can defend — not by what felt good in the last kilometer. Keep using exact values from one tool to the next (the pace calculator hands its values to the split planner directly), because every re-typed, rounded number is a fresh chance to drift.
The calculator's job ends at the arithmetic. Deciding what the numbers mean for training, health or goals belongs to you, and where it matters, to a coach or medical professional who can see the whole picture.