Practice inputs
Positive decimal seconds for each measured split. This calculator uses first movement to 30m and a flying 10m segment.
Positive tailwind, negative headwind, explicit 0 for still air. Blank wind stays unknown.
Reaction is added separately. The 0.149 s default is an illustrative assumption; 0 is allowed for a comparison without an added reaction.
Try split examples
Illustrative input pairs, not verified athlete results. Each resets wind to 0 and reaction to 0.149 s.
100m model scenario
Illustrative scenario · block 30m 4.00 s · fly 10m 1.00 s.
Wind 0 m/s · reaction assumption 0.149 s.
Model comparison only. Individual race accuracy is uncertain.
Timing assumptions
Use a consistent measured segment and start method. Reaction is separate from the first-movement block split in this calculator. A generic official hand-time offset does not establish a correction for a practice split.
Read the expression
Base = exp(c₀ + c₁ × block30 + c₂ × (10 ÷ fly10)). The scenario is base − (w₀ × wind + w₁ × wind × base + w₂ × wind²) + reaction.
Base coefficients: 2.2441850962837124, 0.14735859276138946, -0.042918544171317706. Wind coefficients: -0.0449, 0.009459, -0.0042.
Before two-decimal display rounding: 11.22116195 s (10 significant digits). Display precision does not establish model accuracy.
No calibration dataset is supplied with the existing exponential fit, so its accuracy across athletes and practice protocols is uncertain. The wind term follows Moinat et al. (2018); that paper is not validation of this separate practice-split fit.
The selected wind and reaction assumptions do not certify start or record eligibility. Keep measured splits, timing method and actual race marks together when reviewing progress.