Enter an event mark
Choose the event before entering its mark. Changing the event clears the mark so units and event results stay distinct.
Decimal seconds, such as 12.20. Minute clocks are not accepted. Blank or malformed values clear both estimates.
Use the published reading: positive tailwind, negative headwind, or explicit 0 for still air. Blank wind stays unknown.
Still-air mark
Illustrative example: 100m · 9.58 s · +2 m/s.
Modeled at 0.0 m/s.
At +2.0 m/s
Still-air minus recorded: +0.075 s.
These are model scenarios. Keep the recorded mark and reported wind for eligibility checks.
Read the two marks
Benefit = c₀ × wind + c₁ × wind × mark + c₂ × wind². Still-air time adds that benefit. For 100m: c₀ = -0.0449, c₁ = 0.009459, c₂ = -0.0042.
The +2.0 m/s scenario inverts the same relation. For 100m, mark is part of the wind term, so its inverse solves the linear equation rather than mirroring a correction.
Calculated values before the two-decimal display: still-air 9.654634440 s; +2.0 m/s 9.580000000 s (10 significant digits). Display precision does not establish prediction accuracy.
Moinat et al. (2018) provide the statistical model. Individual response and extrapolation remain uncertain.
Keep eligibility separate
The +2.0 label is a modeled wind condition. World Athletics rules and your meet’s governing rules set the applicable wind, timing and measurement requirements; special event and qualification provisions can differ. These estimates do not certify record eligibility.