Wind-legal, wind-aided, NWI: what the number next to your sprint actually means

July 29, 2026 · 6 min read

Every sprinter has had this conversation. You run a personal best, you are thrilled, and somebody standing near the finish line says "yeah, but what was the wind?"

It is worth understanding properly, because it decides whether the fastest time you have ever run counts for anything beyond the memory.

The +2.0 rule

For record and ranking purposes, a following wind of more than 2.0 metres per second makes a mark wind-aided. Not invalid, not fake, just not comparable. The performance happened. It goes on your season list and in your own head as the fastest you have moved. It does not go on a rankings list, and it will not be ratified as a record.

Two metres per second is about 4.5 miles per hour. That is a light breeze. It is entirely possible to run a legal race in what feels like meaningful wind, and it is equally possible to have a 2.1 reading on a day that felt still.

The number is also a single reading taken over a specific window, not an average of conditions across the whole race. In the 100m the gauge runs for 10 seconds from the gun. In the 200m it runs for 10 seconds from when the leader enters the straight, which is why a 200m wind reading tells you about the home straight and nothing about the bend.

Which events it applies to

This surprises people. Wind is only measured, and only matters, for:

• 100m and 200m
• 100m and 110m hurdles
• Long jump
• Triple jump

That is the whole list. It does not apply to the 400m, any distance event, the 400m hurdles, or any throw or vertical jump. The reasoning is straightforward: those events either run round a full lap, so a tailwind on the back straight is a headwind on the home straight, or the implement and the athlete are not meaningfully helped by a following breeze in a way that can be isolated and measured.

So if you see a wind figure attached to a 400m time or a shot put, something has gone wrong in the data entry. On TrackReels the wind field only appears for the six events above, precisely so that cannot happen.

What NWI means

NWI stands for no wind indication. It means no gauge reading was recorded for that performance. It is not the same as zero wind, and this distinction matters more than most athletes realise.

A mark of 10.71 with a recorded 0.0 tells a coach the conditions were neutral and the performance is directly comparable. A mark of 10.71 with NWI tells a coach nothing about the conditions at all. It might have been still. It might have been a gale. Nobody measured, so nobody knows.

Plenty of legitimate meets do not have a working gauge, particularly smaller invitationals and early-season fixtures. NWI is not a mark of shame. But leaving the field blank and hoping it reads as "no wind" is a mistake, because a coach reading your profile will either assume the worst or, more likely, discount the mark entirely rather than guess.

Say NWI. It is honest, it is standard, and it is what every recruiting coordinator expects to see.

Why hand timing changes the conversation too

While we are on the subject of numbers that need context: a hand-timed sprint and a fully automatic timed sprint are not the same measurement.

FAT means the clock started with the gun and stopped when your torso crossed the line, electronically. Hand timing means a person pressed a button. Human reaction time at the finish tends to make hand times faster than reality, which is why the widely used convention is to add roughly 0.24 seconds to a hand-timed sprint before comparing it to a FAT mark.

A 10.9 hand is not a 10.9. It is somewhere around an 11.14 in FAT terms. Coaches know this. They will apply the conversion whether or not you tell them, so the athletes who label their marks honestly lose nothing and gain credibility.

What this means for your profile

The practical version, if you take nothing else from this:

1. Record the wind when there is a reading. Record NWI when there is not.
2. Never label a hand time as FAT. It will be found out, and it costs you more than the 0.24 ever would.
3. Do not delete your wind-aided marks. They show what you are capable of on a good day, and a coach reading "10.68w (+3.1)" alongside a legal 10.94 learns something real about your ceiling.
4. Link the official results wherever they exist. A mark with a results link attached ends the conversation before it starts.

Rankings on TrackReels are built from wind-legal marks only, and wind-aided performances are labelled rather than hidden. That is deliberate. The alternative, where every mark sits in an undifferentiated list, means the honest athletes are quietly punished for being honest.