An AFL field does not have one fixed length, but there is a standard range used at senior level: it is typically between 135 and 185 metres long, and 110 to 155 metres wide.

In practice, many elite AFL grounds sit somewhere in the middle of that range. A commonly cited “ideal” or preferred size for a full‑size senior oval is about 165 metres long by 135 metres wide, which gives room for open play without making the ground excessively large. For example, the Melbourne Cricket Ground (MCG) – the most famous AFL venue – is about 161 metres by 138 metres, which fits neatly inside those standard limits.

So if you’re just after a quick rule of thumb for “how long is an AFL field?”, you can say: an AFL ground is roughly 160–170 metres long, but by the laws of the game it can legally be anywhere from 135 up to 185 metres in length.

Information gathered from public forums or data available on the internet and portrayed here.