Among the world's owls, it ranks as the fifth heaviest on average, the seventh longest in length and measured wing chord and fourth longest in mean wingspan, although not all large species have had measured wingspans.[4][5] It measures 51–63 cm (20–25 in) in length, spans around 153 cm (60 in) across the wings and weighs up to at least 2.35 kg (5.2 lb).[6][7] One male was found to weigh 1.72 kg (3.8 lb) and four females averaged 2.19 kg (4.8 lb), it may outrival the snowy owl (only around 4% lighter on average in six datasets) as the fifth or sixth heaviest living owl on average.[8][9] Under current classification, it is the heaviest extant owl outside of the genus Bubo, although some authors may also include the fishing owls in Bubo.[10] Among standard measurements, the wing chord is 40.7–44.7 cm (16.0–17.6 in) and the tail is 20.7–24.3 cm (8.1–9.6 in) long.