User blog comment:UnknownGeneralHero/Aura in relation to physical prowess/@comment-5780397-20160217224728

Strength depends entirely on the individual. Biscuit defeated Bara and Binolt without using Nen, and we saw how strong she is. Hisoka did not use Nen during the Hunter Exam. Mizuken's explanation shows that, except when a Limitation is involved, physical strength and aura are more or less equally important in offensive power. The rest is up to 1- how much aura a user can release at once and 2- how well they can control it wasting as little as possible (Knuckle's lesson to Gon).

The closest thing to a quantification is Biscuit's demonstration of Ko. Just by touching Killua, she made his nose bleed (so basically she hurt him with aura alone, although that might not have been her full power, and surely was not her full brawn).