it's calculated the same as it was on the last map, which by the way, is BASE * SQRT(q/10)
edit: so the thing about them only increasing at q40, q90, q160, etc is not true and never was
example
let's say a militia sword does base 10 damage and is q20, so it does 10 * sqrt(20/10) or 10*1.414 or 14 damage. of course then it is also effected by your strength.