How do you calculate the value of "+(x) Melee Strike Range"?

Title. Is it a value unique to itself, is it a value determined by the weapon type you have equipped or unarmed strikes, or what?

I see there are a lot of things that randomly grant bonus melee strike range but I have no clue how to calculate the value and strength of that relative to what I am doing. Is it just not detailed anywhere in the game?