# [RPG] n Ability Modifier equation

ability-scorespathfinder-1e

Is there an equation to determine the Ability Modifier?

I'm not talking about the chart that lists

• 1 = −5
• 2-3 = −4
• 4-5 = −3
• 6-7 = −2
• etc.

I mean a legit equation that, if I somehow misplaced this information, I could determine what the modifier is based on the score?

$$\frac{\mathrm{ability} - 10}{2}$$