To simplify this when calculating Gear Score, we use: Flat ATK ÷ 10 = ATK% for the average hero. A max roll of 42 Flat ATK roll is equivalent to around 4% ATK, or 4 GS. Flat HP ÷ 50 = HP% for the average hero. A max roll of 202 Flat HP is equivalent to around 4% HP, or 4 GS.