This document specifies the basic formulae for the calculation of the surface durability (macropitting) of straight and helical bevel gears, Zerol, spiral bevel and hypoid gears and includes all influences on the macropitting load capacity that can be assessed quantitatively. This document applies to oil lubricated bevel gears as long as sufficient lubricant is present in the mesh at all times. The formulae in this document are based on virtual cylindrical gears and are limited to bevel gears whose virtual cylindrical gears have a transverse contact ratio of <(Index)va>< 2. The formulae in this document are not directly applicable to the assessment of other flank damage, such as plastic deformation, scratching and scuffing.