Minecraft wiki entry for Levels, associated text: The minimum values are all calculated using a linear function y = kx+m where y is the calculated minimum value, x is the current enchantment power level and k and m varies between different enchantments. The maximum values can either be: the enchantment's minimum value plus a constant, the default minimum value of a generic enchantment plus a constant, or a constant level. All values obtained from 1.14.4 source code.