These are the basic quantified values of Servants' parameters. Note that even the E Rank parameter is already above what an ordinary human can achieve.
For Noble Phantasms, + modifiers represent the capacity of a temporary boost of power if certain conditions are met. + means a two-times increase, ++ a three-times increase and +++ a four-times increase.
An A++ Rank Noble Phantasm is said to be a mystery on the level of Divine Spirits.
A C Rank Noble Phantasm is equivalent in power to a A Rank normal attack.
An A Rank Magecraft is already on the level of High-Thaumaturgy. Magecraft of A+ Rank is said to be almost at the level of Magic
An EX Rank represents a value that cannot be quantified under the rules shown above.
Link for more info and verification: http://typemoon.wikia.com/wiki/Parameters_and_Skills
