Correct spelling


Correct spelling, explanation: this spelling is correct, since the word is based on the verb to stand, to which we added a noun. Standard supposedly comes from Frankish standhard, which is a compound of stand and hard (originally the word meaning was a pole used for military sources, for example for a flag). These facts point to standard as a correct form. Standart is incorrect.

Definition of standard:
adjective, accepted as basic (for example a unit of measurement)
This is a standard weight for a newborn.
noun, something considered the most basic, usual, common; a rule given by some authority
These t-shirts are standards in every summer collection.
According to the school standards you shouldn’t wear make-up for lessons.

Incorrect spelling


Incorrect spelling, explanation: this form is a mistake, because the word standard comes from French word describing a military pole and was probably turned into Frankish standhard (stand and hard). Thus, it should end with a d, not t. Standart is then wrong and the correct form is standard.