Incorrect spelling, explanation: suffix -able is generally used with words that, without a suffix, are in their full form (just like understandable without the suffix is understand – we don’t change anything). Convert is such word, but it is an exception. Since its Latin-origin word we use suffix -ible with it, so convertible is the correct form.
Correct spelling, explanation: usually with Latin-origin words we use suffix -ible when creating an adjective. Convert is one of such words, so convertible is the correct spelling. It is sometimes said that suffix -able is added to words that are left full without the suffix (such as depend → dependable), and this is generally true, so that may be why the confusion with
convertable exists, however this rule has exceptions, and convertible is one of them.
Definition of convertible:
adjective, something adaptable, able to be changed
Look how convenient this convertible bag is – it can be a handbag or a backpack!
noun, a type of car with roof that folds
Joe was planning to buy a coupé, but finally he has bought a convertible.
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