Both can mean "quality," but are used in different senses. "Calidad" can also have many other translations, and is by far the more common of the two words. "Calidad" can mean quality as in the quality of a product or service (high quality clothing or a poor quality of education). It can also indicate in or under what condition someone participated in an event or transaction: "Mi amigo me representó en calidad de abogado." "Calidad" can also express the concept of the perceived "quality" of people in general: "Me gusta rodearme de personas de calidad." "Cualidades" (pl.) refers to those qualities that are immanent in something, and distinguish it from everything else. It can also refer to qualities as positive attributes of someone's personality: "Esa mujer tiene muchas cualidades, y por eso ella me cae muy bien."

calidad es el nivel de capacidad las cosas mientras cualidad es una caracteristica muy buena del objeto , persona o animal...

Calidad and cualidad are both cognates of the English word quality but have different meanings. Calidad: quality as in a mesure of worth. Exemple: Todo depende de la calidad de los materiales. Everything depends on the quality of the materials. Cualidad: quality as in a characteristic of a person or thing. Exemple: Su dedicación es la cualidad que más admiro en él. His dedication is the quality I most admire in him.

¿Cuál es la diferencia entre calidad y cualidad? o ¿Qué diferencias hay entre calidad de cualidad?