The answer you're looking for is typically associated with a musical score context. A quarter note usually represents 1 beat in 4/4 time signature. If you're looking to quantify a combination of quarter notes and possibly something else, please clarify your question! However, if you're just trying to convert the quarter note to beats, then:
Quarter note = 1 beat
If you're referring to something that adds to the quarter note, please let me know the context!