Multiply the number of carats by 0.007054 to convert to ounces. For example, if you have 10 carats, multiply 10 by 0.007054 to get 0.07054 ounces.
Divide the number of carats by 141.7635384179189 to convert to ounces. In this example, check your answer by dividing 10 by 141.7635384179189 to get 0.07054 ounces.
Check your answer using an online carats-to-ounces calculator. Enter the number of carats and press "Go" and the number of ounces will be displayed.