Convert Between New ECF Ratings and Old ECF Grades This little tool enables you to input an old-style ECF grade and see the new ECF rating equivalent, or vice versa. In accordance with the ECF's guidance, the conversion formula is 7.5 x (old grade) + 700 = new rating. Which way do you want to convert?: From old grade to new rating From new rating to old grade Input: Either a 3-digit old-style grade or a 4-digit new-style rating. Submit