What was the size of West 1857 graduating class?

There's no single, universally agreed-upon "West Point" graduating class of 1857. The United States Military Academy at West Point didn't always have a single graduating class each year; there could be multiple classes graduating in the same year depending on the length of their program. To find the size of a specific graduating class you would need to specify the exact class designation (e.g., the 1857 class might be designated "Class of 1857" or something similar). Then you'd need to consult the West Point archives or historical records to find the precise number.