Poodle sizes are determined by their height, measured from the highest point at the shoulders, down to the floor.
A poodle is considered a Standard Poodle when it is taller than 15”. The average size for a Standard is about 21”-23” for females and 25”-26” for males. But the Standard size of your poodle can vary depending on your breeder’s preference.
For example, my personal preference is to have a very “standard” Standard size poodle. I like a good, middle of the line, size because it’s a great size for the activities I enjoy with my poodles. Hiking and other outdoor activities require a good amount of stamina and ease of movement. In my mind, the 21”-25” Standard Poodle can move through tighter spaces and keep up with a full day of aggressive adventuring.