AnimationClip.frameRate

Description

Frame rate at which keyframes are sampled. (Read Only)

This is the frame rate that was used in the animation program you used to create the animation or model.

using UnityEngine;
using System.Collections;

public class ExampleScript : MonoBehaviour
{
    public Animation anim;

    void Update()
    {
        // Prints the frame rate of the animation clip to the console
        print(anim["walk"].clip.frameRate);
    }
}