Mathf.InverseLerp

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public static function InverseLerp(a: float, b: float, value: float): float;

public static float InverseLerp(float a, float b, float value);

Description

Calculates the linear parameter t that produces the interpolant value within the range [a, b].

var walkSpeed = 5.0;
var runSpeed = 10.0;
var speed = 8.0;

function Start() {
    // parameter is now 3 / 5
    var parameter : float = Mathf.InverseLerp(walkSpeed, runSpeed, speed);
}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public float walkSpeed = 5.0F;
    public float runSpeed = 10.0F;
    public float speed = 8.0F;
    void Start() {
        float parameter = Mathf.InverseLerp(walkSpeed, runSpeed, speed);
    }
}

See Also: Lerp.