convert from one range to another equivalent range

Remap c# float Unity3d

float extension 

 public static float Remap(this float value, float from1, float to1, float from2, float to2,bool isClamped= false)
    {
        if(isClamped)
        {
            value = Mathf.Clamp(value,from1,to1);
        }
        return (value - from1) / (to1 - from1) * (to2 - from2) + from2;
    }