I see that i wasn't exactly clear.  I meat from kilometers per hour to miles per hour.  Every other number in the equation shifts to become feet, but the Dbrake stays the same.  For example, if I set the calculator to read 72 kilometers per hour, the Dbrake reads 20 meters, but if I change 72 kilometers to 45 miles per hour, the Dbrake reads 20 feet.  That number should go up because feet are smaller than meters.