You are asking for an input in inches, and treating it as if it was in feet...
Try this:
d_inches = int(input("Enter Inches to convert: "))
d_ft = d_inches / 12.0
d_miles = d_ft / 5280.0
d_yards = d_ft / 3.0
print("The distance in inches is %i inches." % d_inches)
print("The distance in feet is %.1f feet." % d_ft)
print("The distance in yards is %.2f yards." % d_yards)
print("The distance in miles is %.6f miles." % d_miles)