The best replacement for circumference is diameter.

The best alternatives to circumference are rated as following:
★★★★★  diameter
★★★★  radius
★★  perimeter
★★  area
★  bmi
★  diameter graph
★  girth
★  waist to hip ratio
★  circle
★  area of a circle
★  width
  diameter of a circle
  chest circumference
  body mass index
  ring size
  arc length
  waist circumference
  circle formula

Your alternative for circumference is not listed? Suggest!
Speaking about circumference, one probably shouldn't forget about diameter.

Other search terms related to circumference and their ratings are:
★★★★★ diameter
★★★★ radius
★★ radius formula
★ arc length
★ area
★ radius and diameter
only diameter
radius given
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circumference
diameter
radius