Flange Size Calculator

Calculate correct breast pump flange size. Determine optimal flange size based on nipple measurements for comfortable and effective pumping.

Nipple Measurement

Measure nipple base diameter (not areola) in millimeters

Results

Enter nipple diameter to calculate flange size

About Flange Size

  • • Flange size = Nipple diameter + 2-4 mm
  • • Common sizes: 21mm, 24mm, 27mm, 30mm
  • • Too small: Pain, friction, reduced output
  • • Too large: Reduced suction, areola pulled in