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Flange Size Calculator — Free Online Tool
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Flange Size Calculator

Determine your correct breast pump flange or insert size in millimeters

Sizing Guidelines: Measure the diameter of your nipple base (excluding the areola) in millimeters (mm) right after a pumping session. Standard sizing guidelines generally add 2 to 4 mm to the measured diameter for comfort and optimal milk expression. Enter your measurement below.
Nipple Measurement Input

Calculation Results

⚠️ Not medical advice. For postpartum lactation education and breastfeeding reference only. If you experience nipple pain, friction, or poor milk output, consult an IBCLC (International Board Certified Lactation Consultant).

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