Flange Size Calculator
Find the perfect breast pump flange size for comfortable pumping
Calculate Your Flange Size
Measure at the base of the nipple (widest part)
Size Category: Average
20.0mmStandard size, most flanges will have good options
Common considerations:
- Standard sizing should work well
- Good selection available
Your Flange Size Recommendations
Optimal fit for comfort and efficiency
Important Notice
This calculator provides general sizing guidance. Individual fit may vary based on personal anatomy, pump brand, and pumping conditions. If you experience pain, discomfort, or ineffective pumping, consult with a lactation consultant for personalized fitting assistance.
Common Flange Sizes
Signs of Wrong Size
Too Small:
- • Nipple compression or pain
- • Red or white nipple after pumping
- • Nipple stuck in tunnel
- • Reduced milk output
Too Large:
- • Areola being pulled in
- • Poor suction or seal
- • Nipple moves too freely
- • Inefficient milk removal
Perfect Fit Tips
Nipple moves freely in tunnel
Little to no areola in flange
Comfortable throughout pumping
Efficient milk removal
No pain or discomfort
Complete Flange Sizing Guide
| Nipple Diameter | Recommended Flange | Size Category | Common Brands |
|---|---|---|---|
| 15mm | 19mm | Small | Spectra, Motif |
| 17mm | 21mm | Small | Medela, Spectra |
| 20mm | 24mm | Average | Most brands |
| 23mm | 27mm | Average | Most brands |
| 24mm | 28mm | Large | Medela, Spectra |
| 27mm | 30mm | Large | Spectra, Motif |
| 28mm | 32mm | Large | Spectra, Motif |
| 32mm | 36mm | X-Large | Spectra, Motif |
| 36mm | 40mm | X-Large | Spectra, Custom |
Understanding Breast Pump Flanges
What is a Flange?
A breast pump flange (also called a breast shield) is the funnel-shaped plastic piece that fits over your nipple and areola during pumping. It creates a vacuum seal that allows the pump to extract milk efficiently.
Key Functions:
- • Creates vacuum seal for milk extraction
- • Protects nipple during pumping
- • Channels milk to collection bottle
- • Ensures comfortable pumping experience
Why Size Matters
Using the correct flange size is crucial for effective pumping and your comfort. The wrong size can cause pain, reduce milk output, and lead to complications.
Benefits of Proper Fit:
- • Maximizes milk output
- • Prevents nipple damage
- • Reduces pumping time
- • Improves overall comfort
- • Helps maintain milk supply
Professional Fitting
When to Seek Help
- • Persistent pain while pumping
- • Decreasing milk supply
- • Nipple damage or discoloration
- • Ineffective milk removal
Who Can Help
- • International Board Certified Lactation Consultant (IBCLC)
- • Hospital lactation staff
- • Breastfeeding support groups
- • Pump manufacturer representatives