Breast Pump Flange Size Calculator
Calculate your ideal breast shield size and silicone insert recommendation based on base nipple diameter measurements.
mm
Recommended Flange Fit
19 – 21 mm Shield
Add 1 to 2 mm to your base measurement for optimal tunnel clearance without areolar friction. If using standard 24mm cups, use a 19mm silicone insert.
Measurement Tip: Measure your nipple diameter across the base immediately prior to pumping (exclude the areola). For in-depth guidance, read our Complete Flange Sizing Guide.