Period Panty Size Chart

Get the Perfect Fit with Our Size Chart 

Finding the right fit for your period panty is essential for comfort and leak protection. Our period panty size chart is here to help you get it right the first time. At Plan B, we are all about giving you the confidence to live your life, no matter the time of the month.

How to Measure for Period Panties

• To find your perfect Plan B fit, simply measure your child’s hips at the widest point and compare your measurement to our period panty size chart. 
• Use these measurements with the size chart for period panty to find the perfect fit for ages 10–18.

A good fit ensures the leakproof layer does its job properly, keeping you feeling secure all day.

Tips for the Perfect Fit

• If your child is between sizes, choose the larger size to allow for growth spurts, which are common during the tween years.
• Consider the fit and comfort: Period panties should feel just like regular underwear, offering comfort throughout the day.
• Look for leakproof protection: Choose period panties that offer reliable protection, ideally for 6-8 hours, with an extended inner lining to keep messes at bay. They should be good for the skin, too.
• Always refer to the size chart to ensure the best fit based on waist measurements, keeping leaks and discomfort to a minimum.

Looking for other Plan B size guides? Check out our girls underwear size chart, girls bloomers size chart, and training bra size chart. Explore our full collection of comfortable and reliable period panty styles.