Period Panty Size Chart

Age	Waist (in)	Waist (cm)
10–12 y	25-26	64-66
12–14 y	26-27	66-69
14–16 y	27-28	69-71
16–18 y	28-30	71-76

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.

Period Panty FAQs

Is the period panty size chart the same as the size chart for regular underwear?

Mostly yes. You may use the same waist measurement. If the style has extra padding, you may prefer the next size up for a comfortable, easy pull-on fit.

Should period panties fit snug or relaxed?

Snug fit is best. It is similar to everyday underwear, so the leakproof layers sit flat and secure without digging in. The child must be able to wear it for overnight use, as it prevents leaks during heavy bleeding days.

How does a period panty work compared to pads or liners?

Period panties contain absorbent and waterproof layers built into the fabric, offering protection like a pad but without shifting. They can be worn alone on light days or as backup with other products. They are comfortable enough for beginners to use them with ease.

Can’t see your query listed? Reach out to us at hello@yougotplanb.com