Underwear size chart : How do I know my underwear size?

The best way to know your underwear size is to measure your waistline. A flexible tape measure is all you require! To show off your natural waistline crease, bend your body to the sides. Where you usually wear your pants, wrap the measuring tape around your waist. This measurement in inches will determine your underwear size. The Underwear Size Chart is the start for men and women looking for comfortably fitting underwear.

Underwear size chart: How do i know my underwear size and how it fits?

Jump immediately to the frequently asked questions about underwear size on this page

How can I be sure my underwear fits me?

Underwear shouldn’t generally be overly tight or loose. The ideal fit falls in the middle and is neither loose nor tight on your body. While wearing your underwear under clothing, you should be able to move around freely and comfortably. A set of underwear allows for comfort and mobility while providing the coverage and support you need.

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How do I know my underwear is too small?

Your underwear is too small and must be changed when:

  • you feel constrained by them.
  • If removing your underwear leaves marks on your skin
  • if it’s causing the skin on your hips to sag.
  • If you see clear marks through your clothing

What does size of Underwear mean exactly ?

Size of Underwear is usually described as the measurements of items of clothing worn beneath outer clothes, mostly in direct contact with the skin, meaning it’s a term that groups Bras, Pants (or panties/knickers) worn by women today, while men wear tees, tanktops, singlets, briefs, trunks, boxer shorts or boxer briefs. As underwear should feel comfortable, an underwear size chart will help you find the correct size for the type of underwear you want.

Typical synonyms for underwear are undies, undergarments, where women’s underwear often is referred to as Lingerie or Intimates.

Underwear Size chart for Women’s Pants

The underwear size guide below shows the hip measurement conversion into pant size. The hip measurement is shown in inches and centimeters.

Underwear SizeHips Pant Size
XS (Extra Small)
34 – 35″
86 – 89 cm
2 – 4
S (Small)
36 – 37″4 – 6
M (Medium)
38 – 39″8 – 10
L (Large)
40 – 41″12 – 14
XL (Extra Large)
42 – 43″14 – 16
2XL or XXL
44 – 45″16 – 18
46 – 47″18 – 20

What size underwear for size 16 pants?

A size 16 pants would require XL to XXL large underwear

Women’s Panties Underwear plus Size Chart

The below handy underwear size chart converts plus sizes into a plus size dress

945 – 46.514W/16W
1047 – 48.518W/20W
1149 – 51.522W/24W
1252 – 55.526W/28W
1356 – 59.530W – 32W
1460 – 63.534W – 36W

Underwear sizing : how to avoid wearing wrong size underwear (video)

I Was Wearing THE WRONG Underwear My WHOLE LIFE | Are You Making the Same MISTAKES? by Angela Masson – Fashion Over 50

Bra size

The two major aspects of bra size are the band size and the cup size. Find below a summary which gives you an idea about how the sizing of bras work, but we advise to check out the dedicated Bra Size Charts here

Band size (frame size)

The band size is the size of the bra band around the torso. However, band sizes come in different measurements in different countries, such as small, medium, and large, equate to different measurements. Refer to the table below for some size measurements, though some variation from the published measurements is possible.

Band SizeFR/BE/ESEU (Standard EN 13402)US and UKAU, NZ

Cup size

The cup size can be calculated using the difference between bust and band sizes. Refer to the table below.

Bust/band difference in inchesUS cup sizeUK/AU cup size
5E or DDDD
6F or DDDE
Bust/band difference in cmContinental Europe cup size

Related Underwear size guide articles

Related: Kids Socks Size Chart by age: What are sock sizes for boys & girls , Sock Size Chart – The full sock fitting guide for men, women and kids

Underwear Size chart extra: Bikini Size Chart

As swimwear or summer wear is not 100% the same as underwear, the size charts are added here, but you can dig deeper into the bikini size charts here. It might be you need to choose a larger size than your regular underwear size.

Bikini Top

Sizing of bikini tops generally follows the same system observed in bra sizes. Size labels combine numbers and letters corresponding to a particular cup size and underbust measurement. For example, you’re probably familiar with bra sizes like 32B and 36C.

Related: Bikini size Chart And Sizing Guide

Bikini Bottom

On the other hand, Bikini bottom sizes are typically labeled the same as standard or classic clothing sizes. Sizes are usually numerical and are based on measuring waist and/or hip circumferences. For example, a size 4 or 6 is usually for petite women, while sizes 18 and 20 are for those with a curvier size waist. However, there are swimwear brands that use the best-known international sizing system (e.g., Small, Medium, Large, etc.) to classify their bikini bottom sizes

How to convert men’s underwear sizes to women’s sizes?

There’s no real rule to convert the correct size between female and male underwear. Start with your natural waist measurement and some common sense. The below table converts men’s underwear sizes to women’s sizes, including waist sizes in both inches and centimeters:

Men’s Underwear sizeWomen’s Underwear SizeWaist Size InchesWaist Size Cm

Note that these male to female underwear size conversions are approximate and may vary depending on the brand and style of underwear.

Underwear Sizing chart for Men’s Pants

Men’s Underwear sizing is a bit more easy. Find the correct waist size and convert it into alfa sizes. It’s built on standard adult sizes and normal size hips.

SizeWaist (inches)
S28 – 30
M32 – 34
L36 – 38
XL40 – 42
2XL44 – 46
3XL48 – 50

Kid’s underwear size guide for boys and girls

Boys and girls’ underwear size table with columns for alpha sizes, waist sizes in centimeters and inches, age indications, starting from baby size to teens size:

Alpha SizeWaist Size (cm)Waist Size (inches)Age Indication
0-3Mup to 44 cmup to 17.3 inches0-3 months
3-6M44-46 cm17.3-18.1 inches3-6 months
6-9M46-48 cm18.1-18.9 inches6-9 months
9-12M48-50 cm18.9-19.7 inches9-12 months
12-18M50-52 cm19.7-20.5 inches12-18 months
18-24M52-54 cm20.5-21.3 inches18-24 months
2T52-54 cm20.5-21.3 inches2 years
3T54-56 cm21.3-22 inches3 years
4T56-58 cm22-22.8 inches4 years
XS50-55 cm19.7-21.7 inches4-5 years
S55-60 cm21.7-23.6 inches6-7 years
M60-65 cm23.6-25.6 inches8-9 years
L65-70 cm25.6-27.6 inches10-11 years
XL70-75 cm27.6-29.5 inches12-13 years
XXL75-80 cm29.5-31.5 inches14+ years

Note: These are general guidelines, and it’s essential to consider the individual child’s measurements and preferences when choosing underwear size.

Related: Baby Romper Size Guide , My Daughters’ first bra

How to measure my Underwear size?

Waist Measurement

Measure around your waist, slightly below your natural waist, where you normally wear your pants. Insert your forefinger between the tape and your body to allow ease in fit.

Tip: For the most accurate results, measure yourself in your undergarments.

In between Sizes?

Pick the next larger size in the chart if your measurements are between standard adult sizes.

Frequently Asked Questions (FAQ)

Boxer briefs for women's size
What size Boxer briefs should I wear as a woman?

What size boxer briefs should i wear as a woman?

The size of boxer briefs for women depends on the natural waistline measurement. There’s no real rule of thumb to convert male brief sizes into women’s. Briefs, boxers, and boxer briefs for men often come in standard sizes based on a man’s waistline (small, medium, large, etc.). For instance, waist sizes between 28 and 30 inches are typically categorized as small and would be a Medium for women’s Briefs , 32 to 34 inches as medium, resulting in a Large size brief for women.

Should I size up or down in Boxer briefs sizing?

While looking for new underwear, if your underwear size is in the middle of two sizes on a size chart, wear boxer briefs that are the bigger size. This advice stands for women’s, men’s and unisex sizing


What size underwear is a 32 waist?

A 32 waist measurement (or hips size) equals medium size for men or large size for women’s underwear. (panties, boxers, briefs)

What size underwear is XL?

Extra-Large (XL) sized underwear for men equals 40 – 42 inch waist (101 – 106 cm) , for women this is for a 36 – 38 inch waist size (91 – 96 cm)

What is the underwear size for 85-90?

An 85 – 90 cm waist size corresponds with a Medium to Large underwear size for men. Women with 85 – 90 hips size should look for Large to XL sized underwear




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