Ghost Mannequin

SIZE GUIDES / Underwear

Men’s Underwear Size Chart — Briefs, Trunks & Boxers

Compare XXXS–XXXL underwear with waist ranges, and use your waist measurement to find a reference size.

Updated: · No sign-up required

Find a country or size system

Choose a country to jump to its size chart. Use the chart for the brand you plan to buy; unavailable systems cannot be converted here.

US · unavailableUK · unavailableEurope · unavailableRussia · unavailableJapan · unavailableKorea · unavailableS-M-L

ASOS provides letter sizes and waist bands here, not separate Russian, Japanese or Korean labels. For an Asian-market brand, compare its stated waist range; do not assume its M equals ASOS M.

Underwear waist ranges

Don’t know your size? Use measurements

Enter your body measurements. If several ranges overlap, the first match is shown; between two listed measurements, the larger size is shown. Check the product’s fit before buying. ASOS · own-brand reference

Choose a size to highlight matches, or select a row below.

Scroll sideways for the full chart

Underwear waist ranges — ASOS · own-brand reference
ASOS sizeWaist range (in)Waist (cm)
24–2661–66
26–2866–71
28–3071–76
30–3276–81
32–3481–86
34–3686–91
36–3891–96
38–4096–101
40–42101–106

For ASOS own-brand clothing. Check the product’s cut and choose centimetres or inches to compare your measurements.

Brand size guide: ASOS · own-brand reference

Read an underwear waist range before choosing a letter

A letter represents a waist band in this ASOS reference. An 83 cm waist falls within M, while the shared 81 cm boundary appears in both S and M ranges. The finder uses the first containing band, so compare adjacent cuts when you are on a boundary. Its result is a starting reference, not an estimate of waistband tension.

Briefs, trunks and boxers can share a waist label while providing different leg coverage and pouch space. Use your natural waist measurement and check where the specific waistband sits. If the waistband is comfortable but the leg opening digs in, simply repeating the country conversion will not resolve the cut difference.

See how a size converts

In Underwear waist ranges choose ASOS size M. The listed equivalents are:

  • ASOS size M
  • Waist range (in) 32–34

Brand size guide: ASOS · own-brand reference

Open this example in the converter →

Three checks before ordering

  1. Match the product brand, country system and garment type to the selected table.
  2. Keep body and garment measurements separate, with consistent centimetre or inch units.
  3. Check the specific style’s length, width and stretch, then read the store’s sizing and exchange information.

START WITH MEASUREMENTS

How to measure

Chest / bustNatural waistFullest hipsHeight
Measure circumferences all the way around the body, not across the front. Measure height barefoot. Diagram not to scale.
  1. 01

    Stand naturally and measure around your waist with a level tape.

  2. 02

    Keep the tape close without pulling it tight; record the measurement unit.

  3. 03

    Compare the measurement with the product’s waist position and fabric stretch.

A few things labels don’t tell you.

Elastic waistbands and leg openings affect comfort. A waist match alone cannot predict the fit of the pouch or thighs.

Common questions

What waist does ASOS M underwear fit?

This reference lists 81–86 cm. Boundary values can appear in adjacent bands; compare the product cut.

Can I use my jeans size?

Measure your waist first. Jeans labels and underwear letter sizes are different systems.

Can I convert men’s underwear to Russia, Japan, Korea or S-M-L?

ASOS provides letter sizes and waist bands here, not separate Russian, Japanese or Korean labels. For an Asian-market brand, compare its stated waist range; do not assume its M equals ASOS M.