Glove Size Calculator (hand circumference)

Understanding the glove size calculator — concept and principle

Glove sizes are based on hand circumference. This calculator turns your hand measurement in centimetres into a numeric glove size, a letter size (XS to XXL) and the whole-number size used in the European standard for protective gloves. It helps when buying work, medical, sports or fashion gloves online, where you cannot try them on.

How it is calculated

• Measure the circumference of your dominant hand around the knuckles (the widest part of the palm), excluding the thumb.
• Numeric size: circumference in inches = cm ÷ 2.54, rounded to the nearest half size.
• Letter size: up to 6.5 = XS, 7 to 7.5 = S, 8 to 8.5 = M, 9 to 9.5 = L, 10 to 10.5 = XL, above that XXL.
• EN 420 size: circumference in inches rounded to the nearest whole number.

The principle

Glove sizing grew from the tradition of naming a glove by the hand's girth in inches. The European standard for protective gloves (EN 420, now EN ISO 21420) keeps that idea: size 6 corresponds to a hand circumference of about 152 mm, 7 to 178 mm, 8 to 203 mm, 9 to 229 mm, 10 to 254 mm and 11 to 279 mm, a step of one inch per size. The standard also lists a minimum hand length for each size, because a glove has to fit finger length as well as width. Letter sizes are a looser retail grouping of the same numbers and are not standardised.

Worked example

1. Input: hand circumference 21 cm.
2. Convert to inches: 21 ÷ 2.54 = 8.27 in.
3. Nearest half size: 8.27 × 2 = 16.54, rounded to 17, divided by 2 = 8.5.
4. Letter size: 8.5 falls in the 8 to 8.5 band, so M.
5. EN 420 whole size: 8.27 rounded = 8.

How to read the result

Your measurement sits between sizes 8 and 8.5, so both may fit. Choose the smaller for dexterity work such as nitrile examination gloves or cycling gloves, and the larger for insulated winter gloves or when your fingers are long. Typical adult ranges are about 6 to 8 for women's hands and 8 to 10 for men's hands, but individual hands vary widely.

Common mistakes

• Measuring the wrist or including the thumb, which gives a size too large.
• Measuring the non-dominant hand, which is often slightly smaller.
• Assuming brand letter sizes are identical; one maker's M can be another's L.
• Ignoring finger length: long fingers may need the larger size.

Frequently asked questions

My hand is 21 cm; what size should I buy?

Size 8 or 8.5, usually letter M.

Do glove sizes for men and women differ?

The numbers mean the same circumference, but women's ranges often run smaller and may have narrower fingers.

How do I measure without a tape measure?

Wrap a strip of paper or string around the knuckles, mark it, then lay it on a ruler.

Sources: EN ISO 21420:2020, Protective gloves: General requirements and test methods (formerly EN 420)