Belt Size Calculator

How it is calculated

The tool takes your waist (or trouser size) in inches and adds 2 inches for the belt wrapping over the waistband: belt = waist + 2. It then rounds that to a whole inch, with a half rounding up, because belts are sold in whole sizes. The centimetre figure is calculated from the rounded belt size, belt × 2.54, so the inch and centimetre results always agree. The waist is echoed back (33.5 shows as 33.50 in). Only waists from 15 to 120 inches give a result; anything outside that, such as 14 or 121, shows nothing. The field is in inches only, so a measurement in centimetres must be divided by 2.54 first. Brands and men's and women's sizing differ, so use the result as a starting point and check the brand's chart.

Common mistakes

• Entering a waist in centimetres. The field is inches, so 86 cm typed as is gives an 88 in belt; convert to about 34 in first.
• Entering the belt size you already own as the waist. The tool adds 2 inches, so a 36 in belt entered as the waist would suggest a 38 in belt.
• Measuring over thick clothing, or at the natural waist when you wear trousers on the hips. Measure where the belt will actually sit.
• Expecting the size to follow the exact decimal. The result is a whole inch, so 33.4 in gives 35 in while 33.5 in gives 36 in.
• Typing a waist below 15 or above 120 inches. Those inputs show no result, which usually means the wrong unit was used.