Find the right belt size from your waist measurement or pant size. Shows the recommended belt length in inches and cm, retail size and comfort range.
Belt sizes are approximate and vary by brand and buckle style — measure your waist over the clothes you'll wear.
About this tool
This calculator recommends a belt size from either your natural waist measurement or your pant/trouser size, running entirely in your browser with nothing uploaded. Choose which you are entering, type the number, and pick inches or centimeters.
The rule of thumb is to buy a belt about two inches larger than your waist, so it fastens comfortably on the middle hole. The tool adds 2 inches to your waist (a pant size is treated as the waist in inches) to get the recommended belt length, converts it to centimeters, rounds to the nearest even number for the size printed on the belt, and gives a comfort range of roughly one hole (±1 inch) on either side.
Belt length is measured from the buckle fold to the middle hole, not the total strap length, so the retail size shown is the number to look for on the label. If you wear your belt over bulky layers or plan to add holes, lean toward the larger end of the comfort range.
Frequently asked questions
Why buy a belt bigger than my waist?
Belt sizes refer to the length to the middle hole, and the belt sits over trousers and any tucked shirt. Adding about two inches to your waist lands you on the center hole with room to adjust.
Can I use my jeans or trouser size?
Yes. Switch the mode to pant size and enter that number — it is treated as your waist in inches, so the tool still adds 2 inches for the recommended belt size.
What is the comfort range?
Belt holes are usually spaced about an inch apart. The range shows one hole tighter and one looser than the recommended size, so you can see how much adjustment you'll have.
Are belt sizes the same across brands?
No, they are approximate and vary by brand and buckle style. Use the retail size as a starting point and check the brand's chart, especially for full-grain leather that stretches over time.