All my belts are individually personalized and made to measure, so it is important that you supply the correct measurements for a perfect fit and length of your choice.
1) Belt Size
Measuring an existing belt. Which is the most accurate method.
Also if you wish to choose how far it will overlap, you may add a second measurement which is from point A to the end tip of the strap, - otherwise my standard sizing is 7 inches (appx 18cm) from point B to the end tip.
2) Waist size
Measuring your waist with a tape measurement.
3) Trousers' Size
If neither of these methods are possible. For example if you are buying for someone else. Then try and find out the waist size of Jeans they normally buy, and I will be able to transpose it to the correct belt size.