Welcome to the best bra size calculator online. This website calculates bra fittings based on measurements in inches. If you have visited this website, it means that you are very serious about your bra size. There are three steps to measure bra size, here we will give information in detail. Do you know that about 60 to 80 percent of people wear a bra without measuring them? Wearing a well-fitted bra is not only good looking but it is also good for the body. How do I calculate my bra size? To understand how to calculate your bra size please follow these steps Step 1: Measure Your Band Size Step 2: Measure Your Bust Size Step 3: Calculate Your Bra size Now put that numbers here and calculate.