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Most fabrics come in 45 inches (110cm) or 60 inches (150cm) widths. You may need to check the fabric you want to use to see what the width is before you calculate this measurement. Check with a store associate if you are unsure. If you are planning to use some scrap fabric for the binding, then measure across the shortest part of the fabric piece to find the width. Use the perimeter measurement plus the 10 inches (25cm) you added and divide this number by the total width of your binding fabric. For example, if the perimeter plus 10 inches (25cm) equals 190 inches (480cm) and the fabric width is 60 inches (150cm), then your result would be 3.2. This will tell you how many strips you need to cut from the fabric to get the required amount. However, you will need to round up your result if you do not get a whole number. For example, if your answer is 3.2, then round up to 4.
Identify the fabric width. Divide the perimeter plus 10 inches (25cm) by the fabric width. Round up the result.