Leather is a natural product and as a result each skin is slightly different. If you need several skins for a project, make sure to choose skins with uniform color, texture, thickness and grain.
Leather is sold by the square foot. To convert fabric yardage to leather square footage, multiply the 45" fabric allowance by 11.25. Always add 10% extra to the total to allow for marks, holes and blemishes. For instance, if your pattern calls for 1.25 yards of 45" fabric, multiply 1.25 by 11.25, and then add 10%.
1.25 (yards) x 11.25 = 16.875 (sq ft) x 1.1 (10% extra) = 18.5 square feet