A #10 envelope is 4-1/8″ x 9-1/2″. It is the most common business envelope size and is commonly used for standard 8-1/2″ x 11″ sheets of paper.
A #10 envelope is 4-1/8″ x 9-1/2″. It is the most common business envelope size and is commonly used for standard 8-1/2″ x 11″ sheets of paper.