ENVELOPE SIZE CHART A common question we always get asked. What is the envelop size and what number is it? The following is a chart for all of the sizes and applications. Business & Correspondence Widely used for business and personal correspondence. Commercial and Side Seam flap styles are ideal for machine insertion. Wallet flaps provide a large area ideal for imprinting. Square flaps are contemporary, but not recommended for machine insertion. TYPE SIZE ENCLOSURE 6 1/4 3.5″ x 6″ 3.25″ x 5.75″ 6 3/4 3.625″ x 6.5″ 3.5″ x 6.25″ 8 5/8 3.625″ x 8.625″ 3.5″ x 8.375″ 7 3.75″ x 6.75″ 3.5″ x 6.5″ Monarch (7 3/4) 3.875″ x 7.5″ 3.75″ x 7.25″ 9 3.875″ x 8.875″ 3.75″ x 8.675″ 9 (policy) 4″ x 9″ 3.75″ x 8.5″ 10 4.125″ x 9.5″ 4″ x 9.25″ DL 4.313″ x 8.625″ 4.125″ x 8.375″ 11 4.5″ x 10.375″ 4.25″ x 10.125″ 12 4.75″ x 11″ 4.5″ x 10.75″ 14 5″ x 11.5″ 4.75″ x 11.25″ 16 6″ x 12″ 5.75″ x 11.75″ Booklet This style is ideal for annual reports, brochures, sales materials, and more. The open side makes it acceptable for automatic insertion. TYPE SIZE ENCLOSURE 3 4.75″ x 6.5″ 4.5″ x 6″ 4 1/2 5.5″ x 7.5″ 5.25″ x 7″ 5 5.5″ x 8.125″ 5.25″ x 7.625″ 6 5.75″ x 8.875″ 5.5″ x 8.375″ 6 1/2 6″ x 9″ 5.75″ x 9″ 6 5/8 6″ x 9.5″ 5.75″ x 9″ 6 3/4 6.5″ x 9.5″ 6.25″ x 9″ 7 1/4 7″ x 10″ 6.75″ x 9.5″ 7 1/2 7.5″ x 10.5″ 7.25″ x 10″ 9 8.75″ x 11.5″ 8.5″ x 11″ 9 1/2 9″ x 12″ 8.75″ x 11.5″ 10 9.5″ x 12.625″ 9.25″ x 12.125″ 13 10″ x 13″ 9.75″ x 12.5″ Catalog Center seam makes this style more durable for mailing heavy-weight materials. These envelopes can not be processed through inserting equiptment or run through a laser printer. TYPE SIZE ENCLOSURE 1 6″ x 9″ 5.75″ x 8.75″ 1 3/4 6.5″ x 9.5″ 6.25″ x 9.25″ 3 7″ x 10″ 6.75″ x 9.5″ 6 7.5″ x 10.5″ 7.25″ x 10″ 8 8.25″ x 11.25″ 8″ x 10.75″ 9 3/4 8.75″ x 11.25″ 8.5″ x 10.75″ 10 1/2 9″ x 12″ 8.75″ x 11.5″ 12 1/2 9.5″ x 12.5″ 9.25″ x 12″ 13 1/2 10″ x 13″ 9.75″ x 12.5″ 14 1/2 11.5″ x 14.5″ 11.25″ x 14″ 15 10″ x 15″ 9.75″ x 14.5″ 15 1/2 12″ x 15.5″ 11.75″ x 15″ Square This unusual shape attracts attention to contents. Square envelopes are nonstandard and require additional postage to mail. TYPE SIZE ENCLOSURE 5″ 5″ x 5″ 4.75″ x 4.75″ 5 ½” 5.5″ x 5.5″ 5.25″ x 5.25″ 6″ 6″ x 6″ 5.75″ x 5.75″ 6 ½” 6.5″ x 6.5″ 6.25″ x 6.25″ 7″ 7″ x 7″ 6.75″ x 6.75″ 7 ½” 7.5″ x 7.5″ 7.25″ x 7.25″ 8″ 8″ x 8″ 7.75″ x 7.75″ 8 ½” 8.5″ x 8.5″ 8.25″ x 8.25″ 9″ 9″ x 9″ 8.75″ x 8.75″ 9 ½” 9.5″ x 9.5″ 9.25″ x 9.25″ 10″ 10″ x 10″ 9.75″ x 9.75″ 13 ½” 13.5″ x 13.5″ 13.25″ x 13.25″ Baronial Deep pointed flap traditionally used for formal announcements and invitations. Not recommended for machine insertion. TYPE SIZE ENCLOSURE Professional* 2.125″ x 3.625″ 2″ x 3.5″ #16 (Mrs.)* 2.375″ x 3.375″ 2.25″ x 3.125″ #17 (Mr. & Mrs.)* 2.6875″ x 3.6875″ 2.5625″ x 3.5625″ Gladstone* 3.563″ x 5.562″ 3.375″ x 5.375″ 4-Bar 3.625″ x 5.125″ 3.475″ x 4.875″ 5½-Bar 4.375″ x 5.75″ 4.25″ x 5.5″ 6-Bar/Walton Outside 4.75″ x 6.5″ 4.625″ x 6.25″ Lee 5.25″ x 7.25″ 5.125″ x 7″ Linwood/Monona Inside 5.25″” x 7.5″” 5″ x 7.25″ Monona Outside 5.5″ x 7.75″ 5.25″ x 7.5″ * This size is too small to mail. Announcement Also called A-style, this contemporary design is idea for photographs, greeting cards, small booklets, and promotional pieces. Do not confuse the A-4 size with metric A4 paper, which fits into a DL size Commercial envelope. TYPE SIZE ENCLOSURE A-2 4.375″ x 5.75″ 4.25″ x 5.5″ A-6 4.75″ x 6.5″ 4.625″ x 6.25″ A-7 5.25″ x 7.25″ 5″ x 7″ A-8 5.5″ x 8.125″ 5.25″ x 7.75″ A-9 5.75″ x 8.875″ 5.5″ x 8.625″ A-10 6″ x 9.5″ 5.75″ x 9.25″