A7 - (5 1/4 x 7 1/4) - Also known as a 5x7 envelope. Used for many standard cards and invitations. A8 - (5 1/2 x 8 1/8) - Used as an outer envelope.

Likewise, what size is a number 7 envelope?

COMMON ENVELOPE NAME STANDARD SIZE MAXIMUM ENCLOSURE SIZE 6 envelope 5-3/4 x 8-7/8 inches 5-1/2 x 8-5/8 inches 6-1/2 envelope 6 x 9 inches 5-3/4 x 8-3/4 inches 6-5/8 envelope 6 x 9-1/2 inches 5-3/4 x 9-1/4 inches 9 envelope 8-3/4 x 11-1/2 inches 8-1/2 x 11-1/4 inches
Similarly one may ask, what is the actual size of a 5x7 envelope?

A7 Envelopes are commonly called 5x7 Envelopes because they are the best envelope for 5 x 7 cards. This size invitation envelope also fits smaller A Sizes inside (A1, A2, A4, A6) as part of an invitation suite. Sealed by the moistenable glue strip on the back flap.

What is a normal envelope size?

Regular Envelopes are the standard of business envelopes. This product range includes the popular #10 envelope which measures 4 1/8 by 9 1/2. All regular envelopes feature a solid front with no window, and a basic flap on the back.