Maximum size for Invitations w/out extra postage cost
Hi all, I was wondering if anyone knew the specific measurements for the Post Office? I am thinking about ordering either invitations either 5 1/2 x 5 1/2" or 5 1/2 x 7 1/2" but am not sure if extra postage will be required. If so, does anyone know how much extra?

Married: 07/10/2010
Reviews: 5
Posted On: Apr 16, 2010 at 1:47 AM • Vendors are allowed • Add to My WatchlistFlag As Inappropriate1 like

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Married: 08/21/2010
Apr 16, 2010 at 2:00 AM • Flag As Inappropriate
It also goes by the weight. Go to the Post office and ask them to slide it through their "fake slot" if it fits it will ship, then you just have to worry about the weight:)

Married: 08/21/2010
Apr 16, 2010 at 2:01 AM • Flag As Inappropriate
Oh my envel;ope fit & it was 5 1/4 by 7 1/2.

Married: 08/21/2010
Apr 16, 2010 at 2:02 AM • Flag As Inappropriate
And my envelope fit through their fake slot it was 5 1/4 by 7 1/2. It barely made it :)

Married: 08/21/2010
Apr 16, 2010 at 2:05 AM • Flag As Inappropriate
haha sorry it didnt post the first time..and now all of a sudden it appears lol!

Married: 08/13/2011
Apr 16, 2010 at 2:07 AM • Flag As Inappropriate
I hope this helps? I second what Ana said they go by weight.

Married: 10/10/2010
Reviews: 9
Apr 16, 2010 at 2:58 AM • Flag As Inappropriate
5 1/2 X 7 1/2 is a good size. Up to 1 oz is 44 cents, 2 oz is 61 cents and 3 oz is 78 cents. My save the dates were 5 1/2 X 7 1/2, they were 2 layers and I included a small envelope with 4 business cards in them. They were just under 1 oz. so postage was only 44 cents.


Melissa D Weddings
Apr 16, 2010 at 7:31 AM • Flag As Inappropriate
Square envelopes are extra, no matter what the size. They charge an extra $0.20 for square, since it's considered non-machinable.
Apr 16, 2010 at 1:03 PM • Flag As Inappropriate
A 5.5x7.5 envelope will not require extra postage because of the size.

Depending on how many inserts you have though, it might need extra postage to cover the weight.

ALSO, if the envelope is especially thick (post office can measure for you) it will also require extra postage.

Square invitations will automatically require extra postage as well.

Married: 2+ years ago
Apr 16, 2010 at 1:22 PM • Flag As Inappropriate
Be careful with your RSVP cards, my RSVP cards and envelopes were 3 1/2 x 4 1/4 and because of their smaller size they ended up costing more than the invite.

Married: 10/10/2010
Reviews: 9
Apr 16, 2010 at 1:28 PM • Flag As Inappropriate
Yeah anything too small, too big or too heavy wont go through the machines. Having the machines do most of the work has kept regular postage lower. Gotta pay someone to do the work if the machine cant. Im expecting my 5X7 invites to cost at least 61 cents. But Im doing post card RSVPs to offset the cost.
Apr 26, 2010 at 11:10 AM • Flag As Inappropriate
USPS regulation for First Class Mailing:
at least 3-1/2 x 5 and .007 thick but no more than
6-1/8 x 11-1/2 and .25 thick

check here for more info:

Married: 12/08/2010
Dec 06, 2010 at 5:21 AM • 
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Married: 05/17/2014
Reviews: 1
Mar 16, 2014 at 10:50 PM • Flag As Inappropriate
Does anyone know how much the postal cost will be for a 5X7 invite and an enclosure card with 220 lb paper each? I know I can go to the post office but if anyone knows, it'll help :) Thanks in advance.
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