Postage for a 1 oz Invitation
An invitation weighing 1 oz or less needs $0.82, which is one Forever stamp, as long as the envelope is a flexible rectangle with nothing lumpy on it.
Your answer
Standard letter
No extra postageRegular letter postage. No surcharge.
- Postage per piece
- $0.82
- 100 invitations
- $82.00
Stamps for each one
1 × Forever (1 oz letter)
Why
- This is a standard letter: within 6.125 x 11.5 in, no thicker than 0.25 in, and length divided by height is 1.38 (it must be between 1.3 and 2.5). USPS rule
Rates last verified on
100 invitations: $82.00 in postage ($0.82 each, standard letter)
What fits in one ounce
One ounce is 28.35 grams. It is not much paper. A single invitation card in its envelope is typically inside it. A card plus a small reply card and reply envelope is often right at the line, and the result depends on the stock.
This is the weight where a kitchen scale earns its keep. If the scale reads 1.0 oz, weigh three or four finished pieces: any one of them at 1.1 oz means the whole batch should be stamped for 2 oz.
When 1 oz costs more than one stamp
Weight is only half the price. A 1 oz invitation pays $1.31 instead of $0.82 if it is nonmachinable, which means any of these:
- a square envelope
- a wax seal or anything else that makes a lump
- ribbon or twine on the outside
- a rigid card that does not bend
- the address written along the short side
Cheaper than one stamp
A bare card with no envelope, between 3 1/2 x 5 in and 4 1/4 x 6 in, mails at the postcard price of $0.65. That suits save-the-dates and reply cards. A 5 x 7 card is too big for it and pays the letter price even without an envelope.
For a whole guest list
At $0.82 each, 100 invitations cost $82.00 and 150 cost $123.00. Forever stamps bought today stay valid for 1 oz letters after any future price change, so buying early carries no risk.
A quick 1 oz checklist
You are at one Forever stamp if all of these are true: the finished piece is 1 oz or less, the envelope is a rectangle, it bends easily, it feels smooth and flat, and the address runs along the long side.
Compare the options
| Option | Mail class | Each | For 100 |
|---|---|---|---|
| A7 rectangle, 1 oz | Standard letter | $0.82 | $82.00 |
| A7 with a wax seal, 1 oz | Nonmachinable letter | $1.31 | $131.00 |
| 5.5 in square, 1 oz | Nonmachinable letter | $1.31 | $131.00 |
| Bare 4 x 6 postcard | Postcard | $0.65 | $65.00 |
| A7 at 1.1 oz | Standard letter | $1.11 | $111.00 |
Questions and answers
How many stamps for a 1 oz invitation?
One Forever stamp, worth $0.82, for a standard rectangular envelope.
How much is a 1 oz square invitation?
$1.31: the $0.82 letter price plus the $0.49 nonmachinable surcharge.
What if my invitation is slightly over 1 oz?
It pays the 2 oz price of $1.11. Any fraction over an ounce counts as a full extra ounce.
Do Forever stamps expire?
No. A Forever stamp is always worth the current 1 oz letter price, whenever it was bought.