Yes — Forever Stamps are the most practical choice for wedding invitationsEach Forever Stamp currently costs $0.82 and covers the USPS First-Class Mail rate for a standard 1-ounce letter. Because they remain valid regardless of future price increases, every stamp you buy today will still cover your invitations, RSVP envelopes, and thank-you cards — no matter when you mail them.
Current USPS letter rates
As of September 13, 2026, USPS Notice 123 lists $0.82 for an eligible stamped domestic letter up to 1 ounce, $1.11 for 2 ounces, $1.40 for 3 ounces and $1.69 for 3.5 ounces. The additional-ounce increment is $0.29, and a qualifying nonmachinable letter adds $0.49. The schedule took effect July 12, 2026.
These prices apply only after the finished piece is classified correctly. Postcards, flats, packages, international mail and added services use different rules.
How Forever Stamps Work for Wedding Mail
The USPS Forever Stamp follows one straightforward rule: it is always worth the current First-Class Mail price for a 1-ounce letterUSPS rates effective July 12, 2026 should be treated as current, not as a future buying deadline.
For wedding invitations specifically, this means:
- Standard rectangular envelopes (up to 6⅛″ × 11½″, under ¼″ thick, 1 oz or less) require one Forever Stamp.
- Heavy cardstock, layered inserts, or wax seals may push your envelope over 1 oz, requiring an additional-ounce stamp (currently $0.29).
- Square envelopes are classified as non-machinable and carry a surcharge (currently $0.49 extra), regardless of weight.
- Oversized or rigid envelopes may be classified as flats rather than letters, which use a separate rate structure starting at $1.50.
Understanding these categories before you order stamps prevents the most common wedding postage mistake: assuming one Forever Stamp covers every envelope in your suite.
How Many Forever Stamps Does Your Wedding Need?
Wedding postage goes well beyond the invitation envelope. A complete mailing count includes every piece of outbound correspondence your guests receive. Many couples underestimate the total and end up making a last-minute stamp purchase — sometimes at a higher price if a rate change has taken effect in the meantime.
| Wedding Mailing | Typical Quantity | Stamps per Piece | Total Stamps |
|---|---|---|---|
| Save-the-Dates | 100 | 1 | 100 |
| Wedding Invitations (outer envelope) | 100 | 1* | 100 |
| RSVP Envelopes (pre-stamped for guests) | 100 | 1 | 100 |
| Thank-You Cards | 100 | 1 | 100 |
*Assumes standard rectangular envelope at 1 oz or less. Square or heavy envelopes require additional postage — see the next section.
Adjusting for Your Guest List
Not every wedding has exactly 100 invitations. Here is how to scale the count:
- Small wedding (50 guests): 200 stamps total — two rolls or four books of 20.
- Medium wedding (100 guests): 400 stamps total — four rolls or twenty books of 20.
- Large wedding (150 guests): 600 stamps total — six rolls or thirty books of 20.
- Extra buffer: Add 10–15% to account for addressing mistakes, last-minute additions, or stamp damage during assembly.
Rolls of 100 are usually the most convenient format for wedding mailings because you can peel and place stamps quickly during envelope assembly sessions. Books of 20 work well if you prefer to buy in stages as each mailing milestone approaches.
Choosing Wedding Stamp Designs
USPS releases several Forever Stamp designs each year, and wedding-appropriate options rotate seasonally. The right design depends on the formality of your event, the visual tone of your invitation suite, and personal preference.
Popular Wedding Stamp Categories
- Floral stamps — Roses, peonies, and garden flowers are the most traditional choice for formal weddings. They pair well with watercolor invitations, calligraphy envelopes, and neutral-toned cardstock.
- Love and heart designs — The USPS regularly issues Love-themed stamps around Valentine’s Day. These work across casual and formal suites and are available year-round once released.
- Calligraphy and typography stamps — Stamps featuring elegant script or lettering complement modern minimalist invitation designs.
- Seasonal and nature designs — Botanical prints, butterflies, or landscape scenes can match a spring, summer, or outdoor wedding theme.
- Classic and commemorative designs — If your invitation design is highly ornate, a simpler stamp design (such as a solid-color Love stamp) may look cleaner against the envelope.
The most practical approach is to choose a design that matches the overall tone of your wedding rather than trying to match the exact colors of your invitation. A rose-themed stamp on a cream envelope with dark green calligraphy, for example, looks cohesive even if the stamp and invitation colors are not identical.
USPS rates effective July 12, 2026 should be treated as current, not as a future buying deadline.
The USPS has approved a rate increase from $0.78 to $0.82 per ounce for First-Class letters, effective July 12, 2026 (PRC Docket R2026-1). For wedding couples planning mailings in the second half of 2026 or beyond, buying stamps now locks in the lower rate.
The savings grow further if you use leftover stamps for everyday mailing after the wedding. Since Forever Stamps never expire and always cover the current 1-ounce letter rate, any extra stamps remain fully useful for bills, cards, and general correspondence.
Common Wedding Postage Questions
Can I use Forever Stamps on RSVP envelopes?
Yes. Pre-stamping your RSVP envelopes with a Forever Stamp is standard etiquette for formal wedding invitations. Place the stamp on the smaller return envelope before inserting it into the outer invitation envelope. This makes it easy for guests to send their response without hunting for postage.
Do square invitation envelopes need extra postage?
Yes. Square envelopes are classified as non-machinable by USPS because they cannot run through standard sorting equipment. The current non-machinable surcharge is $0.49 on top of the base letter rate, bringing the total to approximately $1.31 per square envelope. You can pay this with a Forever Stamp plus an additional non-machinable surcharge stamp, or use a single stamp of sufficient denomination.
What if my invitation weighs more than 1 ounce?
Additional ounces cost $0.29 each. A 2-ounce invitation envelope requires one Forever Stamp ($0.82) plus one additional-ounce stamp ($0.29), totaling $1.11. Weigh a fully assembled sample envelope at home with a kitchen scale or at your local post office before buying stamps in bulk.
Should I buy stamps for thank-you cards at the same time as invitations?
Buying all your wedding stamps at once is usually the smartest move. It locks in today’s price, ensures you have a consistent design across all mailings, and avoids a second shopping trip in the busy post-wedding period. If you plan to use a different stamp design for thank-you cards, purchase both quantities now and store the thank-you stamps until you are ready to write your notes.
Do Forever Stamps expire?
No. Forever Stamps have no expiration date. They remain valid for the current First-Class 1-ounce letter rate indefinitely. Any unused wedding stamps can be applied to regular mail for years to come.
Buying Tips and Next Steps
Use this section as a practical checkpoint before you purchase:
- Count every mailing. Save-the-dates, invitations, RSVP envelopes, and thank-you cards all require their own stamps. Do not count only the main invitation.
- Weigh a sample envelope. Assemble one complete invitation with all inserts, wraps, and embellishments, then weigh it. If it exceeds 1 oz, budget for additional-ounce stamps.
- Check envelope shape. Square or oversized envelopes need extra postage. Confirm with USPS guidelines before ordering.
- Choose rolls for volume. Rolls of 100 are the most efficient format for wedding assembly. Books of 20 work well for smaller weddings or staged purchasing.
- Order unused, valid Forever Stamps. Whether you buy from USPS directly, a retail store, or an independent online stamp seller, make sure the stamps are unused, undamaged, and carry current USPS validity.
Sources and update note
Use the linked primary record for the exact issue, rule or current condition. Prices, availability and platform features can change and should be checked at the time of use.