Wedding Invitation Postage: Complete Guide

By Sales Discount Stamps | Published May 22, 2026 | 5 min read

Wedding invitations are one of the easiest places to make a postage mistake. A fully assembled suite can weigh 1.5 ounces or more.

Step 1: Assemble One Complete Invitation

Include everything: outer envelope, invitation card, details card, RSVP card, RSVP envelope, and any extras.

Step 2: Weigh It

Invitation card only: ~0.3-0.5 oz (one Forever stamp)
Invitation + RSVP: ~1.0-1.5 oz (may need extra postage)
Full suite with ribbon/extras: ~1.5-2.5 oz (definitely needs extra)

Step 3: Check for Surcharges

Square envelopes, wax seals, and ribbon trigger a $0.35 nonmachinable surcharge.

Postage Examples

Scenario	Weight	Postage	Stamps
Simple invite	Under 1 oz	$0.82	1 Forever
Invite + RSVP	1-2 oz	$1.11	1 Forever + 1 Add Oz
Square envelope suite	1-2 oz	$1.46	1 Forever + 1 Add Oz + surcharge

Wedding Stamps at Discount

Floral Forever stamp designs and Additional Ounce stamps can cover different parts of a guest-list mailing after the finished pieces are weighed and classified.

Shop Wedding Stamps

Frequently Asked Questions

Should I take a fully assembled invitation to the post office before buying stamps?

Yes. This is the single best piece of advice for wedding mail. Weigh one complete invitation, have USPS confirm the postage required, then buy stamps for the full guest list based on that confirmed rate.

Do I need to stamp the RSVP envelope?

Yes. Include a stamped RSVP envelope with each invitation. An RSVP postcard uses a postcard stamp ($0.65). An RSVP envelope uses one Forever stamp ($0.82).

How early should I order wedding stamps?

At least 6-8 weeks before you plan to mail invitations. This gives you time to receive the stamps, verify the count and condition, and address the envelopes without rushing.

Current Product Examples

After one fully assembled invitation is weighed and classified, compare Sunflower Bouquet Stamps and the Garden Corsage Two Ounce design. Confirm the rate category and quantity on the live product page.

Sources and Scope

U.S. Postal Service — Postal Explorer — Domestic Mail Manual, sections 101 and 201, physical standards for retail letters and cards.
U.S. Postal Service — Postal Explorer — Notice 123 Price List, First-Class Mail retail prices, effective July 12, 2026.

Rates apply only when the mailpiece qualifies for the stated category. Weight estimates are planning aids, not a substitute for weighing and measuring the finished piece.