Two Ounce Stamps Guide: When One Stamp Is Not Enough

By Sales Discount Stamps | Published June 10, 2026 | 5 min read

A standard one-ounce letter needs a Forever stamp ($0.82). A letter weighing more than one ounce but not more than two ounces needs $1.11 in postage. A Two Ounce stamp covers this exact amount in a single stamp.

When to Use a Two Ounce Stamp

  • Wedding invitations with an RSVP card and details card
  • Greeting cards with multiple photos or thick cardstock
  • Multi-page letters (4-6 pages of standard paper)
  • Any qualifying letter weighing 1-2 ounces

Two Ounce vs. Forever + Additional Ounce

A single Two Ounce stamp ($1.11) is equivalent to one Forever stamp ($0.82) plus one Additional Ounce stamp ($0.29). The result is the same postage value. The Two Ounce stamp simply offers the convenience of one stamp instead of two.

Common Mistake

Do not use a Two Ounce stamp on a one-ounce letter. You are overpaying $0.29. Use a regular Forever stamp for letters under one ounce.

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Frequently Asked Questions

Can I use two Forever stamps instead of one Two Ounce stamp?

Yes, but you are overpaying by $0.53. Two Forever stamps = $1.64. The actual two-ounce rate is $1.11. Using the correct stamp combination saves money on every heavier letter you mail.

What is the maximum weight for a letter before it becomes a large envelope?

3.5 ounces is the maximum weight for a First-Class Mail letter. Beyond that, the mailpiece is classified as a large envelope or flat, with different (usually higher) postage rates.

Are Two Ounce stamps good for wedding RSVP envelopes?

RSVP envelopes typically weigh well under one ounce. A regular Forever stamp ($0.82) is sufficient. Reserve Two Ounce stamps for the outer invitation envelope, which is usually heavier.

Current Product Examples

For a mailpiece that qualifies for the two-ounce stamped-letter category, review the Garden Corsage Two Ounce product details. The product cannot determine whether an envelope qualifies, so weigh and measure the finished piece first.

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.