If you have ever wondered whether you are using Forever Stamps correctly—or whether you even need more than one on a given envelope—this guide walks you through every practical step. We cover the basic mechanics, the weight rules that sometimes require a second stamp, and the real-world scenarios where stocking up before a rate increase makes financial sense.
Using stamp value on packages
Valid unused stamps can contribute postal value beyond letters, but package acceptance and deposit rules matter. A stamped package may need to be presented at a Post Office depending on weight, thickness, security rules and services. Do not reduce the rule to ‘Forever stamps cannot be used on packages,’ and do not assume a collection box is permitted.
What Makes a Forever Stamp Different
USPS rates effective July 12, 2026 are $0.82 for a stamped one-ounce letter, $1.11 for 2 ounces, $1.40 for 3 ounces and $1.69 for 3.5 ounces. The additional-ounce amount is $0.29 and the letter nonmachinable surcharge is $0.49.
This feature makes Forever Stamps the simplest option for everyday personal and business mail. You do not need to look up current rates, add 1-cent or 2-cent makeup stamps, or worry about using stamps printed five or ten years ago.
How to Apply a Forever Stamp to an Envelope
Using a Forever Stamp requires no special knowledge beyond basic letter mailing, but a few details help ensure your mail is processed smoothly:
- Prepare your envelope. Address the front of the envelope with the recipient’s address in the center and your return address in the upper-left corner.
- Affix the stamp. Place one Forever Stamp in the upper-right corner of the envelope’s front face. Remove the backing and press firmly so the stamp adheres evenly.
- Verify weight. A standard letter weighing 1 oz. or less needs one Forever Stamp. Letters between 1 oz. and 2 oz. require additional postage—currently $0.29 per additional ounce for First-Class letters.
- Mail it. Drop the letter in a USPS collection box, hand it to a mail carrier, leave it in your residential mailbox with the flag up, or bring it to a post office counter.
How Many Forever Stamps Do You Need?
The number of stamps depends on the weight, size, and shape of your mailpiece. Most everyday letters need just one Forever Stamp, but heavier or non-standard items require more. Here is a practical reference:
| Mailpiece Type | Weight | Forever Stamps Needed | Additional Postage |
|---|---|---|---|
| Standard letter | Up to 1 oz. | 1 Forever Stamp | None |
| Heavy letter | 1–2 oz. | 1 Forever Stamp + $0.29 | Additional-ounce rate |
| Heavy letter | 2–3 oz. | 1 Forever Stamp + $0.65 | Two additional-ounce stamps |
| Large envelope (flat) | Up to 1 oz. | 1 Forever Stamp ($0.82) | Flat rate starts at $1.39; additional postage may be due |
| Small package (First-Class Package) | Up to 13 oz. | Not priced by stamp count | Use USPS retail or online postage |
For a heavier letter—say, a greeting card with a photo insert that weighs 2 oz.—you would place one Forever Stamp plus one additional-ounce stamp (currently $0.29). If you only have Forever Stamps on hand, you can place two Forever Stamps, though you would technically be overpaying by about $0.50. For occasional household mailers, that small overage may be acceptable for the sake of convenience.
Oversized and Non-Machinable Surcharge
Certain letters cost more to mail even if they are under 1 oz. USPS charges a non-machinable surcharge (currently $0.49) when an envelope is rigid, square, has clasps, or exceeds standard dimensions. If your letter qualifies, you need one Forever Stamp plus one non-machinable surcharge stamp or equivalent postage. Common examples include envelopes with wax seals, rigid card inserts, or invitation envelopes that are square rather than rectangular.
Common Everyday Uses for Forever Stamps
Forever Stamps work for any First-Class Mail letter. Here are the most frequent real-world scenarios where households and small businesses use them:
- Personal correspondence: Thank-you notes, birthday cards, sympathy cards, and general letters to family or friends.
- Bill payments by mail: Utility bills, credit card payments, insurance premiums, and any business reply envelope where you supply postage.
- Greeting cards and holiday cards: Standard-weight Christmas cards, Hanukkah cards, Valentine’s Day cards, and seasonal mailings. Most single-card envelopes weigh well under 1 oz.
- Wedding invitations and save-the-dates: Standard A7 invitation envelopes often need one Forever Stamp, though heavier suites with multiple inserts or square envelopes may need additional postage. Always weigh your assembled invitation at the post office before mailing.
- Small business invoices and statements: Printed invoices, client letters, and account statements mailed in standard #10 envelopes.
- RSVP envelopes: The pre-stamped RSVP envelope you include with a wedding or party invitation. One Forever Stamp on the return envelope covers a standard 1-oz. response card.
- Postcards: Postcard postage is actually cheaper than a letter ($0.65 as of 2025), so using a Forever Stamp on a postcard means you are slightly overpaying. If you only have Forever Stamps on hand, the postcard will still be delivered, but a dedicated postcard stamp saves money on volume mailings.
Using Forever Stamps for Wedding Invitations
Wedding invitations are one of the most popular reasons people buy Forever Stamps in bulk. A typical wedding invitation mailing involves two stamp moments: one stamp on the outer invitation envelope sent to guests and one stamp on the RSVP return envelope included inside.
Wedding Postage Planning Example
| Item | Qty (100 guests) | Stamps per Piece | Total Forever Stamps |
|---|---|---|---|
| Outer invitation envelope | 100 | 1 | 100 |
| RSVP return envelope | 100 | 1 | 100 |
| Total | 200 |
Always weigh a fully assembled invitation at the post office before buying postage. Heavier suites with ribbon, layered cardstock, or oversized envelopes may require additional postage beyond a single Forever Stamp. Non-square, non-rigid envelopes that fall within standard letter dimensions are your safest bet for one-stamp mailing.
Using Forever Stamps for Holiday Cards
Can You Use Forever Stamps on Packages?
Forever Stamps are designed for letters and flats, not packages. First-Class Package Service uses a weight-and-zone pricing model that does not align with letter-rate stamps. While you can technically affix enough Forever Stamps to a small package to cover the postage amount, USPS retail counter staff may redirect you to purchase proper package postage. For packages under 13 oz., online postage purchased through USPS or a shipping platform is typically more efficient and often cheaper.
For heavier items, Priority Mail Flat Rate boxes and envelopes offer a simpler alternative—you pay one price regardless of weight (up to 70 lbs.) or domestic destination.
Do Forever Stamps Expire?
No. Forever Stamps do not have an expiration date. A Forever Stamp purchased in 2007, when they were first introduced at $0.41, is still valid today for a 1-oz. letter even though the rate has risen to $0.82. This is the core value proposition: buying stamps at today’s price protects you from future increases without any time pressure to use them.
If you find old Forever Stamps in a desk drawer, they are still usable as long as they have not been previously affixed to mail, cancelled, or damaged. The stamp’s face value always matches the current First-Class letter rate at the time you mail the letter.
How to Store Forever Stamps
Forever Stamps remain valid indefinitely, but proper storage preserves their adhesive quality and appearance:
- Keep stamps in a cool, dry place. Heat and humidity can weaken the adhesive backing.
- Leave stamps in the booklet or pane. The packaging protects the stamps from bending, moisture, and accidental damage.
- Store flat. Rolled or folded stamps may not adhere smoothly when applied to an envelope.
- Avoid direct sunlight. Prolonged UV exposure can fade stamp designs over time, though the postage validity remains.
A desk drawer, filing cabinet, or dedicated stationery box works well for most households. Small businesses that mail regularly may keep a roll of 100 stamps near their mailing station for quick access.
Buying Forever Stamps in Bulk: Books, Rolls, and Sheets
Forever Stamps come in several quantities to match different mailing volumes:
| Format | Quantity | Face Value (at $0.82) | Best For |
|---|---|---|---|
| Booklet | 20 stamps | $16.40 | Occasional household mailers |
| Pane / Sheet | 20 stamps | $16.40 | Collectors, design variety |
| Roll | 100 stamps | $82.00 | Small businesses, wedding mailings, holiday cards |
If you mail letters regularly—whether for personal correspondence, small business invoices, or seasonal cards—buying a roll of 100 stamps reduces the frequency of reordering and lets you lock in the current rate before increases take effect. At $0.82 per stamp, a roll of 100 costs $82.00 at face value. Purchasing unused valid Forever Stamps at a lower per-stamp price from an independent seller can reduce that cost, making year-round postage planning more affordable.
Frequently Asked Questions
Can I use a Forever Stamp on a large envelope or flat?
A Forever Stamp is worth $0.82 in postage. Large envelopes (flats) start at approximately $1.39 for 1 oz. of First-Class Mail. You would need two Forever Stamps ($1.56) to cover the base flat rate, though you would be slightly overpaying. For flats, weighing the piece and using the exact postage is more cost-effective than guessing with letter-rate stamps.
Do Forever Stamps work for international mail?
A single Forever Stamp covers domestic U. S. First-Class letter postage only. International letters require Global Forever Stamps, which are sold separately at the current international first-class letter rate. A domestic Forever Stamp cannot be used alone on international mail; you would need to add additional postage to reach the international rate.
What if I put too many stamps on a letter?
USPS does not refund overpayment for stamp postage. If you place two Forever Stamps on a standard 1-oz. letter, the letter will be delivered, but you have paid about $0.82 more than necessary. This sometimes happens when senders are unsure about weight. A small kitchen scale or a quick visit to the post office lobby scale can prevent this.
Can I use Forever Stamps on metered mail or packages?
Forever Stamps are intended for standard letter-rate First-Class Mail. Metered mail uses a postage meter imprint rather than stamps. For packages, First-Class Package Service and Priority Mail have their own pricing structures. You can technically affix stamps to cover package postage, but using calculated shipping postage is more practical for anything beyond a small, light parcel.
Are Forever Stamps from old designs still valid?
Yes. Every Forever Stamp ever issued—regardless of design, year of issue, or where it was purchased—is valid for a current 1-oz. First-Class letter. USPS has issued hundreds of Forever Stamp designs since 2007, including commemorative and seasonal themes. Any unused, uncanceled Forever Stamp is fully valid.
How do I know if my letter needs more than one stamp?
Weigh your letter. Standard envelopes up to 1 oz. need one Forever Stamp. Each additional ounce costs $0.29. If your letter is rigid, square, or non-standard in shape, it may incur a non-machinable surcharge of $0.49. When in doubt, bring the assembled envelope to a post office and ask a clerk to weigh and measure it.
Putting It All Together
Forever Stamps are designed for simplicity: one stamp, one standard letter, anywhere in the United States, no expiration date. The practical steps are straightforward—buy stamps at the current rate, store them properly, and use them as you mail letters, cards, invitations, and routine correspondence throughout the year.
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.