A standard one-ounce First-Class Mail letter sent with Certified Mail currently costs $6.37: $0.82 postage plus the $5.55 Certified Mail fee. If you pay only with ordinary Forever stamps worth $0.82 each, you need eight stamps. Eight stamps total $6.56, so they overpay by $0.19. Certified Mail also requires its barcode and mailing process; simply adding eight stamps does not make an ordinary envelope Certified Mail.
Certified Mail cost and Forever-stamp conversion
| Service on a standard 1 oz letter | Current total | Whole Forever stamps | Overpayment |
|---|---|---|---|
| Certified Mail only | $0.82 + $5.55 = $6.37 | 8 ($6.56) | $0.19 |
| Certified Mail + electronic Return Receipt | $0.82 + $5.55 + $2.91 = $9.28 | 12 ($9.84) | $0.56 |
| Certified Mail + hard-copy Return Receipt | $0.82 + $5.55 + $4.65 = $11.02 | 14 ($11.48) | $0.46 |
These examples use USPS rates effective July 12, 2026. They assume a machinable domestic letter weighing no more than one ounce. Extra weight, a nonmachinable shape or a different mail class changes the base postage before the Certified Mail fee is added.
Why one Forever stamp is not enough
An ordinary Forever stamp pays only the current one-ounce First-Class Mail letter price. Certified Mail is an extra service purchased in addition to postage. It provides a mailing receipt and electronic verification that delivery or a delivery attempt occurred; it does not turn one ordinary stamp into payment for the service fee.
How to calculate your exact total
- Weigh and classify the sealed mailpiece.
- Find the correct base postage for its weight, shape and mail class.
- Add the current $5.55 Certified Mail fee.
- Add an electronic or hard-copy Return Receipt only if you need that optional record.
- Divide the total by the current $0.82 ordinary Forever value and round up if using only whole stamps.
Using exact-denomination postage or paying the service fee at the counter usually avoids the overpayment created by whole Forever stamps.
How to send it correctly
- Address the envelope and apply sufficient postage.
- Complete the Certified Mail barcode label and keep the sender’s receipt section.
- Request a Return Receipt only if you need the recipient signature record in that format.
- Present the item for acceptance or follow the instructions for an approved online Certified Mail label.
- Keep the receipt and tracking number until the record is no longer needed.
For the base postage first, use the Forever-stamp postage decision guide. Certified Mail proves mailing and delivery activity; it does not guarantee faster transit. For an IRS filing, first calculate the postage for the complete paper tax return and verify the current filing address.
Frequently asked questions
Can I pay Certified Mail fees with Forever stamps?
Valid postage stamps can contribute to the total postage and fees, but you must reach the full amount and still use the Certified Mail label and acceptance process. Exact payment avoids overpaying with whole stamps.
Does Certified Mail include a Return Receipt?
No. Certified Mail includes a mailing receipt and electronic delivery or attempted-delivery verification. Electronic and hard-copy Return Receipt options cost extra.
Do I need more stamps for a two-ounce certified letter?
Yes. First calculate the higher two-ounce base postage, then add the Certified Mail fee and any optional service. Do not reuse the one-ounce total.
Can I put the stamps on and drop the letter in a mailbox?
Use an acceptance method that provides the Certified Mail record you need. For a paper mailing receipt with a USPS acceptance mark, present the prepared item to a postal employee.
Rates and rules checked September 1, 2026: USPS Notice 123; USPS Certified Mail basics; USPS DMM 503. Rates and procedures can change.