USPS First-Class Mail: A Practical Guide

First-Class Mail is the Postal Service’s standard service for letters, greeting cards, postcards, and large envelopes — the mail most households and small businesses send every week. It is priced by weight and shape rather than distance, typically arrives in 1–5 business days, and includes forwarding and return if a piece cannot be delivered as addressed. This practical guide explains what First-Class Mail covers, what it costs at current prices (in effect since July 12, 2026), the size and weight limits that decide what you pay, and when a different service makes more sense. It is part of our Postage & Stamp Guides center.

What First-Class Mail Is Used For

First-Class Mail handles three shapes of mailpiece:

• Letters — standard envelopes up to 3.5 ounces: personal letters, greeting cards, bills, statements, checks, and documents.
• Postcards — single cards within postcard size limits, with no envelope.
• Large envelopes (flats) — oversized envelopes up to 13 ounces: catalogs, magazines, large documents, and card stock too big for letter dimensions.

Businesses are required to use First-Class Mail (or faster) for certain kinds of content — bills, invoices, account statements, and personalized correspondence — which is one reason it remains the backbone of everyday mail. Small packages are no longer part of the service for most senders: items that are rigid, thick like a parcel, or over 13 ounces move to package services such as USPS Ground Advantage.

How Long Does First-Class Mail Take?

USPS describes First-Class Mail delivery as 1–5 business days, depending on where a piece enters the mail and where it is going. Mail dropped near its destination often arrives at the fast end of that range; cross-country mail takes longer. Two honest qualifications:

• The 1–5 day figure is a service expectation, not a guarantee. Standard First-Class letters carry no delivery-date promise and no built-in tracking.
• Volume surges — above all the December holiday season — stretch delivery times. This is why USPS publishes recommended holiday mailing dates each fall; for 2026, it advises sending First-Class Mail by December 17 for expected delivery before December 25.

Current First-Class Mail Prices

Retail (single-piece) prices under the USPS price list in effect since July 12, 2026:

Mailpiece	Price	Notes
Letter, 1 oz (stamped)	$0.82	The Forever stamp price
Letter, each additional ounce	$0.29	Up to the 3.5 oz letter maximum: 2 oz = $1.11, 3 oz = $1.40, 3.5 oz = $1.69
Letter, 1 oz (metered or printed postage)	$0.78	Postage-meter and approved online-postage rate
Postcard	$0.65	Standard postcard size only; oversized postcards pay letter prices
Large envelope (flat), 1 oz	$1.69	Then 29¢ for each additional ounce for the first several ounces, up to 13 oz
Nonmachinable surcharge	+$0.49	Added to letter prices for square, rigid, lumpy, or clasp/string envelopes
International letter, 1 oz	$1.75	One Global Forever stamp; heavier letters priced by destination

Price is never based on how far a letter travels within the United States — a letter across town and a letter across the country cost the same. Distance-based pricing only enters the picture with package services.

Size and Weight Limits That Decide Your Price

Whether a piece is priced as a letter, a postcard, or a large envelope depends on its dimensions, not on what you call it:

	Postcard	Letter	Large envelope (flat)
Length	5–6 in	5–11.5 in	11.5–15 in
Height	3.5–4.25 in	3.5–6.125 in	6.125–12 in
Thickness	0.007–0.016 in	0.007–0.25 in	Up to 0.75 in
Maximum weight	—	3.5 oz	13 oz

Crossing a boundary moves the whole piece into the next pricing category. A letter that grows past 3.5 ounces, or an envelope thicker than a quarter inch, is charged large-envelope prices even if it looks like an ordinary letter. The dimension rules in detail — including the flexibility and uniformity tests USPS applies — are covered in USPS Letter Size and Weight Requirements, and flat pricing is worked through in How to Calculate Postage for Large Envelopes.

Stamped vs. Metered: A 4-Cent Difference

A 1-ounce letter costs $0.82 with a stamp but $0.78 with metered postage — printed by a postage meter or an approved online postage service. The 4-cent gap is deliberate: USPS prices printed postage slightly lower. For a household mailing holiday cards once a year, the difference is trivial and stamps are simpler. For a business mailing hundreds of letters a month, metered postage (and the commercial pricing below) is real money, and it is also why many small offices print postage rather than stocking stamp books.

What Is Included — and What Is Not

• Included: forwarding to a new address when the recipient has filed a change-of-address, and return to the sender when a piece is undeliverable as addressed (return may require the sender’s return address and proper endorsements in some cases). First-Class content is also sealed against postal inspection under federal law.
• Not included: tracking for ordinary letters and postcards, insurance against loss or damage, and a guaranteed delivery date.
• Available as paid extras: services such as Certified Mail (proof of mailing and a delivery record), Certificate of Mailing, and Registered Mail for high-value documents. If you need proof a letter arrived, one of these — not a fancier stamp — is the upgrade that matters.

First-Class Mail vs. USPS Marketing Mail

The other service households and businesses sometimes confuse with First-Class is USPS Marketing Mail — the class used for advertising flyers, catalogs, and bulk promotions. Marketing Mail is cheaper per piece, but the trade-offs are substantial: delivery is slower and less predictable, it requires bulk quantities and permit-based preparation, and — most importantly for anything addressed to a person rather than a mailbox — it is generally not forwarded or returned when the address is wrong. A change of address simply ends its journey. Bills, statements, personal letters, and greeting cards belong in First-Class Mail, both because USPS rules require First-Class handling for personal and transactional correspondence and because the forwarding and return safety net is part of what you are paying for.

Commercial and Bulk First-Class Pricing

Businesses mailing at volume do not pay the retail prices above. Presorted First-Class Mail — mail prepared and sorted to USPS specifications, in minimum quantities of 500 pieces — costs substantially less per letter, and presorted letters pay one price for weights up to 3.5 ounces rather than stepping up by the ounce. The trade-off is preparation work: address quality standards, sorting, and either permit imprint or metered payment. For an occasional bulk mailing, such as a company’s holiday cards, our guide to Planning a Bulk Holiday Mailing Campaign discusses when the savings justify the setup.

Preparing a First-Class Letter, Step by Step

1. Choose an envelope inside letter dimensions and keep contents flat and evenly distributed.
2. Weigh the sealed piece and round up to the next whole ounce.
3. Address it in the standard format — recipient centered, return address in the upper-left — following How to Address an Envelope in the USA.
4. Apply postage in the upper-right corner: one Forever stamp for the first ounce, plus additional-ounce stamps (29¢ each) for extra weight, and allow for the 49-cent surcharge if the envelope is square or rigid.
5. Mail it through any collection box, Post Office, or your own mailbox pickup where available.

Three Pieces, Priced Step by Step

The tables above become clearer with actual mail on the scale:

• A greeting card with a photo inside, 1.6 ounces, standard envelope. Shape: letter. Weight rounds up to 2 ounces. Price: $0.82 + $0.29 = $1.11 — one Forever stamp plus one additional-ounce stamp.
• A wedding invitation suite in a square envelope, 0.9 ounces. Shape: letter, but nonmachinable. Price: $0.82 + the $0.49 surcharge = $1.31, despite weighing less than the first example. Shape beat weight.
• A 3-ounce catalog in a 10 × 13 envelope. Shape: large envelope — it exceeds letter dimensions regardless of weight. Price: $1.69 for the first ounce, plus 29 cents for each additional ounce = $2.27. The same catalog folded into a letter-size envelope (if it fit the thickness limit) would have cost $1.40 as a 3-ounce letter; packaging decides the category before the scale does.

First-Class Mail From Atlanta: Two Senders, Priced and Timed

This guide is edited from Atlanta, so here is what the system above looks like from a Peachtree Street address.

A small business mailing statements. A professional office on Peachtree St NE (Atlanta, GA 30303) mails 300 account statements a month, each a two-page letter in a standard envelope at just under an ounce. As stamped mail, that is 300 × $0.82 = $246.00. Metered, the same letters cost 300 × $0.78 = $234.00 — the 4-cent meter discount returns $12.00 a month, every month, which is why offices that mail weekly print postage instead of stocking stamp books. Either way the mail is First-Class, because statements are exactly the transactional content the class exists for — and because forwarding and return bring the bad addresses back to be fixed instead of vanishing the way Marketing Mail would.

A household sender, and what “1–5 business days” feels like. The same week, a Midtown household mails three First-Class pieces: a card to Decatur, a letter to family in Chicago, and a documents envelope to Seattle. In our experience, the Decatur card is the quick one and the Seattle piece is the one that uses the far end of the published range — mail dropped near its destination tends to land at the fast end of 1–5 business days, and cross-country mail at the slower end. That is experience, not a schedule: USPS publishes the 1–5 business day range as an expectation, standard letters carry no tracking and no delivery-date guarantee, and December volume stretches everything. Which is why the practical rule on this page is the one in the Key Takeaways — for holiday delivery in 2026, work to the recommended December 17 send-by date and treat anything faster as a pleasant surprise.

Common Mistakes

• Judging by appearance instead of category. A slim 9 × 12 envelope “looks like a letter” but is priced as a flat at $1.69 minimum. Dimensions, not impressions, set the price.
• Assuming a heavier letter just needs “another stamp.” Over 3.5 ounces a piece leaves the letter category entirely and is repriced as a flat — the math restarts, it does not simply continue.
• Mailing time-sensitive documents at the December peak without a cushion. The 1–5 business day range is a normal-times expectation. Against the recommended December 17 send-by date for holiday delivery, plan margin rather than counting on the fast end of the range.
• Expecting tracking that is not there. A plain First-Class letter cannot be followed or traced. If losing sight of the piece would be a problem, the answer is a paid extra like Certified Mail or a package service — not a note to the recipient to watch for it.
• Sending marketing-style mail as First-Class by default, or personal mail as Marketing Mail to save money. The classes are not interchangeable: Marketing Mail is not forwarded or returned, and personal or transactional content belongs in First-Class.

When First-Class Mail Is the Wrong Choice

• Small packages: anything over 13 ounces, or parcel-shaped, belongs in USPS Ground Advantage or a Priority service.
• Hard deadlines: if a document absolutely must arrive by a specific date, Priority Mail or Priority Mail Express offers faster, tracked service; a standard letter does not.
• Proof of delivery: add Certified Mail or use a tracked service rather than hoping a plain letter can be traced — it cannot.
• Oversized postcards and odd shapes: pieces outside every category above are charged package prices, which can be a surprise at the counter.

The Bottom Line

First-Class Mail is the default for letters, cards, and flats for good reasons: one national price by weight and shape, 1–5 business day delivery, and forwarding and return built in. Know the three numbers that govern most mail — $0.82 for the first ounce of a letter, 29 cents for each added ounce, and $1.69 where large envelopes begin — respect the size limits, and you will price nearly anything correctly. For the stamp at the center of the system, see What Is a Forever Stamp?

Frequently Asked Questions

Does First-Class Mail cost more to send across the country?

No. Letter, postcard, and flat prices are national — one rate to any U.S. address, including Alaska, Hawaii, and the territories. Only international mail and packages introduce destination-based pricing.

Can I drop a 3.5-ounce letter in a collection box?

Yes — anything within First-Class letter limits with correct postage can go in any collection box or outgoing mailbox. Heavier or thicker pieces should be checked against the flat and package rules first.

What happens to a First-Class letter with a bad address?

If the recipient filed a change of address, it is forwarded; if it cannot be delivered or forwarded, it is returned to the sender — which is why a clear return address in the upper-left corner matters.

Is First-Class Mail insured?

No. Loss and damage are not covered for ordinary letters and flats; valuable documents should travel by Registered Mail or another service with protection.

Sources

The rates, dates, and rules in this guide were checked against these official USPS pages:

• USPS: First-Class Mail
• USPS: Types Of First Class Mail
• USPS News Release (Sep 22, 2026): Recommended 2026 Holiday Mailing and Shipping Dates

Related Guides

• Postage & Stamp Guides — the full library of postage and stamp help.
• What Is a Forever Stamp? — the stamp at the center of the First-Class system.
• How Many Stamps Do I Need for a Letter? — letter postage, weight by weight.
• How to Calculate Postage for Large Envelopes — flat pricing worked through step by step.

Rates on this page reflect the USPS price list in effect since July 12, 2026, and are reviewed when USPS announces price changes.