Shipping · USPS

USPS postage calculator.

Letters, large envelopes, postcards and packages priced from USPS’s own Notice 123 price list. Choose your zone from the official Zone Chart; nothing here contacts USPS.

A 1 oz letter costs $0.82 to mail with a stamp. A 1 lb package costs $10.05 by Ground Advantage to zone 1 and $11.70 to zone 5; Priority Mail for the same pound is $11.50 and $14.05. Zones come from the USPS Zone Chart.

USPS Notice 123Effective Oct 4, 2026Read 18 Oct 2026

Inputs

What are you mailing?

Weight: pounds

plus ounces

Shipping zone USPS zones come from the origin and destination ZIP codes. Look yours up on the official USPS Zone Chart, then pick it here. This tool never contacts USPS.

Price type Notice 123 lists Commercial prices separately. Commercial prices have payment-method rules: Ground Advantage under DMM 283.1.2 (PC Postage with a qualifying label, an approved IBI meter or permit imprint) and Priority Mail under DMM 223.1.2 (Click-N-Ship, PC Postage with a qualifying label or permit imprint). If you pay at the counter, use Retail.

Contents qualify for Media Mail (books, printed music, recordings; see the Media Mail page)

Size details (optional): dimensional weight and nonstandard fees

Length (in)

Width (in)

Height (in)

Not a rectangular box (applies the 0.785 factor) Fill all three to apply dimensional weight (parcels over 1,728 cubic inches pay the greater of actual or dimensional weight; USPS divisor 139) and to set the length and cube fees automatically. Otherwise use the fee controls below.

Longest side

Volume over 2 cubic feet (3,456 cubic inches)
Tube, roll, can, wooden or metal box, or large liquid container
Length plus girth over 108 inches (up to 130): oversized price applies

Postage

Enter the details to see the postage.

How the USPS postage calculator works

Pick what you are mailing. Letters, large envelopes and postcards use the First-Class Mail single-piece tables. Packages are priced by weight and zone for USPS Ground Advantage and Priority Mail, with Media Mail added when the contents qualify. The result lists every service from cheapest to dearest and shows how the weight was billed.

Ground Advantage steps up at 4, 8, 12 and 15.999 oz, then by the whole pound (DMM 133.1.2). Priority Mail and Media Mail charge by the pound or fraction of a pound. Parcels over 1 cubic foot are billed on dimensional weight when it is higher (divisor 139 under the current DMM), and length, volume and shape fees apply as listed in Notice 123.

Letter and large envelope prices

First-Class Mail letters, retail stamped
Letter weight	Stamped
Up to 1 oz	$0.82
Up to 2 oz	$1.11
Up to 3 oz	$1.40
Up to 3.5 oz	$1.69

Metered or online letter postage is lower: $0.78 at 1 oz, $1.07 at 2 oz, $1.36 at 3 oz, $1.65 at 3.5 oz. Letters over 3.5 oz pay the large envelope prices on the large envelope page. Postcards are $0.65.

Pick the service for your parcel

Ground Advantage rates: the usual economy choice for packages up to 70 lb.
Priority Mail rates and Flat Rate prices: faster service objective, flat rate boxes at a fixed price.
Media Mail rates: cheapest per pound, but only for qualifying contents.
Mailing abroad? International letter rates.

Frequently asked questions

How much does it cost to mail a letter with USPS?

A standard letter up to 1 oz costs $0.82 with a stamp, $0.78 with metered or online postage. Each additional ounce adds $0.29 up to 3 oz, and 3.5 oz is $1.69. Nonmachinable letters add $0.49 (Notice 123, First-Class Mail retail).

How much is it to mail a 1 lb package?

At retail, USPS Ground Advantage for 1 lb costs $10.05 in zone 1 up to $13.65 in zones 8 and 9. Priority Mail for 1 lb costs $11.50 in zone 1 up to $17.95 in zone 8. Media Mail for 1 lb is $4.39 if the contents qualify.

Is Ground Advantage or Priority Mail cheaper?

In the Notice 123 retail tables Ground Advantage is priced at or below Priority Mail at every weight and zone; the calculator compares the two for your exact weight and zone. Priority Mail has a 2 to 3 day service objective that USPS does not guarantee (DMM 123); Ground Advantage delivery is not guaranteed either (DMM 133).

How do I find my USPS zone?

Zones depend on the origin and destination ZIP codes. Use the official USPS Domestic Zone Chart, enter the first three digits of each ZIP code, then choose that zone here. This site never queries USPS for you.

When do USPS prices change?

USPS usually updates its prices in January and July and can also change them at other times. This page is built from Notice 123 effective October 4, 2026. Check the effective date at the top of the official Notice 123; if a newer one is in force, use its figures.

Sources

Checked18 October 2026

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Prices change: check the date

These figures are USPS list prices from Notice 123 (Price List), effective October 4, 2026, read on 18 October 2026. USPS usually updates prices in January and July and can change them at other times, so if today is after a newer Notice 123 took effect, the official notice wins. Extra services (insurance, tracking add-ons, signature, pickup) and taxes are not included.