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  • First-Class Mail Postage | USPS
    Standard-sized, rectangular envelope stamps start at $0 78 Square, oversized, or unusually shaped envelope stamps start at $1 27 Standard-sized, rectangular postcard stamps start at $0 61 Oversized postcards need letter stamps, which start at $0 78 Large envelopes (flats) start at $1 63
  • Envelope Dimensions Guide: Standard Sizes USPS First Class Mail
    For a letter size to qualify as first class mail, the length must be between 5 and 11 1 2 inches, the height between 3 1 2 and 6 1 8 inches, and the thickness between 0 007 and 1 4 inch
  • USPS First-Class Mail Explained: Delivery Time, Weight Limits Add-Ons . . .
    Learn what USPS First-Class Mail includes, how long it takes, its weight and size limits, tracking add-ons, and when to use it Need the exact 2026 stamp price chart? See USPS postage rates
  • How Thick Can a First-Class Envelope Be? - LegalClarity
    A First-Class letter can be no thicker than 1 4 inch and no thinner than 0 007 inch If your letter is larger than 4-1 4 inches tall or 6 inches long, the minimum thickness rises to 0 009 inch
  • USPS First-Class Mail and Packages | Anytime Mailbox
    First Class Mail Letters are mail in envelopes that can measure between 3 5 x 5 inches or 6 x 11 5 inches The maximum thickness allowed for this type is a quarter of an inch, while the maximum weight mailable is 3 5 ounces
  • USPS First Class Package Service - Rates, Costs Size Limits - Shippo
    In this detailed guide, we'll explore what is first class package service, compare costs with other USPS services, explain weight and size restrictions, and show you how to save money on first-class shipping with commercial rates through Shippo
  • What Is First-Class Mail vs Regular Mail? | Pitney Bowes
    First-Class Package Service: Retail packages can weigh up to 13 oz; USPS First-Class Package commercial mail can reach 15 999 oz, with a combined length and girth under 108"
  • First-Class Mail - Regulations. gov
    Weight, Size, Shape Requirements Maximum weight for First-Class Mail letters is 3 5 oz; for large First-Class Mail envelopes and parcels, the maximum weight is 13 oz All postcards and envelopes (or flats) must be rectangular, otherwise an additional charge may apply
  • What is the USPS First Class Package Size? - PostPony
    Send standard postcards, notes, and large envelopes and small packages via USPS, up to 15 99 ounces using first-class mail If your first class bag is more than 15 99 ounces, you must upgrade your mail class to priority mail
  • How Many Stamps Do I Need? (2026 USPS Calculator + Guide)
    USPS stamp calculator (2026) Free stamp calculator for domestic USPS First-Class mail— letters, large envelopes (flats), and common surcharges Enter weight, dimensions, and handling flags to see totals aligned with March 2026 (verified) retail tables Postage depends on weight, dimensions, and how the piece moves through USPS equipment





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