Calculating Your Postage

If you measure your mailpiece or package and have an idea of how much it weighs, you can calculate the postage yourself.

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Just a few small changes can result in postage savings

  • Folding a sheet of paper in half will change the mailpiece from a "flat" sized piece to a "letter" sized piece and save you at least 44 cents.
  • If your letter is over 1/4" thick trifolded, unfold to the size of 1/2 sheet of paper and mail in a larger envelope up to 6-1/8" X 11-1/2" in size.  This will save you at least 44 cents.
  • Attaching a paper clip or a binder clip to several pieces of paper can change your mail piece from a "flat" sized piece to a "package" piece.  This will add at least 83 cents to your postage cost. 

USPS Tracking

If you have a USPS tracking number for your package, you may find out where it is with Track and Confirm.

Fall at UCO

First Class Mail

Estimated delivery time is 2 to 4 days depending upon the destination


  • 3-1/2" X 5" (minimum dimension)

  • 4-1/4" X 6" (maximum dimension)


  • 6-1/8" X 11" (maximum dimension)   
  • 1/4" (maximum thickness)

Note: Letters with nonmachinable characteristics (example: square envelopes or musical cards) may be subject to a surcharge or other standard rate.


  • 15" long X 12" high (maximum dimension)
  • 3/4" (maximum thickness)  

Note:  Flats must also meet other standards to qualify for flat-size postage rates such as flexibility.  Rigid flats must be priced at parcel rates.

***Estimated delivery time for the following classes of mail is between 5 to 7 days


  • Items that are not flats, letters or postcards such as thick envelopes, thick or rigid books, small and large boxes and poster tubes.

Media Mail

  • Printed matter such as books and brochures, recorded matter such as tapes, CDs and DVDs.