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Tips and Tools for Measuring

Use these rulers and guide boxes to measure letters and large envelopes.

Once a piece of mail exceeds the maximum length, height, or thickness of one shape, it automatically gets classified as the next largest shape.

Minimum size for Postcards and Letters
5" long x 3-1/2" high

Maximum size for Postcards
6" long x 4-1/4" high

Maximum size for Letters
11-1/2" long x 6-1/8" high

Maximum thickness for Letters
1/4" thick

Maximum thickness for Large Envelopes
3/4" thick

Large Envelopes exceed one of the letter size maximum dimensions.

Unusual Shapes and Sizes

Sometimes a piece of mail requires additional postage because it is a certain shape or size that is difficult to process on mail sorting machines. To make sure you’re paying the correct postage, visit . These are examples of mail that could require additional postage:
  • Square envelopes
  • Envelopes on which the address is written parallel to the shorter edge square
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