Machinable Letters and Cards
If you prepare your letters and cards so that they have an accurate address and can be processed on Postal Service equipment, your mail is
"machinable" and eligible for "presort" prices. Machinable mailpieces must meet specific standards, including size, shape, and weight.
Maximum weight: First-Class Mail, machinable letters and Standard Mail machinable letters: 3.3 ounces, Periodicals letters: 3.5 ounces.
Machinable letters must not meet any of the nonmachinable characteristics.
- Minimum: 5 inches long, 3-1/2 inches high, and 0.007 inch thick.
- Maximum for First-Class Mail card prices: 6 inches long, 4-1/4 inches high, and 0.016 inch thick.
- Maximum for letters and other cards: 11-1/2 inches long, 6-1/8 inches high, and 1/4 inch thick.
- Rectangular, with four square corners and parallel opposite sides. Letter-size, card-type mailpieces made of cardstock may have finished
corners that do not exceed a radius of 1/8 inch.