SPEED -- even if you think postal mail is slow, First-Class postal mail is faster than "bulk" mail. Use when delivery within a few days is important and acceptable.
Maximum size of a letter - 6 1/8" high (vertical) x 11.5 inches" long
Don't turn the piece 90 degrees or the rate goes up. Measure it as if you were reading the address; that dimension is the horizontal.
Anything larger (such as a 9 x 12" envelope) is a flat and costs more.
Minimum size of a mailpiece is 3.5" high x 5" long. Anything smaller cannot be mailed or will be subject to a non-standard surcharge. It'll cost you more!
WEIGHT LIMITS FOR FIRST-CLASS MAIL
Rates go up for each additional ounce up to 13 ounces. Above 13 ounces, use Priority Mail weight/rate charts.
- 37 cents for the first ounce
- 23 cents for each additional ounce up to 13 ounces total
- If larger than 6 1/8 x 11 1/2 but not more than an ounce,
- you pay non-standard surcharge of 12 cents plus 37 = 49 cents
FIRST-CLASS LETTERS 1 oz each additional ounce up to 13 oz. total Maximum: No bigger than 37 cents +23 cents 6 1/8" high (vertical) x 11.5" long (horizontal) If larger than above 37 cents + 12 cents = 49 cents but not heavier than an ounce, non-standard surcharge applies If heavier than 13 ounces, obtain Priority Mail weight/rate charts. Minimum: Mail smaller than 3.5"x 5" is technically prohibited from the mails. Vertical/horizontal directions are determined by the orientation of the address. When reading the address, that dimension becomes the horizontal. Do not turn the mailpiece 90 degrees so that it is much taller than it is wide. If you do this, you will have to pay postage surcharges.
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Waltham MA 02452
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