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4.1 OZ
That would depend on where in the world you were sending it from. Your local post office would have the current rates.
about $13
First Class Letters (1 oz.) $0.44. Each additional ounce will cost an extra $0.20
how much a first letter that weighs 2.1 oz cost to mail
.45 + .20 = .65
61 cents
As of January 2014, it costs $1.15 to mail a regular one-ounce letter from the US to Canada, not including any extra services.
$3.04 as of 2016.
61 cents according to the USPS website.
Calculate below. 1st Class can be used for up to 13 oz, but rigidity, shape and thickness may all effect pricing.
Postage is $0,75 for up to 1 oz.