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The standard amount of stamps needed for a regular envelope is currently $0.55 for a one-ounce letter.
If your envelope is larger than the standard size, you will need additional stamps. For every additional ounce, you will need to add $0.20 of postage. For example, a two-ounce letter would require $0.75 in postage.
Yes, square envelopes require additional postage due to their non-standard size and shape. The current rate for a square envelope is $0.70 for the first ounce and $0.20 for each additional ounce.
The amount of postage needed for international mail varies depending on the destination and weight of the envelope. You can use the USPS Postage Calculator to determine the exact amount of postage needed for your international mail.
As long as the stamps have not been used or damaged, you can use old stamps on your envelope. However, you will need to make sure that the total value of the stamps meets or exceeds the current postage rate for your envelope.