Dimensions are good, but you also need thickness and weight also. This tye of envelope- what type is it , regular brown or white paper or bubble mailer? What country are you sending it from? Usually all required information to use with web calculators.
USA First Class International for country rate 6 (includes Australia) $2.90 to $15.27 by ounce if under a pound for flats (which is what you are mailing). When over a pound, $30.85 2 lbs, $46.75 3 lb and 4 lbs for $62.90.
Check at your local Post Office to confirm or correct.
If it contains anything considered 'merchandise' (as opposed to simply correspondence), I think you will have to 'declare' it with the proper forms. I agree, go to PO and get their help. Be prepared for it to be costly. Don
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