Shipping Cost Per Package Calculator
Your cost per shipment = postage + (mailer pack ÷ count) + (tape roll ÷ shipments) + (label roll ÷ labels) + extras. Enter what you actually pay; the starting numbers are placeholders.
| Postage / label | $5.00 |
| Mailer | $0.20 |
| Tape | $0.10 |
| Label stock | $0.03 |
| Other | $0.10 |
| Per shipment | $5.43 |
Starting numbers are placeholders, not quotes. Enter what you actually pay. Put the supplies figure in "Other costs" on any fee calculator.
Use it with the fee calculators
Put the "supplies only" figure in Other costs on the eBay, Poshmark, Mercari or Whatnot calculator to see true profit per sale.
Restocking
Check current prices for poly mailers, 4x6 thermal labels and packing tape on Amazon. Unsure of sizes? See the poly mailer guide.
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FAQ
What counts as shipping supplies cost?
Anything used up per package: the mailer or box, tape, the thermal label itself, plus filler or inserts. Printers and scales are one-off equipment, so leave them out of the per-package number.
How do I work out the cost of one mailer?
Divide the pack price by the number in the pack. A $20 pack of 100 is $0.20 each. The calculator does this for mailers and labels.
Should I include postage if the buyer pays?
If the platform charges the buyer and gives you a prepaid label (as Poshmark does), set postage to 0 and count only your supplies.