Question 1

What is COGS for resellers?

Accepted Answer

Cost of goods sold (COGS) is the total direct cost of acquiring the inventory you resell. For online resellers that includes the purchase price, inbound shipping, import or customs fees, prep and packaging, and any other cost required to get the item ready to list.

Question 2

How do I calculate Amazon FBA profit margin?

Accepted Answer

Subtract your total per-unit cost (purchase price + inbound shipping + prep + Amazon's 15% referral fee + FBA fulfillment fee + returns allowance) from your selling price, then divide the result by your selling price to get net margin as a percentage.

Question 3

What fees does eBay charge sellers?

Accepted Answer

eBay charges most categories a 13.25% final value fee plus $0.30 per order as of 2025. Rates vary by category and by store subscription level; this calculator uses the default rate and lets you override it.

Question 4

How do I calculate break-even selling price?

Accepted Answer

Break-even price is the selling price at which profit equals zero after variable percentage fees. The formula is: fixed costs per unit divided by (1 minus platform and payment fee percentages). This calculator does it automatically.

Know Your Real Profit Before You List

What are you selling?

What did it cost you to acquire this inventory?

Where are you selling and what does it cost?

Optional: refine your calculation

Know Your Real Profit Before You List

What are you selling?

What did it cost you to acquire this inventory?

Where are you selling and what does it cost?

Optional: refine your calculation