How to Use the Reseller Margin Calculator
- Enter Item Costs: Input what you paid for the item wholesale/thrift and any packaging or outbound shipping costs.
- Configure Marketplace Fees: Enter the referral fee percentage and any per-transaction fixed fees charged by platforms like Amazon, eBay, or Shopify (or use the quick presets above).
- Set Profit Goal: Define your target profit margin percentage to instantly calculate the ideal competitive listing price.
Reseller Calculation Formula
To find the precise listing price ($P$) required to hit a target profit margin percentage ($M$), the calculation factors in both variable and fixed overhead expenses:
Listing Price = (Cost Price + Shipping Cost + Fixed Fee) / (1 - (Platform Fee % + Target Margin %) / 100)
Common Marketplace Fee Reference
| Marketplace | Referral Fee | Fixed Transaction Fee |
|---|---|---|
| Amazon FBA (Most Categories) | 15.0% | $0.30 (Variable FBA fulfillment separate) |
| eBay (Standard Account) | ~13.25% | $0.40 per order |
| Poshmark | 20.0% (Flat) | $0.00 |
| Shopify Payments | 2.9% | $0.30 |