A SellerBay reselling guide
How to calculate resale profit and choose a selling price
Work out resale profit after product costs, delivery and fees. Learn the difference between markup and margin, then set a price with room for returns.
A product can sell for twice its purchase price and still leave little money behind. A useful resale calculation follows the whole order, from buying the item to receiving your earnings. Start with costs you can verify, make uncertain costs visible, and treat a suggested selling price as a decision to review.
Try these numbers in the free profit calculator →
Markup and margin answer different questions
Markup compares the increase in price with the product cost. Margin compares the profit with the selling price. If an item costs $10 and sells for $20, the $10 difference is a 100% markup and a 50% margin before other costs. Calling both figures your profit margin makes it hard to compare products fairly.
For a resale decision, the more useful figure is estimated net profit per order. Subtract the item cost, delivery you pay, packaging, applicable selling and payment fees, and any other costs attached to that order. Keep membership and other ongoing business expenses in a separate monthly calculation so they do not disappear from the picture.
Build a cost list before choosing the price
Record the supplier price for the exact size, color and quantity you intend to sell. A price shown for one option may not apply to every variation. Check the currency and whether a minimum order changes the effective cost of each item.
Delivery has two sides: what the buyer pays you and what fulfillment actually costs. Charging $4 delivery does not create $4 profit when the carrier costs $4. Some payment or marketplace fees also apply to delivery collected from the buyer, so a separate shipping line can still affect your earnings.
Write down what is unknown. An unconfirmed delivery charge, a currency conversion or a missing fee should not become zero just because the calculator needs a number. Use a documented allowance for planning, then replace it with the verified amount when available.
- Product cost for the selected variation and quantity.
- Delivery, packaging and other fulfillment costs you pay.
- Percentage fees, their calculation base, and fixed transaction costs.
- Any transfer cost involved in receiving your earnings.
Work backward from the profit you want
Suppose your item costs $12, delivery costs $3 and packaging costs $1. You want $8 profit. For this example only, assume one fee of 10% of the total buyer payment plus $0.30, with no other costs. The required buyer total is ($16 + $8 + $0.30) ÷ 0.90, which is $27. The percentage fee is $2.70, leaving $8 after the fixed fee and $16 of costs.
These are illustrative fees, not SellerBay or payment-provider rates. The example shows why simply adding 10% to your costs is insufficient: the percentage fee applies to the larger amount the customer pays. Multiple fee bases, minimum fees, tax included in a fee base, and rounding can change the result.
Use a target profit for the outcome you would like and a minimum estimated profit for the lowest price you are willing to accept. Check the assumptions again before discounting. A target helps choose a price; it cannot guarantee that someone will buy or that every final cost will match the estimate.
Compare equivalent products, not just similar titles
A useful comparison matches condition, size or specification, delivery destination and the total price paid by the buyer. A cheaper item with missing parts or costly shipping may not be a close alternative. A higher price may reflect clearer photos, a specific size, faster dispatch or a stronger service offer.
Current asking prices show what other sellers hope to receive. They do not prove a completed sale or demand at that price. If the comparable price sits below your minimum, reconsider the product, costs or offer. Lowering the price until the calculation stops showing a profit does not solve a poor purchase.
Read the SellerBay estimate before publishing
SellerBay lets shop owners choose their retail prices and review estimated earnings. Catalog prices include the platform’s handling and payment allowance, while delivery and applicable tax are shown separately. The shop calculation uses supplier cost and the applicable pricing policy, so do not add the same allowance a second time by hand.
Planning allowances are estimates, not a quoted provider tariff. Verified payment fees and supplier costs determine final earnings. SellerBay can calculate delivery from the product rate or its delivery policy, using the destination and quantity. The buyer reviews a fixed total before payment; differences between estimated and actual costs are reviewed by the team instead of charged to the buyer afterward.
Finally, review actual results across several orders. Returns, damaged items and failed deliveries can consume the profit from successful sales. Keep room for these outcomes in your buying decisions, and compare the money received with your original estimate before repeating a product.