A wholesale price can look attractive and still leave too little room after an item is listed, packed, and sold. For K-Beauty resellers, the useful question is not only “What did I pay for this product?” It is “What does one sellable unit cost me, and what remains after this specific order is fulfilled on this channel?”
A simple per-unit cost sheet helps answer that before you commit to a price or a larger order. It is useful for a Shopify store, TikTok Shop, Whatnot, or a mix of channels. The figures in the example below are hypothetical; platform fees, shipping costs, and available inventory vary and should be verified for the order and seller account you are using.
Start with the cost of inventory you can actually sell
For a single-SKU order, divide the purchase cost by the quantity you expect to sell. For mixed K-Beauty inventory, first calculate the cost of the lot as a whole, then choose a consistent way to assign that cost to products. Include inbound freight and other direct costs required to get the lot into your selling operation.
A basic lot-level calculation is:
Landed cost per sellable unit = (inventory purchase cost + inbound freight and direct receiving costs) ÷ sellable units
Suppose a hypothetical mixed lot costs $480, inbound freight is $80, and inspection finds 36 sellable units out of 40 received. The lot has $560 in direct cost. Dividing $560 by 36 gives an average landed cost of about $15.56 per sellable unit. The four units that cannot be sold do not disappear from the purchase cost; their cost is absorbed by the units that remain sellable unless the supplier provides a credit.
This average is a planning shortcut, not proof that every SKU has the same value. If products differ significantly in size, category, or likely resale value, use a reasonable allocation method, such as relative wholesale values when you have them. Write down the method and use it consistently. Keep exact product and variation records separate so a low-cost item does not hide an expensive one.
Add the costs that happen on each sale
The inventory cost is only one part of a customer order. For each channel, estimate the variable costs you expect to incur when one item sells:
- Marketplace or payment fees: use the fee breakdown shown for your account and order type.
- Outbound shipping support: include any amount you pay toward shipping or a discount you offer. If the customer pays shipping, record the actual amount charged and the actual label cost separately.
- Packaging and pick-and-pack: include mailers, cartons, protective material, labels, and a reasonable labor cost if you track it.
- Promotions and creator costs: include discounts, affiliate commissions, or paid promotion attributable to the sale.
- Expected returns or damage allowance: use your own records rather than assuming every order completes without an adjustment.
Do not count a cost twice. For example, if your platform order statement already includes a promotion deduction, do not subtract the same promotion again in your worksheet. Separate one-time overhead—such as rent or a monthly software subscription—from costs that rise with each order.
Check the current fee details in each seller account
Do not use a remembered fee rate or a rate copied from an old blog post. Whatnot’s current seller-fee guidance explains that commissions can depend on category, market, and sales tier, and that payment processing is separate. It also directs sellers to the order receipt in Seller Hub for the exact rate and fee breakdown. Review the receipt for a comparable recent order before setting a price.
TikTok Shop fees and eligibility can depend on the product category, order, and programs active in your account. Review the current fee information in Seller Center and the official TikTok Shop referral-fee guidance. For beauty inventory, check the current Beauty and Personal Care Products Requirements as well; category qualification or product restrictions can affect whether an item is eligible for your intended listing.
Whatnot’s seller statement guide lists commissions, payment processing, seller-paid shipping, promotion spend, refunds, and other adjustments among the costs sellers may see. Use order-level details to build a product estimate and reconcile it against statements over time. A payout is not the same as product profit.
Calculate what remains from a sale
Once you have a landed unit cost and sale-specific costs, estimate contribution per item:
Contribution per sale = item revenue − landed unit cost − marketplace and payment fees − seller-paid shipping − packaging and fulfillment − discounts or other sale costs
Contribution is the amount left to help cover fixed business costs and profit. It is not the same as net profit because it may not include rent, payroll, insurance, taxes, or every operating expense.
For an illustration, say a K-Beauty item sells for $28. Use the hypothetical $15.56 landed cost above, a hypothetical $3 in platform and payment fees, $1.25 for packaging and fulfillment, and $2 of seller-funded shipping support. The estimated contribution is $6.19 before fixed overhead, taxes, and any other costs. The $3 fee is only an example; replace it with the amount shown for the specific channel and order.
Shopify’s product pricing guide also recommends understanding costs before setting a price and reviewing market context. A cost sheet gives you a floor for decision-making; it does not establish what customers will pay. Compare similar products and offers, while keeping condition, size, packaging, and listing details genuinely comparable.
Use a price floor, then test the offer
A price floor is the lowest price that meets your chosen contribution goal under stated assumptions. If you model platform fees as a percentage of the item price, a simplified estimate is:
Estimated price floor = (landed unit cost + other per-sale costs + desired contribution) ÷ (1 − estimated percentage fee)
This formula is a planning aid only. Some fee calculations use a different transaction base, add a fixed charge, or change with shipping, tax, category, seller tier, or promotional status. Use the order fee estimate or current seller-account details whenever possible. Recalculate when the offer includes a coupon, free shipping, bundle discount, or paid promotion.
For a bundle, add the landed cost of all included products and the costs of the combined shipment. Then allocate the bundle’s fees and revenue in a consistent way if you want to compare performance by SKU. A bundle that looks attractive at the order level may still be hiding an item that is costly to pick or difficult to replace.
Compare channels with the same assumptions
TikTok Shop and Whatnot can bring different fee structures, shipping arrangements, promotion choices, and order patterns. Compare the same SKU using a separate worksheet row for each channel. Keep the product cost constant, then change only the costs that actually differ: fees, customer shipping collected, seller shipping support, promotion, packaging, or labor.
For each channel, record:
- Observed sale price and any discount
- Actual fee amount from the order detail
- Shipping charged to the customer and label cost
- Packaging, fulfillment, promotion, and refund adjustments
- Estimated contribution and the date you reviewed it
Use completed orders and actual statements to replace estimates as your records grow. If one product sells for less during a live show, note whether that price included a bundle, auction result, giveaway, or promotion. Comparing unlike offers can lead you to the wrong conclusion about a channel.
Use the worksheet before buying more
Before placing a wholesale order, estimate the cost range with the information you can verify: purchase amount, sellable quantity, inbound freight, lot mix, and any handling costs. Then check whether your expected offer can cover the per-order costs on the channel where you intend to sell. If an essential number is unknown, mark it as an assumption and ask the supplier or platform for the missing detail instead of treating it as a fact.
Flexible quantities or a mixed lot may help a reseller test products without concentrating the entire purchase in one SKU. They do not guarantee a lower unit cost or a profitable sale. A small order can still carry substantial freight or labor per item, while a larger order can tie up more cash and storage space. Compare the full lot economics and the amount of work required to sell through it.
For K-Beauty sellers who want to compare current product mix and order options, review the REMEX Mixed Korean Cosmetics Small Lot listing. Product mix, price, availability, shipping, and terms can change. Confirm the current details for the specific lot before making a decision. You can also contact the REMEX team with questions about current inventory, quantity options, location, and order terms.
Frequently asked questions
What is the difference between markup and contribution?
Markup compares a selling price with product cost. Contribution subtracts the variable costs tied to the sale as well, including channel fees, fulfillment, and shipping support. Contribution gives a more complete per-order view, but it still does not equal final business profit.
How should I calculate unit cost for a mixed cosmetics lot?
For a quick estimate, divide the lot’s purchase and direct inbound costs by the sellable unit count. If the SKUs have different values, allocate the lot cost with a consistent method and keep each product variation separate in your records.
Should I use the same price on TikTok Shop and Whatnot?
Not automatically. The same item can have different fees, shipping arrangements, discounts, and fulfillment costs on each channel. Recalculate contribution using current order details for each channel before choosing a price.
How often should I update my fee assumptions?
Check current seller guidance when you start listing, when your account or program changes, and whenever an order receipt differs from your estimate. Reconcile estimates with completed orders and seller statements on a regular schedule.
