Marketplace Profit After Entered Costs
Inspect money left from a sale after all entered costs. The platform fee is a single percentage of the selling price, so the worksheet cannot reproduce every contract’s settlement structure.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Enter KRW selling price, purchase cost, shipping and advertising, plus the fee percentage. Include seller-funded delivery but avoid counting a cost again if it is already included in product cost.
Results and examples
Profit subtracts all entered costs from price. Margin uses selling price as its denominator, not cost, so it differs from markup even when the underlying profit amount is identical.
Worked example
KRW 20,000 price less 10,000 cost, 2,000 fees, 3,000 shipping and 1,000 ads leaves 4,000 profit and 20% margin.
Limitations
- VAT settlement, returns and coupon cost sharing require separate treatment.
- The default fee is not retrieved from your seller agreement.
Fields
| Field | Guidance and constraints |
|---|---|
| Selling price (KRW) | Check the unit and format displayed beside this field. |
| Cost / purchase price (KRW) | Check the unit and format displayed beside this field. |
| Platform fee (%) | Check the unit and format displayed beside this field. |
| Shipping & packing (KRW) | Check the unit and format displayed beside this field. |
| Ads & other (KRW) | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Is a 20% margin based on cost?
No. This margin is 20% of the selling price.
Does the percentage also apply to shipping?
The engine applies it to price only; adjust for a different contractual base.
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