E-Commerce Profit &
Margin Calculator Guide
Automatically factor in commissions for platforms like Coupang or Naver SmartStore. Easily simulate logistics (shipping, packing) and find your break-even pricing.
Open Tool NowHow to Use — Step by Step
Enter Cost & Price
Input the product acquisition cost and the final selling price. The calculator will recalculate all values instantly as you edit.
Select Platform Preset
Choose the marketplace to calculate commissions: Coupang (10.8%), SmartStore (5.85%), 11Street (12%), Interpark (10%), or Direct Sale (0%). You can also specify custom rates.
Input Fulfillment Costs
Add packing material prices, outbound shipping fees, and marketing cost allocations per unit to evaluate your true net profits.
Verify Net Margin & Break-Even
Review the final margin card highlighted in Green (profitable) or Red (deficit). Use the Break-Even Price metric to set your minimum discount limits.
💡 Pro Seller Tips
- Safety Margin: It is recommended to secure at least a 20%+ margin rate to absorb refund shipping costs and unexpected promotional discount fees.
- Fulfillment Surcharges: Even if customers pay for shipping, marketplaces may apply transaction commission surcharges on logistics fees.
- Platform Selection: Compare platform margins to decide which channel (e.g., Naver SmartStore with lower fees vs. Coupang with higher traffic) yields better returns.