Profit & landed-cost calculator
Per-unit profit for Amazon US, Shopify and WooCommerce. All math runs in your browser; nothing is sent to a server. Fees last verified 2026-10-13 — see sources below.
Per-unit result
The URL updates as you type, so you can bookmark or share a scenario.
Fee sources
| Provider | Source | Last verified | Notes |
|---|---|---|---|
| amazon | https://sell.amazon.com/pricing | 2026-10-13 | US store referral fees and selling plans. FBA fulfillment fees depend on size/weight tier and are not modeled; enter your FBA fee from Amazon's Revenue Calculator. |
| shopify | https://www.shopify.com/pricing | 2026-10-13 | US pricing; yearly-billing monthly price shown, monthly billing is higher. Online standard card rates with Shopify Payments. |
| stripe | https://stripe.com/us/pricing | 2026-10-13 | US standard pricing for domestic cards. |
| paypal | https://www.paypal.com/us/business/paypal-business-fees | 2026-10-13 | US commercial transaction rates (page last updated Oct 1, 2026). International transactions add 1.50%. |
| woocommerce | https://wordpress.org/plugins/woocommerce/ | 2026-10-13 | Core plugin is free. Hosting, theme, extensions are separate. WooPayments rates were NOT verified; enter your gateway rate. |
Fees change. Always confirm against your own account before making pricing decisions.
FAQ
What is landed cost?
Landed cost is the total cost of getting one unit to your warehouse or customer: product cost, freight and shipping, import duty, and other import charges such as brokerage.
How is break-even price calculated?
MarginSum searches for the lowest selling price at which net profit per unit reaches zero, recomputing percentage-based platform and payment fees at each price.
Why do I need to enter my FBA fee?
Amazon FBA fulfillment fees depend on size tier, weight and season. Use Amazon's Revenue Calculator or your Seller Central fee preview and enter the per-unit figure.
Does sales tax reduce my profit?
US sales tax is collected on top of your price and remitted, so it does not change profit in this model. EU/UK VAT is usually included in the shelf price, so choose "VAT included in price" to remove it from revenue.