Enter your real numbers - sell price, product and shipping cost, ad cost per sale, payment fees, refunds and monthly fixed costs. You get profit per order, net margin, markup on landed cost, break-even orders per month, and the minimum ROAS your product needs.
Skip — margin too thin
Most stores die because the ad cost per sale was never in the spreadsheet. A $39 product with $14 landed cost looks like a 64% margin - until a $20 CPA turns it into pocket change. Model it before you spend.
Profit per order = sell price − product cost − shipping − ad cost per sale − payment fees − refund allowance. Everything else (margin, break-even, ROAS) is derived from that one number.
15–20% net margin per order after ads and fees is workable. Below 10% one bad ad week wipes the month out.
Break-even ROAS = sell price ÷ gross profit before ads. If the calculator says 2.4×, every dollar of ad spend must return $2.40 just to break even.
Yes - free, no account, runs in your browser. If you want the reasoning behind each input, the first three lessons are free too.