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calcthai.com · Product Profit Margin Calculator
Money & tax
Product Profit Margin Calculator
Include product cost, packaging, seller-paid shipping and sales fees. See per-item profit, margin, markup and total contribution before fixed costs.
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The AI assistant answers only questions about the calculator on this page.
Include product cost, packaging, seller-paid shipping and sales fees. See per-item profit, margin, markup and total contribution before fixed costs.
How it works
Direct cost = product + packaging + seller-paid shipping. Fee = selling price × fee percentage. Per-item contribution = price − direct cost − fee. Margin = contribution / price × 100. Here, markup = after-fee contribution / direct cost × 100.
Example: a THB 250 sale with costs of 100 + 10 + 30 and an 8% fee (THB 20) contributes THB 90 per item: a 36% margin. Selling 100 items contributes THB 9,000 before fixed costs.
Rent, payroll, business taxes and returns are not deducted. Use amounts on a consistent tax basis. Negative values mean a loss; markup is undefined when direct cost is zero.
Frequently asked questions
How do margin and markup differ?
Margin divides contribution by the selling price; markup divides it by direct cost, so the percentages differ.
How many sales cover my rent and overhead?
Use the break-even calculator to include fixed costs over a matching period.
Sources
Method last verified 19 Sep 2026