Enter the details you know. Optional advanced fields are kept separate so the main calculation stays easy to use.
How to use this calculator
- Enter a consistent cost basis.
- Set the markup percentage you usually use and the gross margin you want to achieve.
- Compare the two prices and note that this simple conversion does not automatically account for selling fees unless you include them in the cost basis.
How the estimate works
Markup formula: price = cost × (1 + markup% ÷ 100). Gross margin formula: margin% = (price − cost) ÷ price × 100.
For a target margin, price = cost ÷ (1 − margin% ÷ 100). The target margin must be below 100%, because a finite selling price cannot produce a 100% margin on a positive cost.
Frequently asked questions
Why is a 50% markup not a 50% margin?A 50% markup on cost produces profit equal to one-third of the final selling price, so the margin is 33.3%.
Can margin be higher than 100%?Not for a positive cost and finite selling price under the standard gross-margin definition.
Should I include selling fees in cost?For a target net margin after commissions, include a realistic allowance for the selling costs or use a dedicated pricing calculator.
What if item cost is zero?The price formula returns zero and markup-on-cost is not meaningful because it divides by zero.
Does this determine antique market value?No. It converts financial pricing percentages. Comparable sales and item condition still determine what buyers may pay.