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Keystone Pricing Calculator

Enter the unit cost to get the keystone retail price, profit and margin.

How it is calculated

Enter the unit cost you pay for one item, in US dollars. The tool applies the keystone rule: price = cost × 2, profit = price − cost, which always equals the cost. The margin shown is a fixed 50.00%, because doubling the cost always leaves half of the selling price as gross profit, whatever the cost is.

Margin here means margin on the selling price: profit / price. Measured against cost, the same sale is a 100% markup. A negative cost gives no result, and a cost of zero returns zeros. The tool has no field for a different multiplier, shipping, tax or discounts. For a different target margin, use price = cost / (1 − margin).

Worked example

A shop buys a product for $24.50. Keystone price: 24.50 × 2 = $49.00. Profit per unit: 49.00 − 24.50 = $24.50. Margin on price: 24.50 / 49.00 = 50.00%. If the shop sells ten units, the gross profit is $245.00 before rent, wages and other costs.

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Common mistakes

  • Confusing margin with markup. Doubling the cost is a 100% markup but only a 50% margin, and quoting one as the other misstates profit.
  • Using landed cost incorrectly. If freight, duty or packaging are left out of the unit cost, the true margin is below 50%.
  • Treating the result as net profit. It is gross profit, and rent, staff, card fees and returns still come out of it.
  • Applying keystone to every category. Products with thin margins, such as electronics or groceries, often cannot be sold at double cost.
  • Entering the intended selling price instead of cost. The tool doubles whatever you type, so the answer would be twice your target price.

About this calculator

Keystone pricing is the traditional retail rule of setting the sell price at exactly double the wholesale or unit cost (retail = cost × 2), which works out to a clean 50% gross margin on the sale price. It originated in independent retail — jewellery, apparel, furniture, hardware — as a fast rule of thumb that covers overhead, shrinkage, markdowns and profit without a spreadsheet.

Doubling the cost gives the keystone retail price, along with the profit per unit and the margin that doubling leaves, so a thin-margin line such as electronics may need a higher multiplier.

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Comments (1)

  • Editorial team

    You can use the rule backwards as a ceiling on what to pay. If shoppers will not go above 49.00 for a product, keystone only works when your unit cost is 24.50 or less, since the price is exactly twice the cost. When the supplier quote is higher, the choice is a thinner margin or a different product. Which product category do you price this way?

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