Retail Markup and Keystone Pricing: How to Set Your Price

How markup works

Markup is the amount added to cost to reach a selling price, stated as a percentage of the cost. The formula is markup % = (price − cost) ÷ cost × 100. Rearranged to set a price, it is price = cost × (1 + markup ÷ 100). Buy a shirt for $20 and apply a 60% markup: 20 × 1.6 = $32. The extra $12 has to cover rent, staff, marketing and profit — markup is not pure profit.

Different categories carry very different markups. Groceries often sit at 10–15% because they turn over fast; clothing and accessories may run 100% or more; restaurant drinks can exceed 300%. The right markup balances what the market will bear against the costs you must recover and the volume you expect to sell.

Keystone pricing: the double-the-cost rule

Keystone pricing is the retail shortcut of setting the price at exactly twice the cost — a 100% markup. A product costing $20 is priced at $40. It is popular because it is fast, easy to apply across a whole catalogue, and usually leaves enough gross profit to cover typical retail overheads. Many boutiques and gift shops price this way by default.

But keystone is a starting point, not a law. Low-cost, high-volume items may need more than double to cover handling; premium or slow-moving goods may bear far more than 2×. And a 100% markup is only a 50% margin, so after rent, wages and shrinkage, the actual profit is much thinner than doubling the price suggests. Treat keystone as a default to adjust, not a guarantee of profit.

Markup versus margin — don't confuse them

Markup and margin describe the same profit from different angles. Markup is profit as a percentage of cost; margin is profit as a percentage of price. For a $20 item sold at $40, the $20 profit is a 100% markup (20 ÷ 20) but a 50% margin (20 ÷ 40). Because the price is always larger than the cost, the margin percentage is always lower than the markup percentage.

The confusion is costly. If you believe you need a 40% margin and simply add 40% to cost, you actually earn only a 28.6% margin — well short of your target. To convert cleanly, use margin = markup ÷ (1 + markup), and markup = margin ÷ (1 − margin). Knowing which one your figures refer to keeps prices from quietly falling below the profit you planned.

Frequently asked questions

What is the markup formula?

Markup % = (price − cost) ÷ cost × 100. To set a price from a markup, use price = cost × (1 + markup ÷ 100).

Why is keystone pricing a 100% markup?

Keystone means doubling the cost, and doubling adds an amount equal to the cost itself. Adding 100% of the cost is by definition a 100% markup, giving a 50% margin.

How do I convert markup to margin?

Use margin = markup ÷ (1 + markup), with both as decimals. A 50% markup (0.5) gives 0.5 ÷ 1.5 = 33.3% margin. To go the other way, markup = margin ÷ (1 − margin).

Is keystone pricing right for every product?

No. It is a handy default but should be adjusted: raise it for premium or slow-selling goods that can bear more, and rethink it for high-volume items where 2× may not cover handling and overhead.