Reckonary / Finance / Keystone pricing
Keystone pricing: doubling the cost keeps half, not all
Double what you paid and charge that — it's the oldest rule in retail, and it feels like you're pocketing 100%. You aren't. Doubling the cost is a 100% markup but a 50% margin, and that 50% still has your rent and markdowns to pay.
What is keystone pricing?
Keystone pricing sets the retail price at double the wholesale cost. Buy a mug for $30, tag it at $60. That's it — one multiplication, no spreadsheet. It caught on because it's fast and predictable: every item carries the same 100% markup, which works out to a 50% gross margin across the whole shop.
The reason it survives is the reason it misleads. Doubling sounds like a 100% gain, and on the cost line it is. But the number that tells you how healthy the sale is — the margin — is measured against the price you charge, not the price you paid. Half of that $60 is still the mug. You keep the other half.
Pick a keystone multiple, then drag in your wholesale cost. The sale price is that cost stacked that many times — the first block is what you paid, the rest is profit. Notice the margin tracks the multiple, not the cost: slide the cost up or down and the margin doesn't budge.
Each block is your $30 cost. Keystone stacks it 2 times into the $60 sale price:
Keystone (2× cost) is a 100% markup but only a 50% margin — the profit is measured against the bigger sale price. Step from keystone (2×) up to triple keystone (4×) and the margin climbs 50% → 75%, not 50% → 100%: past keystone it edges toward 100% without ever getting there, so doubling the multiple never doubles the margin.
If you doubled the cost, why isn't that 100% profit?
Because "double the cost" and "keep 100%" measure profit from two different starting points. Your profit on the $30 mug is $30 either way. Against the $30 you paid, that's a 100% markup. Against the $60 you sold it for, it's a 50% margin. The mug didn't change and neither did your $30 of profit — you just held it up against a different number.
That's the whole trap in one line: markup runs off cost, margin runs off price, and margin is always the smaller of the two on a profitable sale. If the split still feels slippery, the markup vs margin guide walks through it with a conversion table.
What are double and triple keystone?
Plain keystone isn't the only setting. Shops with slower turnover or higher perceived value climb past 2× — and, confusingly, the trade has names for the rungs. Here's how the common ones pencil out.
| Multiple | Markup | Margin | Where you tend to see it |
|---|---|---|---|
| Keystone (2×) | 100% | 50% | General retail baseline |
| Double keystone (3×) | 200% | 66.7% | Boutique apparel, gifts, home decor |
| Triple keystone (4×) | 300% | 75% | Independent jewelry |
Watch the margin column, because it's the surprise. You lifted the multiple from 2× to 4× — you doubled it — yet the margin only went from 50% to 75%. It didn't double to 100%. Margin creeps toward 100% and never reaches it, since your profit can't be worth more than the entire price. So each extra turn of the multiple buys you less margin than the one before.
One honest caveat: the labels wobble. Much of the trade calls 3× cost "double keystone," but you'll find shops that mean 4× by it. The multiple is exact; the nickname isn't. Say "three times cost" and nobody has to guess.
Does a 50% margin mean you pocket half?
No — and this is where keystone flatters the beginner. A 50% margin is a gross margin: what's left after you've paid for the goods, but before the shop's own bills. Rent, wages, card processing, and the markdowns you take to clear stock all come out of that same 50%.
Markdowns bite hardest, because they cut the price your margin is measured against. Take that keystoned $60 mug and see what each discount does to it:
| Markdown | Sells for | Profit | Margin now |
|---|---|---|---|
| None | $60 | $30 | 50% |
| 10% off | $54 | $24 | 44.4% |
| 20% off | $48 | $18 | 37.5% |
| 30% off | $42 | $12 | 28.6% |
| 40% off | $36 | $6 | 16.7% |
| 50% off | $30 | $0 | 0% |
A 30% markdown doesn't cost you 30% of your margin — it wipes out more than 40% of it, dropping you from 50% to 28.6%. And the classic "half off" sign on a keystoned item sells it for exactly what you paid. On the mug itself you break even; once the shop's rent and staff are counted, it's a loss. That's why a 50% margin is a starting cushion, not take-home pay.
When does keystone pricing work — and when does it break down?
Keystone earns its keep as a default for goods with no obvious street price, where a clean 2× lands in a believable range and does the pricing thinking for you. For a shelf of $12–$60 gifts, it's genuinely useful.
It breaks in two directions. On commodity, high-turnover goods — groceries, phone chargers, anything shoppers can price in their sleep — doubling overshoots the market and the item just sits. On slow, premium, markdown-prone goods, 2× is too thin to survive a season of discounts, which is why boutiques and jewelers reach past plain keystone to double and triple it. The rule is a fine starting point; it's a poor finishing one.
Try your own cost and multiple:
Open the markup calculator →The same percentage slipperiness catches shoppers from the other side of the counter. For the buyer's version, see why 20% off then 10% off isn't 30% off.
Frequently asked questions
Is keystone pricing the same as a 100% markup?
Yes. Keystone means you double the cost, and doubling is adding the whole cost back on top of itself — a 100% markup. A $30 item becomes $60. That same sale is a 50% margin, because the $30 of profit is half of the $60 you charged.
Why is a 100% markup only a 50% margin?
Because the two percentages divide the profit by different numbers. Markup measures the $30 profit against the $30 cost, which is 100%. Margin measures the same $30 against the $60 price, which is 50%. The gap trips up a lot of shopkeepers — the longer version is in our markup vs margin guide.
What is double keystone pricing?
It usually means pricing at three times cost rather than two — a 200% markup and a 66.7% margin. Boutiques and gift shops lean on it. The labels aren't standardized, though: some in the trade use double keystone for 3x cost, others reserve it for 4x, so it's safer to state the multiple you mean.
Is a 50% gross margin the same as keeping half the money?
No. A 50% margin is gross margin — what's left after the goods are paid for, but before rent, staff, card fees, and end-of-season markdowns. Those come out of the same 50%, so the profit you actually take home is a good deal smaller.
When should you not use keystone pricing?
Skip it where doubling overshoots the market price — commodity, high-turnover goods like groceries, where shoppers know the going rate. And it's often too thin for slow-moving or heavily discounted goods, which is why jewelers and boutiques price at three or four times cost instead.
Last reviewed July 2026. This guide is for education, not financial advice.