Here is a mistake that quietly bleeds one-person businesses: you decide you want a 50% profit, you add 50% to your costs, and you congratulate yourself on a healthy price. You don’t have a 50% profit. You have a 33% one. The missing 17 points are the difference between markup and margin, two words people use interchangeably even though they measure different things.
This article untangles them with plain definitions, a handful of worked examples (arithmetic checked), and a cheat sheet you can tape to your monitor.
The one-sentence difference
- Markup is profit as a percentage of what the item cost you.
- Margin is profit as a percentage of what you charge.
Same dollars of profit, different denominators. Because the price is always bigger than the cost, the margin percentage is always smaller than the markup percentage (unless profit is zero, in which case you have bigger problems).
The formulas
Let profit = price − cost. Then:
- Markup % = profit ÷ cost × 100
- Margin % = profit ÷ price × 100
- Price from a markup = cost × (1 + markup)
- Price from a target margin = cost ÷ (1 − margin)
That last one is the one people don’t know, and it is the one that saves you money. Write it down.
Worked example 1: the same sale, two percentages
You buy a product for $60 and sell it for $100.
- Profit: $100 − $60 = $40
- Markup: $40 ÷ $60 = 66.7%
- Margin: $40 ÷ $100 = 40%
One sale. A 66.7% markup and a 40% margin. Both are correct. They just answer different questions: “How much did I add on top of my cost?” versus “How much of each sales dollar do I keep before overhead?”
Worked example 2: the 50% trap
Say you resell a product that costs you $40, and you want a 50% margin, meaning half of every sales dollar should be gross profit.
The wrong way: add 50% to cost. $40 × 1.50 = $60. Profit is $20. Margin is $20 ÷ $60 = 33.3%. Not even close.
The right way: divide cost by (1 − 0.50). $40 ÷ 0.50 = $80. Profit is $40. Margin is $40 ÷ $80 = 50%. To get there you needed a 100% markup, which feels outrageous until you remember what it means.
Worked example 3: pricing your own time
This works for services too. Say your fully loaded cost of delivering an hour of work (your own pay target plus the tools, software and insurance you allocate to it) comes to $40. You want a 35% gross margin on billable time.
- Price: $40 ÷ (1 − 0.35) = $40 ÷ 0.65 = $61.54 per hour
- Check: 35% of $61.54 is $21.54, and $61.54 − $21.54 = $40.00. It works.
- The equivalent markup: $21.54 ÷ $40 = 53.8%
Notice the trap if you’d just added 35% to cost: $40 × 1.35 = $54. That’s a margin of only 25.9%. On a full-time schedule that gap adds up to real money.
Cheat sheet: margin vs. markup
To convert, use these two shortcuts: markup = margin ÷ (1 − margin) and margin = markup ÷ (1 + markup). Some common pairs:
- 20% margin = 25% markup
- 25% margin = 33.3% markup
- 30% margin = 42.9% markup
- 40% margin = 66.7% markup
- 50% margin = 100% markup
- 60% margin = 150% markup
If anyone quotes you “a 30% margin” or “a 30% markup” in a negotiation, a contract, or a supplier deal, ask which one they mean. The two differ by a lot more than you’d think.
Why margin is the number to manage
Margin has two big advantages over markup.
1. It fits the financial statements
Your income statement is built on revenue. Gross margin (revenue minus cost of goods sold, divided by revenue) is the line that tells you what’s left to pay for rent, software, marketing, taxes and you. If your yearly revenue is $200,000 and your gross margin is 40%, gross profit is $80,000 and cost of goods sold is $120,000. That’s a markup of 66.7% on those costs, but you can’t run a budget off the markup. You run it off the dollars that are left. If statements make your eyes glaze, our guide to financial statements as business tools is a gentle start.
2. It shows what a discount really costs
Take that $100 item with the $60 cost (40% margin). Knock 10% off for a “good customer”:
- New price: $90. Profit: $90 − $60 = $30.
- New margin: $30 ÷ $90 = 33.3%.
- Profit per sale fell from $40 to $30, a 25% drop for a 10% discount.
- To make up the lost profit, you must sell $40 ÷ $30 = 1.33 times as many units, a third more volume, just to stand still.
That’s the math behind our argument that cutting prices is like cutting your throat. Before you say yes to a discount, run this calculation. And when a customer says “I can’t afford it,” have your margin number in your head before you answer the price objection.
Gross margin is not your take-home
A 50% margin does not mean you pocket half of every sale. Margin as discussed here is gross: it ignores overhead, payment-processing fees, advertising, your accountant, and taxes. Many owners set a margin target, forget about the fees, and then wonder why a “50% margin” business barely pays them.
Two habits help:
- Build fees into cost. If a payment processor or marketplace takes a percentage of each sale, that percentage comes off the price, not the cost. Price math with a percentage-of-revenue fee gets slightly trickier: if you want to keep a 40% margin after a 3% fee, you need a margin of 43% before it (because the fee is 3% of price, and everything is measured against the same price).
- Know your break-even. Add up your monthly fixed costs, divide by your gross margin percentage, and you get the revenue you need just to break even. With $6,000 of monthly overhead and a 40% margin, that’s $6,000 ÷ 0.40 = $15,000 of monthly sales. At a 30% margin, the same overhead needs $20,000. Margin points are worth fighting for.
A tiny spreadsheet that does the work
You don’t need accounting software for this. In any spreadsheet, put your cost in A2 and your target margin (as a decimal, such as 0.40) in B2. Then in C2 enter =A2/(1-B2) for the price. In D2, enter =(C2-A2)/A2 to see the markup it implies. Format B2 and D2 as percentages and you have a pricing calculator you can reuse on every quote. Add a row for each product or service and you can spot the ones dragging your average down.
The takeaway
- Markup is profit divided by cost. Margin is profit divided by price. Never mix them up in a conversation, a contract, or a spreadsheet.
- To hit a target margin, divide cost by (1 − margin). Don’t multiply by (1 + margin).
- Think in margin when you set prices, evaluate discounts, and plan your overhead. Think in markup only when a supplier or retailer speaks it.
- Remember that gross margin is before overhead. Check your price against your break-even, not just your percentage.
The math takes about ten minutes to learn and pays for itself the first time you decline a discount you can’t afford.