For small business owners, the dividing line between profitability and failure often comes down to pricing correctly. Gross margin and markup are the two most critical pricing metrics — and the most routinely confused. They use the same inputs but tell completely different stories.
Gross Margin: The Percentage of Revenue You Keep
Gross margin answers: of every dollar I earn, how much stays in my business after paying for the product?
Example: Furniture sold for $500, cost $300 to make. Profit = $200. Margin = (200 ÷ 500) × 100 = 40%.
Markup: The Percentage Added to Cost
Markup looks forward from cost — how much to add to a wholesale price to determine the retail price.
Same example: (200 ÷ 300) × 100 = 66.7%. Same transaction, 40% margin but 66.7% markup.
The Costly Confusion
Because margin divides by the higher selling price and markup divides by the lower cost, markup will always be a larger percentage than margin. A business owner needing a 30% minimum margin who mistakenly applies a 30% markup to a $100 item prices it at $130. Running $130 through a margin calculator reveals only a 23% margin — they just lost 7% of expected profit on every single unit sold.
Break-Even Point
At $12,000 in fixed monthly costs with a 40% gross margin: $12,000 ÷ 0.40 = $30,000 required monthly sales. If you assumed a 40% markup was a 40% margin, your real margin is only ~28.6%, requiring $41,958 in sales — 40% more than expected.
Conclusion
Use markup to set prices. Use a gross margin calculator to evaluate profitability and calculate break-even. Using them interchangeably is a vulnerability your business cannot afford.