Margin Bench / Field guide
Margin vs. markup: choose the right pricing base
Compare margin and markup with a cost-of-40 example, convert between them, and see how discounts change what a sale leaves behind.
Margin and markup use different denominators
Markup expresses the difference between price and cost as a percentage of cost. Margin expresses that difference as a percentage of revenue. For a seller choosing prices, the distinction matters because the same percentage produces different prices depending on which base you use. A 50% markup is not a 50% margin.
Before comparing either measure, define the cost being subtracted. Landed product cost, all variable selling costs, and all business expenses are different scopes. A price-minus-product-cost margin is not automatically net profit margin. The net profit margin calculator only gives a genuinely net measure when your supplied total includes all expenses in the chosen accounting scope.
Worked example: a cost of 40 and price of 60
Suppose one unit costs 40 and sells for 60 after discounts, with pass-through tax excluded. These are illustrative currency amounts, not recommended prices. The difference is 20. Markup is (60 - 40) / 40 x 100 = 50%. Margin on that same cost basis is (60 - 40) / 60 x 100 = 33.33%, rounded for display.
The numerator has not changed. The 20 is half of the cost but only one third of the selling price. Calling it a 50% margin would imply that half the sale is retained, which this example does not support. Use the markup calculator with cost 40 and price 60 to reproduce the first result.
Now include 5 of shipping and 3 of transaction fees. Variable costs become 48, leaving 12 before any excluded advertising or overhead. Contribution margin is (60 - 48) / 60 x 100 = 20%. That is a useful order-level view, but it is still not net profit if rent, salaries, interest, or other relevant expenses remain unpaid.
Compare the questions, not just the percentages
| Measure | Calculation | What it tells you |
|---|---|---|
| Markup | 20 / 40 = 50% | Increase over the supplied unit cost. |
| Margin on product cost | 20 / 60 = 33.33% | Revenue share after product cost only. |
| Contribution margin | 12 / 60 = 20% | Revenue share after 48 of variable costs. |
| Net profit margin | Not established here | Requires the complete expense total, not just 48. |
Converting a target into a price
With cost 40, a 25% markup gives 40 x (1 + 0.25) = 50. A 25% margin on the same cost basis instead requires 40 / (1 - 0.25) = 53.33 approximately. The second price is higher because the retained amount must be one quarter of the final price rather than one quarter of cost.
Using decimal fractions, margin equals markup divided by one plus markup; markup equals margin divided by one minus margin. For example, a 0.50 markup converts to 0.50 / 1.50, or about 0.3333 margin. These conversions assume the same positive cost basis and positive price. A 100% margin cannot be achieved with a positive cost and a finite price.
A rounded price can slightly miss a precise target. If the target is a hard commercial requirement, recalculate using the actual price you will charge and your billing system's rounding rules. Do not assume a displayed two-decimal answer is exact decimal accounting.
Check the discounted sale before deciding
A 10% discount takes the 60 price down to 54. If the earlier 48 variable-cost total stays unchanged for this scenario, contribution falls from 12 to 6, and contribution margin becomes 6 / 54 x 100 = 11.11%. A 10% price reduction has halved contribution in this example, rather than reducing it by only 10%.
In practice, percentage-based fees may also fall with price, so recompute the actual fee amount rather than freezing every cost by habit. Shipping, packaging, returns, and volume tiers can behave differently. The example isolates a constant-cost scenario; it is not a blanket claim about every promotion.
- Which costs does your pricing basis include, and which still need funding?
- Is the percentage a markup on cost or a margin on the realized selling price?
- Would discounts, returns, or a more expensive delivery region remove the contribution?
- Can the expected volume cover fixed costs without assuming an unchanged product mix?
Use markup to describe a cost-plus rule, contribution margin to inspect variable economics, and net margin to assess a complete expense total. Start with the actual selling price and clearly named costs; a percentage is only interpretable after those definitions are settled.
Examples are illustrative and use one consistent currency, not market data or personalized financial advice. Displayed figures are rounded. See methodology and numeric limits before using your own inputs.