Define the cost you are using
Markup and margin calculations start with a cost figure, but that figure needs a definition. For this example, imagine a fictional job with $800 of assigned labor cost, $250 of materials, and $150 of other assigned costs. The example cost is therefore $1,200. These amounts are invented to demonstrate arithmetic, not local market prices or recommended allowances. Your own worksheet should state which costs are included so that two apparently similar percentages are not built on different assumptions.
Calculate a markup on cost
A 25% markup on the example cost adds $1,200 × 0.25 = $300. The resulting selling price is $1,500. Markup answers a specific question: how much was added relative to the stated cost? In this case, $300 divided by $1,200 equals 25%. That calculation says nothing by itself about whether all of your business expenses were included. It is simply the relationship between the chosen cost basis and the amount added to it.
Calculate the margin on selling price
At a $1,500 selling price and $1,200 stated cost, the difference is still $300. But the margin percentage uses the selling price as its denominator: $300 ÷ $1,500 = 20%. A 25% markup therefore produces a 20% margin in this example. Mixing up those denominators can make a pricing worksheet look more generous than it is. Label each percentage explicitly instead of using a vague field called profit percent that could mean either calculation.
Work backward from a target margin
If the objective were a 25% margin on that same stated cost basis, the arithmetic would be $1,200 ÷ (1 − 0.25) = $1,600. The difference is $400, and $400 ÷ $1,600 = 25%. This is a mathematical illustration, not advice to use a particular margin. It is also not a claim about net profit: expenses outside the chosen cost basis would still matter. First settle the definitions, then decide which calculation matches your own pricing process.
| Calculation | 25% markup example | 25% margin example |
|---|---|---|
| Stated cost | $1,200 | $1,200 |
| Selling price | $1,500 | $1,600 |
| Difference | $300 | $400 |
| Margin on selling price | 20% | 25% |
Check what a discount changes
Suppose the $1,600 example price is reduced by $100 without reducing the stated $1,200 cost. The difference falls from $400 to $300, and the margin becomes $300 ÷ $1,500 = 20%. A small-looking change to the selling price can therefore change the percentage meaningfully. When considering an adjustment, recalculate rather than subtracting the same number of percentage points. If the scope is reduced too, revise the cost inputs before comparing the options.
Keep the customer document simple
Your internal cost model does not have to become the customer-facing estimate. The customer needs a clear scope, quantities where useful, included work, and a readable total. Internally, keep a small check showing cost basis, selling price, difference, markup percentage, and margin percentage. Recalculate it whenever quantities or scope change. A consistent worksheet gives you a better basis for decisions than trying to infer the economics from the final PDF after the estimate has already been shared.