How to convert a markup percentage into a margin percentage

Suppliers, friends and spreadsheets often quote a markup, but your costs and ad reports are easier to read as a margin. Converting one to the other takes a single small formula, and you can do it in your head once you have seen it a few times.

The formula

Margin = markup divided by (1 + markup), with the markup written as a decimal.

So a 25 percent markup is 0.25, and margin = 0.25 divided by 1.25 = 0.20, which is 20 percent.

Check it with real rupees

Start with a cost of Rs 100 and a 25 percent markup.

• Price = Rs 100 + Rs 25 = Rs 125
• Profit = Rs 25
• Margin = Rs 25 divided by Rs 125 = 20 percent

The formula and the rupee check agree. This is a useful habit: when you doubt a percentage, put it back into rupees on a cost of Rs 100.

A bigger markup

Now try a 100 percent markup, which means you double the cost.

• Cost Rs 100, price Rs 200, profit Rs 100
• Margin = Rs 100 divided by Rs 200 = 50 percent

By the formula: 1.00 divided by 2.00 = 0.50. A 100 percent markup gives only a 50 percent margin. That surprises many people, because it sounds like you keep everything above cost, yet half of your price is simply your cost.

A few quick pairs

Keep these in mind as reference points:

• 10 percent markup is a 9.1 percent margin (10 divided by 110)
• 25 percent markup is a 20 percent margin
• 50 percent markup is a 33.3 percent margin
• 100 percent markup is a 50 percent margin

Notice that margin always lands lower than markup, and the gap grows as the markup rises. The reason is covered in markup versus margin, explained with one example.

Why this matters for your decisions

Say your supplier sells to you at a standard 30 percent markup over their cost, and then you add 50 percent to that. You may think you are making a lot, yet your margin is 33.3 percent, and out of that you still pay shipping, ads and payment fees. Reading your own profit as margin lets you compare it fairly with those other costs, which are all a share of the selling price. The costs you carry after the sale are covered in gross margin versus net margin.

Going the other way

If you know the margin you want and need the markup to apply on cost, the formula flips. That is covered in if I want a 40 percent margin, what markup should I add.

Next step

Take your three best-selling products and write down the markup you applied to each. Convert each into margin using the formula. If the margins are lower than you thought, you have just found room to adjust your prices before your next restock.