Profit margin
Encyclopedia
Profit margin, net margin, net profit margin or net profit ratio all refer to a measure of profitability
Profit (accounting)
In accounting, profit can be considered to be the difference between the purchase price and the costs of bringing to market whatever it is that is accounted as an enterprise in terms of the component costs of delivered goods and/or services and any operating or other expenses.-Definition:There are...

. It is calculated by finding the net profit
Net profit
Net profit or net revenue is a measure of the profitability of a venture after accounting for all costs. In a survey of nearly 200 senior marketing managers, 91 percent responded that they found the "net profit" metric very useful...

 as a percentage of the revenue
Revenue
In business, revenue is income that a company receives from its normal business activities, usually from the sale of goods and services to customers. In many countries, such as the United Kingdom, revenue is referred to as turnover....

.

Net profit Margin = (Net Income / Revenue) x100

The profit margin is mostly used for internal comparison. It is difficult to accurately compare the net profit ratio for different entities. Individual businesses' operating and financing arrangements vary so much that different entities are bound to have different levels of expenditure, so that comparison of one with another can have little meaning. A low profit margin indicates a low margin of safety: higher risk that a decline in sales will erase profits and result in a net loss, or a negative margin.

Profit margin is an indicator of a company's pricing strategies and how well it controls costs. Differences in competitive strategy and product mix cause the profit margin to vary among different companies.

Confusion

Profit margin is frequently confused with markup
Markup (business)
Markup is the difference between the cost of a good or service and its selling price. A markup is added on to the total cost incurred by the producer of a good or service in order to create a profit. The total cost reflects the total amount of both fixed and variable expenses to produce and...

. It's not uncommon for entrepreneurs to erroneously claim profit margins over 100%. Most likely these entrepreneurs are referring to the markup on a product as a percentage of product cost.
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