It's important to emphasize that you need to account for all revenue, including operating revenue and non-operating revenue, such as investment income. Similarly, be sure to account for all expenses, even interest and taxes, which are left out of some other profitability metrics. You can find the net income listed separately on the income statement, but it's important to know where it comes from.
Then, divide the net income by the total revenue, and multiply by 100 in order to express the result as a percentage. This will give you the company's total margin ratio.
A positive percentage represents a profitable business, and a negative percentage tells you that the business is losing money. Certain businesses operate at total margins of 10%, 20%, or more, while other types of businesses regularly operate at much narrower profit margins, as we'll see in the example below. For this reason, this metric is most useful when comparing similar businesses -- it wouldn't be too useful if you're trying to compare, say, a retail business and a tech company.
Example
Let's say that you want to compare the profitability of two similar businesses over the most-recent quarter: Wal-Mart and Target . Upon looking at Wal-Mart's income statement for the quarter ending October 31, 2015, we see that the company's total revenue was $117.4 billion, and that after all expenses, net income was $3.4 billion. Dividing the two shows a total margin ratio of 2.9%.
Target's revenue for the same quarter was $17.6 billion. Its net income of $476 million produced a total margin ratio of 2.7%. So for this particular quarter, Wal-Mart was the more-profitable company in terms of producing net income from its revenue.
Why it's useful
Total margin ratio is useful for assessing and comparing the overall profitability of businesses, and is also useful for tracking a business' profitability over time. Because of its simplicity, total margin ratio is not enough by itself to evaluate a potential investment, but it can be a good starting point.
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