Financial ratios are used against another company, or in comparison with the industry average in order to benchmark or measure a company’s performance. They are based on data found in balance sheets, income statements and sometimes based on share prices.
SEC filings will also contain financial ratios. You can search for the company name and "investor relations" to find the company's page. From the company's investor relations page, there should be a link to company financials, where you can access SEC filings.
Use the search box to locate a company and view their financial summary. From the main company page, you can navigate to historical data, financials and ratios, in addition to other resources.
Search using the "Search stocks, ETfs, and more" search box on the right side of the screen. The use the analysis tools, such as "Summary," "Financials," "Analysis," and "Earnings" to search for key ratios and explore financials.