Free Cash Flow Margin of VTRU for past 10 years: annual, quarterly and twelve month trailing (TTM) including Free Cash Flow Margin growth rates and interactive chart. Free cash flow margin or Free cash flow-to-sales is a performance ratio that measures operating cash flows after deduction of capital expenditures (free cash flow) relative to sales. Free cash flows (FCF) is an important metric in assessing a company's financial condition and determining its intrinsic valuation. FCF/sales is tracked over time and can be compared to a company's historical record or to peers. Free cash flow is useful because it takes out non-cash items out of earnings and only looks at the underlying operating cash coming in and out of a business minus the necessary capital expenditures.