Valuing a Business the Buffett Way
A business is worth the cash it will return to owners over its lifetime, discounted back to today. That single idea — the discounted cash flow (DCF) model — is how Warren Buffett frames intrinsic value, and it is the engine behind this calculator. Instead of trusting a reported earnings number, Buffett looks at owner earnings: the cash a company genuinely produces after the capital needed to maintain its competitive position.
The calculator runs a three-stage model. It takes a company's free cash flow from the last five years (pre-filled from SEC filings for covered tickers), projects it forward at a growth rate you choose, discounts those future flows at a rate that reflects risk, and adds the value of any net cash on the balance sheet. Divide by shares outstanding and you get an intrinsic value per share you can compare to the live market price.
The whole point of the exercise is the gap Buffett calls the margin of safety. If a stock trades 30% below your conservative DCF value, you have a cushion against being wrong. If it trades above it, no amount of storytelling justifies paying up. Our Margin of Safety ranking surfaces the stocks in our coverage that clear that bar right now.
Buffett has returned to these ideas for decades. His 1986 letter explains why reported earnings can mislead, and the 1992 letter walks through intrinsic value directly. For the broader framework, see our guides to intrinsic value and economic moat, then pair any DCF with a ValueOS Score and a Moat analysis to judge both price and quality.
Valuations are models, not promises. Every input here is derived from public SEC filings, never estimates or AI-generated figures. Use the result as one input in your own research — not as investment advice.
Worked Example — Apple (AAPL)
Take Apple (AAPL). Pull its free cash flow from the last five years, project it forward at a conservative 8–10% growth, discount those flows at roughly 9% to reflect risk, add net cash on the balance sheet, and divide by shares outstanding — that is the intrinsic value per share.
Compare it to the live price: a wide gap below your conservative value is the margin of safety Buffett demands. Open the calculator, type AAPL, and drag the growth and discount assumptions to see how sensitive the valuation is.
Frequently Asked Questions
How does Warren Buffett use DCF to value a stock?
Buffett treats a business as worth the present value of the cash it will distribute over its lifetime. He prefers owner earnings over reported net income and insists on a margin of safety between price and intrinsic value. This calculator applies that three-stage DCF lens to any U.S. stock using data pulled from SEC filings.
What inputs do I need for the DCF calculator?
You need free cash flow (or owner earnings) for the past 5 years, an expected long-term growth rate, a discount rate, and shares outstanding. For covered tickers ValueOS pre-fills these fields from SEC EDGAR XBRL so you only adjust the assumptions you want to test.
What is a good margin of safety on a DCF valuation?
Buffett looks for a meaningful discount — often 30% or more — between market price and intrinsic value to cushion against errors and bad luck. See our Margin of Safety ranking for stocks currently trading below their DCF-derived value.
Is this DCF calculator free?
Yes. ValueOS's DCF, Score, and Moat tools are free and built from primary SEC data — no account or subscription required.
DCF vs. Moat vs. Score — Which Tool?
| Dimension | DCF Calculator Intrinsic value from cash flows | Moat Analyzer Durable competitive advantage | ValueOS Score Quality + value composite |
|---|---|---|---|
| What it measures | Price vs. conservative intrinsic value (margin of safety) | Quality of the business (brand, switching costs, network, scale) | Both business quality and valuation in one composite |
| Best for | Judging whether a stock is cheap or expensive right now | Finding wonderful businesses worth holding for decades | Screening a universe of stocks for the best risk-adjusted bets |
| Your input | Free cash flow from SEC filings + your growth & discount assumptions | Moat signals traced across 60 years of Berkshire letters + fundamentals | 5,000+ covered stocks scored from SEC filings on Buffett's dimensions |
| What you get | Intrinsic value per share vs. live market price | Moat rating + the letters that reveal the thesis | 0–100 Score ranking quality against price |
Buffett weighs both price and quality. Most investors run a Score to find candidates, a Moat check to confirm the business is durable, and a DCF to make sure the price leaves a margin of safety.