How to Calculate a Stock's Intrinsic Value

June 5, 2026 · 9 min read

Discounted cash flow, P/E-based valuation, Graham Number, and ROIC-based methods — when to use each and how to interpret the results.

What is intrinsic value?

Intrinsic value is the estimate of what a stock is actually worth based on its underlying business — independent of its current market price. If the current price is below intrinsic value, the stock may be undervalued. If it is above, it may be overvalued.

The concept comes from Benjamin Graham and Warren Buffett's value investing framework: you are buying a piece of a business, not just a ticker symbol. Understanding what that business is worth gives you a rational basis for deciding whether the current price represents a good deal.

No single intrinsic value calculation is definitive — each method makes different assumptions about growth, risk, and the discount rate. Smart investors use multiple methods together and look for convergence rather than relying on any one number.

The four main valuation methods

Discounted Cash Flow (DCF)

Best for: Profitable companies with predictable cash flows

DCF projects a company's future free cash flows and discounts them back to present value using a required rate of return (discount rate). The result is the theoretical present value of all future cash flows the business will generate. DCF is the most theoretically rigorous method but is highly sensitive to assumptions about growth and the discount rate — small changes in these inputs produce very different valuations.

P/E-Based Valuation

Best for: Mature, profitable companies in stable sectors

Multiply normalised earnings per share (EPS) by a 'fair' P/E multiple — typically the sector average or the company's historical average P/E. Simple and widely used, but requires you to make a judgment about what P/E is appropriate for the business. Works poorly for unprofitable or highly cyclical companies.

Graham Number

Best for: Conservative, asset-backed value screening

The Graham Number is sqrt(22.5 × EPS × book value per share). Benjamin Graham proposed this as a rough upper limit on a stock's fair price. It is a conservative, balance-sheet-oriented screen — best for finding deeply undervalued traditional businesses rather than high-growth technology companies.

ROIC-Based Valuation

Best for: Evaluating capital allocation quality

Compares return on invested capital (ROIC) to the cost of capital (WACC). A company that consistently earns ROIC above its WACC is creating value. This method is less about a specific price target and more about whether the business is worth owning at any price. Companies with persistently high ROIC tend to compound value well over time.

Key inputs that drive intrinsic value calculations

Free cash flow — the cash a business generates after capital expenditure; this is the raw material of DCF valuation
Revenue growth rate — higher expected growth rates increase intrinsic value; over-optimistic growth assumptions are the most common DCF error
Operating margin — how much of each revenue dollar converts to operating profit; stable high margins create more reliable intrinsic value
Discount rate / WACC — the required return you demand for owning the stock; higher rates reduce intrinsic value; often set at 8–12% for equity
Terminal growth rate — the long-run growth rate used to value cash flows beyond the forecast period; typically 2–3% for mature businesses

Common mistakes in intrinsic value analysis

Using recent high-growth years as a baseline — reversion to mean growth is more common than sustained hypergrowth
Ignoring the discount rate — higher interest rates increase the discount rate and mechanically reduce the intrinsic value of long-duration assets like growth stocks
Treating the DCF output as precise — it is a range with wide uncertainty bands, not a specific number
Forgetting debt — enterprise value calculations should account for net debt; the intrinsic value of equity is the business value minus debt
Anchoring on analyst price targets as proxies for intrinsic value — price targets are often based on relative valuation, not fundamental intrinsic value

How to use multiple methods together

The most robust approach is to calculate intrinsic value using two or three methods and see where they converge. If your DCF, P/E-based estimate, and Graham Number all suggest a stock is worth roughly $80–100 per share, and it is trading at $65, that convergence gives you more confidence than any single method alone.

Wide divergence between methods (e.g. DCF says $200, Graham Number says $40) is a signal that the business has unusual characteristics — perhaps rapid growth that DCF captures but Graham's conservative method cannot, or significant intangible assets that depress book value.

Calculate intrinsic value for any stock

BriMindInvest's Intrinsic Value tool runs DCF, P/E-based, Graham Number, and ROIC-based estimates for any stock — all in one place.

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