Stock Valuation Guide: DCF, P/E, Free Cash Flow and Fair Value

Stock Valuation Guide: DCF, P/E, Free Cash Flow and Fair Value

A practical stock valuation framework using Micron as a real case study.

Valuation is not the search for one perfect number.

It is the process of translating a business thesis into a range of prices, then asking which assumptions must be true for each price to make sense.

That distinction matters because two investors can study the same company, agree on its revenue and earnings, and still reach very different estimates of fair value.

One investor may use a discounted cash-flow model. Another may focus on earnings and a P/E multiple. A third may value free cash flow. A fourth may start with the market price and work backward through a reverse valuation.

The model matters.

The assumptions matter even more.

In this guide, we will use Micron Technology (NASDAQ: MU) as a real-world case study. We will combine two sources:

• the BE THE INVESTOR Micron Q4 FY2026 Investment Research report dated October 1, 2026; and
• BTI's live Stock Valuation Calculator screenshots supplied for this guide.

The two frameworks do not produce identical values — and that is useful. They use different inputs, formulas, time horizons and assumptions. The differences help demonstrate one of the most important lessons in valuation:

Fair value is model-dependent. The investor's job is to understand why the outputs differ, not simply choose the highest number.

If you want the broader research process first, read our Complete Investment Research Guide, How to Analyze a Stock, and Financial Statements Guide.

What You Will Learn

By the end of this guide, you should understand how to:

• separate market price from estimated fair value;
• use P/E as a valuation framework without blindly applying a multiple;
• value a company using free cash flow and P/FCF;
• understand the logic of a DCF model;
• choose between valuation models depending on the business;
• build conservative, base and optimistic scenarios;
• use probability-weighted fair value;
• perform reverse valuation to understand what the market is pricing in;
• use sensitivity analysis without mistaking it for certainty;
• apply a margin of safety to estimate a desired entry price;
• connect valuation back to revenue growth, margins, cash flow and cycle risk.

The objective is not to make valuation look precise.

The objective is to make your assumptions visible.

Meet the Case Study: Micron After Q4 FY2026

Micron's Q4 FY2026 report created an unusually interesting valuation problem.

The business was producing extraordinary financial results:

• Q4 Revenue: $54.23B
• GAAP Gross Margin: 86.8%
• GAAP EPS: $32.87
• Q4 Adjusted Free Cash Flow: $33.20B
• Q1 FY2027 Revenue Guide: $61.5B midpoint
• Reference Price in the research report: $1,065.11

The business thesis strengthened.

The valuation question became harder.

Why?

Because investors were no longer debating whether Micron's earnings were strong. They were debating how long exceptionally high memory pricing, margins and cash generation could persist.

The BTI research summarized the problem well: Micron looked inexpensive on near-term annualized earnings, but not necessarily on normalized memory-cycle earnings.

BTI Micron Q4 FY2026 Research — Income Statement: exceptional operating leverage from pricing and mix.

Step One: Understand What Fair Value Actually Means

A stock's market price is observable.

Fair value is estimated.

The market tells you what investors are willing to pay now.

A valuation model asks what the business may be worth under a specific set of assumptions.

Those assumptions may include:

• future revenue growth;
• future profit margins;
• future free cash flow;
• share-count changes;
• discount rate or required return;
• terminal growth;
• future P/E or P/FCF multiple;
• the degree to which current earnings are cyclical or sustainable.

This is why a fair-value estimate should always be read with an invisible sentence after it:

“This value is reasonable if these assumptions are reasonable.”

Before Valuation: Normalize the Business

One of the most dangerous valuation mistakes is taking peak earnings and treating them as permanent.

Micron is an ideal teaching example because memory has historically been cyclical.

Q4 FY2026 was exceptional:

• Revenue increased 379% year over year.
• Gross margin expanded from 44.7% to 86.8%.
• GAAP operating income reached $43.75B.
• GAAP net income reached $37.70B.
• Adjusted free cash flow reached $33.20B.

The numbers were real.

The valuation question is whether they represent a new structural earnings regime or a powerful cyclical peak.

That is why valuation must begin with fundamental research, not with a multiple.

Investor Questions Before Opening Any Model

• Are current margins sustainable?
• How much revenue growth is driven by pricing versus physical bit growth?
• Will HBM and data-center demand make the cycle structurally less volatile?
• Will strategic customer agreements reduce downside?
• How much future capex is required to support capacity?
• Will future supply growth eventually pressure pricing?

Step Two: P/E Valuation — Simple Formula, Difficult Assumptions

The price-to-earnings framework is one of the simplest valuation methods.

Estimated Value = Earnings Per Share × Appropriate P/E Multiple

The formula is easy.

The hard part is deciding which earnings and which multiple belong in the equation.

Micron's Reported P/E Signals

At the research report's $1,065.11 reference price:

• FY2026 GAAP P/E: 14.3x
• FY2026 Non-GAAP P/E: 14.1x
• Q1 FY2027 annualized run-rate P/E: about 7.0x

A 7x run-rate P/E sounds extremely inexpensive.

But that number assumes Q1's earnings power is representative enough to annualize.

If memory pricing and margins normalize, the denominator — earnings — can decline sharply.

Practical Example: The Same Stock at Three Multiples

Suppose normalized EPS is $150.

• At 6x earnings, fair value would be about $900.
• At 8x earnings, fair value would be about $1,200.
• At 10x earnings, fair value would be about $1,500.

The difference does not come from arithmetic.

It comes from what investors believe about durability.

Investor Question: What evidence would justify giving Micron a permanently higher multiple than a traditional memory-cycle company?

Step Three: Free Cash Flow Valuation

Earnings tell us what the accounting system says the business earned.

Free cash flow asks how much cash remained after the investment required to operate and expand the business.

Micron's Q4 and full-year cash generation were exceptionally strong.

• Q4 Operating Cash Flow: $43.97B
• Q4 Net Capex: $10.77B
• Q4 Adjusted FCF: $33.20B
• FY2026 Operating Cash Flow: $89.68B
• FY2026 Adjusted FCF: $62.31B

The report calculated full-year operating cash flow at 105.5% of GAAP net income.

That is important because the earnings were not merely accounting profits. Cash generation supported them.

BTI Micron Q4 FY2026 Research — Cash Flow: operating cash flow and adjusted free cash flow scaled with earnings.

A Simple P/FCF Framework

Equity Value ≈ Free Cash Flow × Appropriate P/FCF Multiple

On a per-share basis, the investor can use free cash flow per share and an appropriate P/FCF multiple.

Again, the challenge is not multiplication.

The challenge is normalization.

If current free cash flow reflects unusually high memory pricing, an aggressive multiple on peak FCF can overstate value.

If contracts, HBM mix and supply discipline make cash flow structurally more durable, a higher multiple may be justified.

Step Four: DCF — Value the Cash, Not the Narrative

A discounted cash-flow model estimates the present value of future cash flows.

In simplified form:

Enterprise Value = Present Value of Forecast Cash Flows + Present Value of Terminal Value

Then the investor adjusts for cash, debt and other claims to estimate equity value.

A DCF requires several assumptions:

• future revenue;
• operating or FCF margins;
• capital expenditures;
• taxes;
• working capital;
• discount rate;
• terminal growth or terminal multiple.

Every one of those variables can move the answer.

Why DCF Can Be Difficult for Micron

A DCF works best when future cash flows are reasonably predictable.

Micron's current economics are unusually sensitive to:

• memory pricing;
• industry bit supply;
• HBM mix;
• customer contracts;
• future fab capacity;
• capital spending;
• cycle normalization.

That does not make DCF useless.

It means the model should be scenario-based rather than presented as one precise answer.

Different Models Can Produce Very Different Fair Values

This is visible directly inside the BTI valuation system.

In the model-comparison screenshot supplied for this guide, Micron was evaluated using several models:

• EPS / FCF Model: fair value $1,082.53
• DCF Model: fair value $2,847.68
• Revenue Model: fair value $918.80

Those outputs are dramatically different.

That is not automatically a problem.

Each model is answering the valuation question from a different angle.

BTI Model Comparison: different valuation methods can produce materially different fair values.

What Should the Investor Do With Conflicting Models?

Do not average them blindly.

Ask why they disagree.

• Is the DCF assuming unusually durable future cash flow?
• Is the revenue model applying a conservative sales multiple?
• Is the EPS/FCF model anchoring more heavily to current reported economics?
• Which model best matches the economics of the company?

Investor Question: Which valuation model is most vulnerable to being wrong if today's margins are near a cycle peak?

Step Five: Build the Assumptions Explicitly

A valuation model becomes more useful when the assumptions are visible.

One BTI calculator snapshot supplied for this guide showed the following Micron base data:

• Current Price: $1,074.89
• Shares: 1,129M
• TTM Revenue: $133.19B
• TTM Net Income: $84.97B
• TTM FCF: $52.91B
• Net Debt: -$38.75B, indicating net cash in that data snapshot
• Market Cap: about $1.21T
• Current P/E: 14.3x
• Current P/FCF: 22.9x

The base-case assumptions displayed in that snapshot included:

• 5 years forward;
• 15% revenue CAGR;
• 22% net margin;
• 18% FCF margin;
• 30x exit P/E;
• 28x exit P/FCF;
• 0% annual share-count change;
• 10% required annual return.

BTI valuation calculator: base financial data, editable assumptions and model output for Micron.

The Most Important Part of This Screen Is Not the Fair Value

It is the assumption panel.

A fair value of $1,801.52 only has meaning in the context of the assumptions that produced it.

Change the growth rate.

Change the margin.

Change the exit multiple.

Change the required return.

The answer changes.

This is why valuation tools should make assumptions editable rather than hide them.

Step Six: Build Conservative, Base and Optimistic Cases

Scenario analysis is one of the best defenses against false precision.

Instead of asking:

What is Micron worth?

Ask:

What is Micron worth if the cycle normalizes quickly, if current economics partially persist, or if AI memory creates a structurally stronger cycle?

BTI Calculator Scenario Snapshot

The supplied calculator screenshot showed:

Conservative Scenario

• Revenue Growth: 8%
• Net Margin: 18%
• Fair Value Today: $1,191.11

Base Scenario

• Revenue Growth: 15%
• Net Margin: 22%
• Fair Value Today: $1,801.52

Optimistic Scenario

• Revenue Growth: 25%
• Net Margin: 28%
• Fair Value Today: $2,646.85

The same screen applied probabilities of 30% conservative, 50% base and 20% optimistic, producing a probability-weighted fair value of $1,787.46.

BTI scenario analysis: Conservative, Base and Optimistic cases with probability-weighted fair value.

The Research Report Uses a Different Scenario Framework

The Micron research report also built bear, base and bull scenarios, but it used a different horizon and different assumptions.

The report's 12–18 month framework estimated:

• Bear: $763
• Base: $1,291
• Bull: $1,919

Using 25% bear, 50% base and 25% bull probabilities produced an illustrative value of about $1,316 per share.

Why does that differ from the calculator's probability-weighted $1,787.46?

Because they are not the same model.

The report uses a 12–18 month recurring-EPS and cycle-multiple framework. The calculator screenshot uses its own active EPS/FCF settings and user-adjustable assumptions.

That difference is educational rather than contradictory.

Never compare two fair-value numbers without first comparing the assumptions, model and time horizon behind them.

BTI Micron Research — Bear, Base and Bull scenarios show how revenue, margins and the earnings multiple drive value.

Micron BTI Research Scenario Values

763

Bear

1291

Base

1919

Bull

Source: BE THE INVESTOR Micron Q4 FY2026 Research

$ per share

BTI Micron research report 12–18 month illustrative scenario values.

Step Seven: Probability-Weighted Valuation

No investor knows with certainty which scenario will occur.

Probability weighting gives us a way to acknowledge that uncertainty.

Probability-Weighted Fair Value = Σ (Scenario Value × Scenario Probability)

Suppose:

• Bear value = $800 with 25% probability;
• Base value = $1,300 with 50% probability;
• Bull value = $1,900 with 25% probability.

The weighted value would be:

$800 × 25% + $1,300 × 50% + $1,900 × 25% = $1,325.

This does not make $1,325 “the correct price.”

It gives the investor a disciplined way to combine multiple plausible futures.

Investor Question

Are my probabilities based on evidence, or am I quietly assigning the highest probability to the scenario I want to believe?

Step Eight: Sensitivity Analysis

Scenario analysis changes several assumptions at once.

Sensitivity analysis changes one or two variables systematically to show how much they affect value.

Common sensitivity variables include:

• revenue growth;
• gross or net margin;
• discount rate;
• exit P/E;
• exit P/FCF;
• terminal growth.

The BTI sensitivity screenshot supplied for this guide displays fair value across a range of exit multiples from 15x to 44x and revenue-growth rows from 5% to 35%.

BTI sensitivity analysis: test how fair value changes when important assumptions move.

How to Read a Sensitivity Table

Do not search for the greenest cell.

Ask:

• How wide is the valuation range?
• Which assumption changes value the most?
• What range of assumptions is historically plausible?
• Which cells require almost perfect execution?
• Which cells still produce an acceptable outcome under disappointment?

In the supplied sensitivity screen, the displayed values change across exit multiples while the visible growth rows show the same values. That is a useful reminder to verify exactly how the active model uses each input and make sure the sensitivity view is testing the variables you intend to analyze.

Investor Question: If a small change in one assumption destroys the valuation case, how much confidence should you place in the headline fair value?

Step Nine: Reverse Valuation — Start With the Price

Traditional valuation starts with assumptions and produces a price.

Reverse valuation starts with the price and asks:

What must the company earn for today's price to make sense?

This is especially useful for a cyclical company because it reduces the temptation to argue about one target price.

The BTI Micron report used the $1,065.11 reference price and asked how much FY2027 EPS would be required under different P/E multiples.

• 5.5x P/E: required EPS $193.66
• 7.5x P/E: required EPS $142.01
• 9.5x P/E: required EPS $112.12

Using the report's base-model margin assumptions, those earnings levels implied very different revenue requirements.

BTI Micron Research — Reverse valuation asks what earnings the market price already requires.

Why Reverse Valuation Is So Powerful

Instead of saying:

I think Micron should trade at $1,500.

You can ask:

At the current price, what earnings and multiple is the market effectively assuming?

Then compare those implied requirements with your fundamental research.

If the market requires only modest earnings relative to your normalized estimate, the stock may have a valuation cushion.

If the market price requires perfect margins and perpetual shortage economics, the risk is much higher.

Step Ten: Margin of Safety and Desired Entry Price

Fair value and entry price are not necessarily the same thing.

Many investors require a margin of safety because every valuation model contains uncertainty.

Desired Entry Price = Fair Value × (1 − Margin of Safety)

In the supplied BTI screenshot:

• Calculated Fair Value: $1,801.52
• Desired Margin of Safety: 20%
• Desired Entry Price: $1,441.21
• Current Price in the snapshot: $1,074.89

The current price shown in that snapshot was below the selected desired-entry threshold.

BTI Desired Entry Price: fair value, margin of safety and a desired entry-price framework.

Why Margin of Safety Matters

The investor may be wrong about:

• revenue growth;
• memory pricing;
• gross margins;
• capex;
• future supply;
• the appropriate multiple.

A margin of safety does not eliminate those risks.

It attempts to avoid paying a price that requires every assumption to be correct.

Step Eleven: Micron Case Study — Build the Valuation From the Business Up

Now we can combine the process into one case study.

1. Start With the Financial Quality

Micron's Q4 FY2026 financial statements were unusually strong.

• GAAP EPS and non-GAAP EPS differed by only $0.55.
• Operating cash flow exceeded full-year GAAP net income.
• Q4 adjusted FCF margin was 61.2%.
• Net cash was approximately $68.3B.

This means the valuation debate is not primarily about whether the latest earnings were artificial.

It is about durability.

See the Micron cash-flow research visual shown earlier in this guide.

2. Identify the Cycle Variable

Q4 revenue was nearly five times the prior-year level while cost of goods sold rose only 15%.

That drove gross margin to 86.8%.

The valuation cannot simply assume that level lasts forever.

The central question becomes:

How much of this margin expansion is structural, and how much is temporary shortage pricing?

3. Use Contracts to Adjust the Historical Cycle View

Micron reported:

• 26 strategic customer agreements;
• about $150B of RPO;
• $32B of customer financial commitments;
• $12.75B of customer deposits in FY2026;
• more than 75% of FY2027 shipments committed.

Those agreements may reduce some historical cycle volatility.

But they do not guarantee permanent peak margins.

4. Build the Downside Case

Ask what happens if:

• gross margin falls to 80%;
• FY2027 revenue is closer to $250B;
• investors apply only 5.5x earnings.

The BTI report's bear framework produced about $763 per share.

5. Build the Base Case

The report's base case used:

• FY2027 revenue of $280B;
• gross margin of 87%;
• non-GAAP EPS of about $172.1;
• 7.5x P/E.

That produced an illustrative value of about $1,291.

6. Build the Bull Case

The report's bull case assumed:

• FY2027 revenue of $315B;
• gross margin of 89%;
• non-GAAP EPS of about $202;
• 9.5x P/E.

That produced about $1,919.

7. Compare With the BTI Calculator

The calculator provides an independent way to stress the thesis using editable assumptions, alternative valuation models, a margin-of-safety framework and probability weighting.

Do not ask which number is “right.”

Ask what assumptions produce each number.

8. Reverse the Price

At the report's $1,065.11 reference price, a 7.5x P/E requires about $142 of EPS.

That is below the report's $172.1 base-case EPS.

But if earnings normalize sharply, the apparent valuation cushion can disappear.

9. Define the Evidence That Would Change the Model

The BTI report's monitoring framework highlights several variables:

• Q1 revenue versus the $61.5B midpoint;
• gross margin staying above roughly 85% and recovering after Q1;
• RPO conversion;
• customer deposits converting into deliveries;
• adjusted FCF remaining strong despite rising capex;
• DIO beginning to decline;
• industry bit supply not overtaking demand.

BTI Micron Research — Investor Dashboard: observable evidence that can strengthen or weaken the valuation thesis.

The Case Study Conclusion

A weak valuation conclusion would say:

Micron trades at a low P/E, so the stock is cheap.

A stronger conclusion says:

Micron looks inexpensive on current and near-term earnings, but those earnings are unusually high. Fair value therefore depends on how much of AI-driven memory pricing, contract visibility and premium margins survives the next capacity cycle. The valuation should be expressed as a scenario range and updated as evidence arrives.

That is the difference between a multiple and a valuation process.

Common Valuation Mistakes

Using Peak Earnings as Normalized Earnings

A low P/E can be misleading when earnings are unusually high.

Choosing the Highest Model Output

If DCF says $2,800 and another model says $900, the answer is not to choose the one you prefer.

Investigate the assumptions.

Ignoring Cash Flow

Earnings multiples can look attractive while cash conversion deteriorates.

For Micron, current cash quality is strong, but future capex remains critical.

Using One Scenario

A single fair value hides uncertainty.

Bear, base and bull cases make uncertainty visible.

Using a Multiple Without a Reason

Why 30x?

Why 8x?

The multiple should reflect growth, durability, cyclicality, capital intensity and confidence.

Ignoring the Balance Sheet

Micron's approximately $68.3B of net cash materially affects equity value and downside resilience.

Confusing Price Target With Desired Entry Price

Fair value estimates what the business may be worth.

Desired entry price incorporates the investor's margin of safety.

Forgetting That the Model Must Change

Valuation is not a one-time spreadsheet.

New earnings, guidance, pricing and capex information should update the model.

Investor Questions Before You Trust a Fair Value

• What earnings are being capitalized — current, forward or normalized?
• What would cause the P/E multiple to compress?
• How sensitive is the value to margin normalization?
• How much future cash flow must be reinvested as capex?
• Does the model assume share repurchases?
• How much of the value comes from terminal assumptions?
• Does the model reflect the balance sheet?
• Are bear-case assumptions genuinely uncomfortable, or just slightly less optimistic?
• What market expectations are already embedded in the current price?
• What new evidence would force you to change the model?

Frequently Asked Questions

What is stock valuation?

Stock valuation is the process of estimating what a company's equity may be worth based on its earnings, cash flow, growth, financial position and the return investors require.

What is a DCF model?

A discounted cash-flow model estimates the present value of future cash flows by forecasting them and discounting them back to today using a required rate of return.

How does P/E valuation work?

A P/E framework multiplies an earnings-per-share estimate by a chosen earnings multiple. The difficult part is selecting normalized earnings and a multiple appropriate for the company's growth and risk.

What is a P/FCF valuation?

P/FCF compares equity value with free cash flow. It can be useful when cash generation better represents the business economics than accounting earnings.

What is fair value?

Fair value is an estimate based on a model and assumptions. It is not a guaranteed future price.

What is reverse valuation?

Reverse valuation starts with the current market price and calculates what earnings, revenue, margins or growth would be needed to justify that price.

Why use a margin of safety?

A margin of safety creates a buffer between estimated fair value and desired purchase price because forecasts and valuation assumptions can be wrong.

Why do different valuation models produce different answers?

Models use different inputs and economic relationships. DCF focuses on discounted future cash flow, P/E focuses on earnings and a multiple, and revenue models focus on sales economics. Different assumptions naturally produce different estimates.

Which valuation model is best for Micron?

No single model eliminates Micron's cycle risk. A useful process can combine normalized earnings, free cash flow, scenario analysis and reverse valuation, while using DCF as an additional sensitivity framework rather than treating one output as definitive.

How to Use the BTI Stock Valuation Calculator

A disciplined workflow is:

1. Open the BTI Stock Valuation Calculator.
2. Select the company.
3. Review the base financial data.
4. Compare the available valuation models.
5. Choose conservative assumptions before optimistic ones.
6. Build bear, base and optimistic scenarios.
7. Review probability-weighted fair value.
8. Use the sensitivity table to identify the assumptions that matter most.
9. Run reverse valuation against the current price.
10. Apply a margin of safety to define a desired entry price.
11. Return after earnings and update the assumptions.

The purpose of the tool is not to tell you what a stock is “really worth.”

It is to make the valuation process transparent enough that you can see what must be true for your conclusion to hold.

Open the BTI Stock Valuation Calculator

Sources and Method

The Micron case-study figures in this guide are based on the BE THE INVESTOR Micron Q4 FY2026 Investment Research report dated October 1, 2026. That report ties reported facts to the SEC-filed earnings release, Micron's earnings deck and prepared remarks, while clearly separating management claims, Street estimates, model-derived outputs and BTI analyst judgment.

The BTI Stock Valuation Calculator screenshots were supplied separately for this guide and represent calculator configurations and market data shown at the time each screenshot was captured. Calculator values may differ from the research report because they use different data snapshots, formulas, settings and valuation horizons.

Disclosure: This guide is for educational and analytical purposes only. Fair-value estimates, scenarios, reverse valuations and entry-price calculations are model outputs, not guarantees or personalized investment advice. Investors should verify current financial statements, market prices and assumptions before acting.

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