The Complete Graham Number Guide for Stock Picking (with Calculator Link)

Posted in: Value Investing, Stock Analysis, Fundamental Metrics

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Benjamin Graham died in 1976 and people are still arguing about his formula on Reddit. That tells you something.

The Graham Number is either "the only valuation metric you need" or "hopelessly outdated" depending on who you ask. Both camps are wrong. This guide explains exactly what the Graham Number is, how to use it correctly, when it fails completely, and how to apply it to real stocks you might actually own.

Skip the philosophy. Let's get into the numbers.

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What Is the Graham Number?

The Graham Number is a formula that calculates the maximum price a defensive investor should pay for a stock. Graham described it in The Intelligent Investor (1949, revised 1973) as a way to screen for stocks trading at genuinely cheap prices relative to earnings and book value.

The formula:

Graham Number = √(22.5 × EPS × Book Value Per Share)

Where:

• EPS = Earnings Per Share (trailing twelve months)
• Book Value Per Share = (Total Assets – Total Liabilities) / Shares Outstanding
• 22.5 = The magic multiplier, derived from Graham's rule that a stock shouldn't trade above 15× earnings AND shouldn't trade above 1.5× book value (15 × 1.5 = 22.5)

If the stock's current price is below the Graham Number, it may be undervalued. If it's trading far above the Graham Number, Graham would say you're paying too much.

That's it. That's the whole thing.

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Why Graham Created It

Graham watched thousands of investors get wiped out in the 1929 crash. He spent the next two decades figuring out what separated the investors who survived from those who didn't. His conclusion: the survivors bought stocks at prices that left a margin of safety — a gap between what they paid and what the business was actually worth.

The Graham Number isn't a magic oracle. It's a filter. Graham used it to quickly discard overpriced stocks and focus analysis on the ones worth investigating further.

He was writing for small investors in the 1950s–1970s who couldn't access real-time financial data, had no Bloomberg terminals, and needed a formula they could calculate with a slide rule. The Graham Number is deliberately simple by design.

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What the Graham Number Is NOT

This matters more than the formula itself.

It is NOT a buy signal. A stock trading below its Graham Number is not automatically a good investment. It means the price is cheap relative to earnings and book value. You still need to ask why it's cheap.

It is NOT a price target. Graham never said "buy at the Graham Number, sell at 150% of it." It's a screening tool, not a complete investment thesis.

It is NOT inflation-adjusted or industry-neutral. A bank, a software company, and a utility all have completely different capital structures. Running the same formula on all three without context is comparing apples to aircraft carriers.

It is NOT predictive of short-term price movements. Graham was buying and holding for years. He didn't care about next quarter's price.

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How to Calculate It Yourself (Step-by-Step)

Let's do a real example with a stock most people own or have considered: Coca-Cola (KO).

Step 1: Find EPS

• Go to any financial data site (Macrotrends, Yahoo Finance, or our screener)
• Look for "EPS (TTM)" — trailing twelve months
• Coca-Cola's approximate EPS: $2.47

Step 2: Find Book Value Per Share

• Total equity from balance sheet ÷ shares outstanding
• Coca-Cola's approximate book value per share: $5.08

Step 3: Plug in the formula

• Graham Number = √(22.5 × $2.47 × $5.08)
• = √(22.5 × 12.55)
• = √(282.37)
• = $16.80

Step 4: Compare to current price

• Coca-Cola trades around $62–65
• That's 3.7–3.9× the Graham Number

Graham's verdict: KO is wildly overpriced by traditional value standards. But before you short it, read the next section.

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Real Examples: Apple, Microsoft, Coca-Cola, Berkshire

Apple (AAPL) — Current price ~$210

• EPS (TTM): ~$6.90
• Book Value Per Share: ~$3.77 (negative equity territory, technically)
• Graham Number: √(22.5 × $6.90 × $3.77) = √($586.10) = ~$24.20

Apple trades at roughly 8.7× its Graham Number. Graham would think this is insane. And he'd be wrong about Apple specifically — but for defensible reasons we'll discuss below.

Microsoft (MSFT) — Current price ~$410

• EPS (TTM): ~$12.93
• Book Value Per Share: ~$39.50
• Graham Number: √(22.5 × $12.93 × $39.50) = √($11,491) = ~$107.20

Microsoft trades at ~3.8× its Graham Number. Graham would pass. But MSFT has compounded at 24%+ annually for a decade. This is the limitation of the metric.

Coca-Cola (KO) — Current price ~$63

• EPS (TTM): ~$2.47
• Book Value Per Share: ~$5.08
• Graham Number: ~$16.80

Price is ~3.7× Graham Number. KO is a perpetual monopoly brand with pricing power, global distribution, and a 60-year dividend growth streak. Book value dramatically understates its actual worth. The formula fails here.

Berkshire Hathaway (BRK.B) — Current price ~$455

• EPS (TTM): ~$21.90 (operating earnings)
• Book Value Per Share: ~$270.00
• Graham Number: √(22.5 × $21.90 × $270) = √($133,155) = ~$364.90

This is actually useful. BRK.B trading at 1.25× its Graham Number means Buffett's holding company is reasonably valued by Graham standards. Berkshire is asset-heavy and earnings-grounded — exactly what the formula was designed for.

A Bonus Example Where Graham Number WORKS: Verizon (VZ)

• EPS (TTM): ~$3.10
• Book Value Per Share: ~$24.50
• Graham Number: √(22.5 × $3.10 × $24.50) = √($1,709.25) = ~$41.30

Verizon trades around $40–42. Right at its Graham Number. This is the formula's sweet spot: a capital-intensive, predictable earnings business trading near intrinsic value. For a defensive income investor, this is interesting.

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When the Graham Number Completely Fails

The formula breaks down in four specific situations:

1. High-Growth Technology Companies

Apple, Microsoft, Nvidia, and Google all generate extraordinary earnings from software, platforms, and ecosystems that have near-zero book value. Their competitive advantages (brand, switching costs, network effects) don't appear on a balance sheet. Book value is irrelevant. The formula massively underestimates their worth.

Fix: Don't use Graham Number for growth stocks. Use DCF or price/earnings-to-growth (PEG ratio) instead.

2. Banks and Financial Institutions

Banks' assets are loans — which look great on a balance sheet until they default. The book value of a bank during normal times vs. a credit crisis are completely different numbers. Graham actually warned investors about banks in the original text. He preferred industrial companies.

Fix: For banks, use price-to-tangible-book-value (P/TBV) and return on equity (ROE) instead.

3. REITs

Real Estate Investment Trusts are required to distribute 90%+ of taxable income, which means they can't retain earnings to grow book value. Their actual economic value is in the real estate they own — which may be worth far more or far less than book value depending on market conditions.

Fix: For REITs, use price/FFO (Funds From Operations) and dividend yield vs. sector average.

4. Companies With Negative Book Value

Amazon operated with negative tangible book value for years. Apple's aggressive buybacks have pushed book value near zero. The Graham Number formula simply doesn't compute when book value is zero or negative.

Fix: If book value is negative, the Graham Number is invalid. Move on.

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How to Use the Graham Number Practically in 2026

Here's the honest answer: the Graham Number works best as a first-pass filter, not a final decision.

Use it to eliminate the obviously overpriced stocks from your watchlist. If a stock trades at 5× its Graham Number, you need an extraordinary reason to own it. That reason might exist (Apple, Microsoft) — but you'd better know what it is.

Use it to identify potentially undervalued candidates. If a profitable company with growing earnings trades at 0.7–1.0× its Graham Number, that's worth a serious second look. You're not buying blindly — you're prioritizing your deeper analysis.

The three-step workflow:

1. Calculate Graham Number — takes 2 minutes with our calculator
2. If price < Graham Number: Deep dive. Is earnings sustainable? Is book value real?
3. If price > 1.5× Graham Number: Understand why before touching it. Are you buying quality or paying for hype?

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Your Action Plan for This Week's Purchases

Before you buy anything this week, run this checklist:

Step 1: Pull up the stock on the Value of Stock Graham Number Calculator. Enter the EPS and book value per share. The tool pulls live data for most US-listed stocks.

Step 2: Note the ratio: Current Price ÷ Graham Number. Below 1.0 = potentially undervalued. 1.0–1.5 = fairly valued. Above 2.0 = proceed with clear thesis.

Step 3: Check what sector the company is in. If it's a bank, REIT, or high-growth tech: treat the Graham Number as informational only. Use sector-appropriate metrics instead.

Step 4: Combine the Graham Number with at least one other metric. Debt-to-equity ratio (below 1.0 is conservative), return on equity (above 10% is solid), and free cash flow margin (above 10% for most industries) round out the picture.

Step 5: Ask the hard question: "Is the earnings number real?" Look at the free cash flow. If the company reports $5/share in EPS but generates $1.50/share in free cash flow, the earnings are inflated. The Graham Number is only as good as the inputs.

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Screener Integration: Finding Graham Number Opportunities

The manual calculation works. But if you want to screen across thousands of stocks quickly — filter by Graham Number ratio, combine with debt levels, dividend yield, and FCF margin — the Value of Stock Screener does this automatically.

Filter for:

• Graham Number ratio < 1.2
• Positive EPS (last 3 years)
• Debt-to-equity < 1.5
• Positive free cash flow

This combination pulls up the list of stocks that Graham himself would have put on his watchlist. It's not guaranteed wins — it's a curated starting point for serious analysis.

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The Bottom Line

The Graham Number is 70+ years old and still sparks debate because it works — just not everywhere and not always. It identifies cheap stocks by combining earnings power and asset value into a single, digestible number. Use it as a filter, not a conclusion. Apply it to the right types of businesses. Ignore it for growth stocks, banks, and REITs.

Graham's deeper point wasn't the formula. It was the discipline: don't pay more for a business than it's actually worth. In a market where the S&P 500 trades at 22× earnings with growth expectations baked in, the Graham Number reminds you that margin of safety still matters.

The investors who use it aren't looking for the next 10-bagger. They're looking for the stocks everyone else is ignoring because they're boring, cheap, and quietly printing cash.

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Use the Calculator

Stop doing this math by hand. Plug in any ticker at the Value of Stock Graham Number Calculator and get the ratio instantly with context on whether the stock is worth a deeper look.

Want a weekly email with the 5 best Graham Number candidates screened from 4,000+ stocks? Subscribe to the Value Brief. We do the screening. You make the calls.

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All figures are approximate and based on publicly available data as of early 2026. This is educational content, not financial advice.