Graham Number Calculator - Value Investing Tool
Calculate stock fair value using the Graham Number Online tool. Assess your margin of safety and identify undervalued investment opportunities with this expert tool.
Related Utilities
The Historical Significance of the Graham Number Online Formula
Benjamin Graham, often hailed as the father of value investing, sought a simple, conservative method to identify stocks that were potentially undervalued. The Graham Number represents a quick, back-of-the-envelope calculation to estimate the maximum price a defensive investor should pay for a stock. In the current era, using a Graham Number Online calculator allows investors to perform this assessment instantly, removing the friction of manual arithmetic. By combining a company's per-share earnings with its book value, this metric provides a quantitative baseline for fair value.
How the Graham Number Formula Functions Mathematically
The core logic resides in the relationship between Earnings Per Share (EPS) and Book Value Per Share (BVPS). Graham’s original heuristic suggested that the product of the price-to-earnings (P/E) ratio and the price-to-book (P/B) ratio should not exceed 22.5. This constant is derived from the assumption that a stock should not have a P/E greater than 15 and a P/B greater than 1.5 simultaneously ($15 \times 1.5 = 22.5$).
The Graham Number formula is defined as the square root of 22.5 times the EPS and the BVPS:
$$ \text{Graham Number} = \sqrt{22.5 \times \text{EPS} \times \text{BVPS}} $$
If the current market price is substantially lower than this calculated value, the investor theoretically has a margin of safety. This formula assumes the company has positive earnings and a positive book value, making it unsuitable for speculative growth stocks with negative metrics.
Configuring Stock Metrics for Graham Number Analysis
To get an accurate fair value estimate, you must provide three core inputs into the tool. These settings dictate the output calculation and the resulting valuation status.
| Input Setting | Description | Recommended Data Source |
|---|---|---|
| Earnings Per Share (EPS) | The company's annual net income divided by excellent shares. | Latest annual financial reports (10-K). |
| Book Value Per Share (BVPS) | Total equity divided by the number of excellent shares. | Latest company balance sheet. |
| Current Stock Price | The real-time market trading price of the equity. | Market exchange data. |
Comparing Valuation Status and Margin of Safety Indicators
The tool categorizes stocks into three distinct valuation tiers based on their proximity to the calculated fair value. Understanding these statuses is necessary for applying the Benjamin Graham fair value logic effectively.
Strong Buy (Undervalued)
Triggered when the current price is less than 80% of the Graham Number. This indicates a high margin of safety.
Fairly Valued
Occurs when the price sits between 80% and 100% of the fair value. The stock is trading near its conservative intrinsic worth.
Overvalued
Occurs when the current market price exceeds the calculated Graham Number, suggesting limited margin of safety for value investors.
Executing a Value Assessment using the Graham Number Online Tool
Enter Financial Data
Input the company’s most recent annual EPS and BVPS into the respective fields. For example, use $5.00 for EPS and $30.00 for BVPS to simulate a stable value stock.
Input Current Price
Enter the current trading price. If you use a price of $45.00, the tool calculates the fair value and displays the margin of safety percentage.
Review Valuation Status
The tool immediately updates the status text and color-coded indicator, moving from green (undervalued) to red (overvalued).
Utilize Presets
Click the "Value Stock" or "Growth Stock" buttons to instantly populate the fields with representative numbers, helping you understand how different financial profiles affect the calculation.
Reset Analysis
Click the "Reset" button to clear all inputs and return to the default values of $5.00 EPS, $30.00 BVPS, and $60.00 Price.
Example Analysis of a Hypothetical Value Stock
Consider a company with an EPS of $5.00 and a BVPS of $30.00. Using the Graham Number Online calculator, the math is $\sqrt{22.5 \times 5 \times 30} = \sqrt{3375} \approx 58.09$. If this stock is currently trading at $45.00, the calculation is straightforward:
EPS: 5.0, BVPS: 30.0, Price: 45.0Graham Number: $58.09, Margin of Safety: 29.1%, Status: Strong Buy (Undervalued)Best Practices for Applying the Benjamin Graham Fair Value Metric
Investors should prioritize companies with consistent, long-term earnings rather than those experiencing temporary spikes. When using the stock margin of safety tool, always ensure your EPS and BVPS figures are derived from stable periods. If a company has high debt, the book value may be overstated, which can lead to a misleadingly high Graham Number. Always cross-reference this tool's output with qualitative analysis of the company's competitive moat.