Graham-Buffett Margin of Safety Calculator

📈 The Methodology

Warren Buffett and Benjamin Graham's core principle: Only invest when you're getting more value than you're paying for. This calculator helps you determine if a stock meets their margin of safety criteria.

Fair P/E ≈ 1 ÷ (2 × Risk-Free Rate)

Example: If the 10-year Treasury yield is 4%, then Fair P/E ≈ 1 ÷ (2 × 0.04) = 12.5

Margin of Safety: Buy only when the current price is 20-40% below intrinsic value. If something is worth $100, try to buy it at $60-$80.

📊 Stock Analysis Inputs

Stock Ticker Symbol

Enter the stock symbol you want to analyze

Current Stock Price ($)

Find current price on Yahoo Finance or Google Finance

Earnings Per Share (EPS) - TTM ($)

Use trailing twelve months (TTM) EPS from financial reports

10-Year Treasury Yield (%)

Current 10-year US Treasury yield (risk-free rate)

Target Margin of Safety (%)

Recommended: 20-40% (Graham's preferred range)

📋 Analysis Results

Current P/E Ratio: -

Fair P/E (Graham Method): -

Intrinsic Value per Share: -

Current Margin of Safety: -

Target Buy Price: -

Enter stock data above to see analysis

🔗 Where to Find Your Data

Yahoo Finance - Stock Data Google Finance - Alternative FRED - 10Y Treasury Rate Treasury.gov - Daily Rates SEC EDGAR - Company Filings

📈 Your Investment Scorecard

Ticker	Current Price	EPS (TTM)	Current P/E	Fair P/E	Intrinsic Value	Margin of Safety	Recommendation
Add stocks using the calculator above to build your scorecard