The Margin of Safety Calculator is a free web-based tool that helps individual investors determine the true intrinsic value of stocks before they buy. Built on the time-tested Margin of Safety investing framework popularized by Phil Town, the calculator walks you through a step-by-step valuation process so you can make confident, informed decisions about every stock in your portfolio.

The app is designed for everyday investors — from beginners learning how to value companies for the first time to experienced traders who want a quick, reliable second opinion on a stock's fair price. Instead of relying on gut feelings or Wall Street hype, you enter a stock symbol and the calculator fetches live financial data — including earnings per share, growth rates, and analyst estimates — then helps you calculate a sticker price and a safe buy price with a built-in margin of safety.

Key features include an interactive calculator with adjustable assumptions for growth rate, PE ratio, and desired return rate; a personal watchlist to track stocks you're interested in; a portfolio tracker that monitors your positions with live pricing and annualized return comparisons against the S&P 500; and price alerts that notify you when a stock hits your target. The app also provides detailed financials, company profiles, and analyst estimates all in one place.

The Margin of Safety Calculator is built and maintained by an independent team of investing enthusiasts and software developers who believe that sound valuation principles should be accessible to everyone. We are not financial advisors, and nothing on this site constitutes investment advice — always do your own research and consult a licensed professional before making investment decisions.