How to Tell if a Stock Is Overvalued or Undervalued (2026 Guide)
A practical, no-jargon framework for deciding whether a stock is overvalued or undervalued — using P/E, DCF, free cash flow and a margin of safety, with free tools to do the math for you.
Price is not value
Three lenses that reveal over/undervaluation
Always demand a margin of safety
Cheap for a reason? Check the story
Put it into practice
Signs a stock may be overvalued
Signs a stock may be undervalued
A 60-second checklist
Common questions
Try it on a stock: Apple Inc. (AAPL) · MICROSOFT CORP (MSFT) · Alphabet Inc. (GOOGL) · NVIDIA CORP (NVDA) · AMAZON COM INC (AMZN) · Tesla, Inc. (TSLA) · Meta Platforms, Inc. (META)