IRR vs P/E
IRR (Internal Rate of Return) and P/E (Price-to-Earnings Ratio) both come up in business conversations and get confused. Here's the plain-English difference, side by side, so you can use each one with confidence.
The key difference: IRR refers to internal rate of return, while P/E refers to price-to-earnings ratio — they describe different things even when they show up in the same sentence.
IRR — Internal Rate of Return
The annualized return rate that makes an investment's NPV equal to zero. Used to compare investments on a like-for-like basis.
P/E — Price-to-Earnings Ratio
A company's stock price divided by its earnings per share. P/E is the most common quick valuation multiple.
When to use IRR
Reach for "IRR" when the conversation is specifically about internal rate of return. The annualized return rate that makes an investment's NPV equal to zero. Used to compare investments on a like-for-like basis.
When to use P/E
Reach for "P/E" when the conversation is specifically about price-to-earnings ratio. A company's stock price divided by its earnings per share. P/E is the most common quick valuation multiple.
FAQs
What is the difference between IRR and P/E?
IRR stands for Internal Rate of Return — The annualized return rate that makes an investment's NPV equal to zero. Used to compare investments on a like-for-like basis. P/E stands for Price-to-Earnings Ratio — A company's stock price divided by its earnings per share. P/E is the most common quick valuation multiple.
Are IRR and P/E the same thing?
No. They're often used in the same conversation because they're related, but they describe different concepts. IRR = Internal Rate of Return. P/E = Price-to-Earnings Ratio.
When should I use IRR vs P/E?
Use IRR when you're specifically referring to internal rate of return. Use P/E when the topic is price-to-earnings ratio.