What P/E means

P/E — Price-to-Earnings — is the most quoted valuation ratio there is: how many rupees is the market charging for every rupee of a company’s annual earnings? Framed differently, it’s roughly how many years of current profit an investor is paying for at today’s price.

The formula

P/E = Price per Share / EPS

This series always uses diluted EPS — the last post showed exactly why that matters.

Worked example: Desi Bites Foods Ltd

   
IPO Price ₹640
÷ Diluted EPS ₹16.72
P/E 38.3x

Worth seeing the mistake explicitly: had we used undiluted EPS (₹20.9) instead, P/E would come out to 30.6x — a materially different, and wrong, number for a stock that just diluted its share count via a fresh issue.

Worked example: Britannia Industries

Price is Britannia’s NSE closing price on 30 June 2025 (source: Yahoo Finance historical data), paired with the FY25 EPS from the audited consolidated results — i.e. roughly what the market was paying for Britannia’s FY25 earnings shortly after those results were digested. For illustration only, not a signal to act on.

   
Price (30 June 2025) ₹5,851.0
÷ EPS ₹90.45
P/E 64.7x

A P/E of 64.7x means the market was pricing Britannia at roughly 64.7 years of its FY25 earnings. That’s a rich multiple — but not an irrational one for a company that, across this whole series, has shown ROE above 50%, negative net debt, and a negative cash conversion cycle. A high P/E is what a market paying up for genuine, demonstrated quality looks like — whether 64.7x specifically is a good price to pay for that quality is a separate question this series deliberately doesn’t answer.

Common mistakes

  • Treating high P/E as automatically overvalued, or low P/E as automatically cheap. Both readings skip the actual question: is the multiple justified by the quality and durability of the earnings behind it? A “cheap” P/E on a deteriorating business can be far riskier than an “expensive” one on a genuinely strong one.
  • Mixing trailing and forward EPS without checking which is being used. This series always uses trailing (historical, already-reported) EPS — some sources quote forward (analyst-estimated) EPS instead, which produces a different P/E for the same price.
  • Comparing P/E across industries or growth profiles without context. A slow-growing utility and a fast-growing FMCG brand can both have “reasonable” P/Es that mean completely different things.
  • Ignoring earnings quality behind the E. A great P/E on paper means little if the earnings themselves aren’t backed by real cash — worth checking OCF/PAT before trusting a P/E at face value.

Takeaway: P/E measures how many years of current earnings the market is charging for a share — useful as a starting comparison, but it only means something once it’s read alongside the quality and growth of the earnings underneath it, not as a number that’s simply “high” or “low” in isolation.