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P/E ratio meaning in simple words: price compared with profit

The Plainomics desk1 source

P/E ratio: the share price divided by the profit per share: how many rupees buyers pay today for each rupee the company earns in a year.

Sameer slumps on the red stool frowning at his phone while Riya sits on the counter edge cheering him up.

The story

two people, one chai stall

A stock-tips channel calls Sameer Chai "too costly at a P/E of 30". Sameer looks hurt.

Sameer

Costly? Our share is only ₹54.

Riya

P/E doesn't care about the price alone. It compares the price with the profit behind each share.

Sameer

Which is?

Riya

₹9 crore of profit over 5 crore shares. That's ₹1.80 a share. ₹54 divided by ₹1.80 is 30.

Sameer

So people pay ₹30 for every ₹1 we earn in a year?

Riya

Exactly. Another way to see it: at today's profit, it would take 30 years of earnings to add up to the price.

Sameer

That sounds like a lot of patience.

Riya

It means buyers expect the profit to grow. If we open more stalls and profit doubles, the same ₹54 price is a P/E of 15.

Sameer

And if profit falls?

Riya

Then 30 starts to look expensive, and the price usually falls to match.

The grown-up version

same idea, exact words

The price-to-earnings (P/E) ratio is the market price of a share divided by its earnings per share (EPS), usually basic EPS for the latest twelve months or financial year. A trailing P/E uses reported earnings; a forward P/E uses forecasts. It is a market measure, not an accounting one, so it changes every time the price moves, and it means little when earnings are very small or negative.

Formula

P/E = Market price per share ÷ Earnings per share

Which rule asks for itNo law defines or caps it. EPS, its input, is calculated under Ind AS 33 (Earnings per Share). In an IPO, the SEBI (ICDR) Regulations, 2018 require the 'Basis for Issue Price' section of the offer document to show the issuer's P/E at the issue price and the industry P/E (Schedule VI, Part A, item (9)(K)).

Spot it in the wild

a real annual report, a real page

TCS ten-year ratio table, with EPS of ₹145.99 and a year-end P/E of 16.2 circled
Found it: p.100Tata Consultancy Services Ltd · Integrated Annual Report 2025-26
  1. P/E at the year end: 16.2 times, down from 26.9 a year earlier.
  2. The E in P/E: ₹145.99 of profit per share. The price was about 16 times this.

Don't mix it up

the usual confusions

  • P/E ratio ≠ EPS

    EPS is the profit per share: ₹1.80 for Sameer Chai. P/E compares the share price with it: ₹54 ÷ ₹1.80 = 30.

  • P/E ratio ≠ P/B ratio

    P/B compares the price with book value per share (what the books say each share owns). Sameer Chai: ₹54 ÷ ₹22, about 2.5.

  • P/E ratio ≠ cheap share

    A low share price isn't a low P/E. A ₹54 share can be pricier, compared with its profit, than a ₹5,000 one.

Three quick sips

no sign-up, nothing saved

1/3 Sameer Chai's EPS is ₹1.80 and the price is ₹54. What is the P/E?

Hindi mein

पी/ई रेशियो (प्राइस-टू-अर्निंग्स)

पी/ई रेशियो शेयर के भाव को प्रति शेयर मुनाफ़े से भाग देकर निकलता है: कंपनी की एक साल की हर ₹1 कमाई के लिए ख़रीदार आज कितने रुपये दे रहे हैं।

Sources

  1. SEBI (Issue of Capital and Disclosure Requirements) Regulations, 2018 (amended up to 21 March 2026), SEBI