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Calculate stock P/E ratios online to quickly evaluate stock valuations and determine if shares are overvalued or undervalued.
Positive price/EPS or market cap/same-period profit, and E/P arithmetic only. Universal valuation bands and payback forecasts were removed. Match currency and scale; zero/negative earnings are not evaluated. This is not dividend yield or a return forecast.
Calculate P/E ratio using Stock Price ÷ Earnings Per Share (EPS).
Typically uses diluted EPS from the last 12 months (TTM) or most recent fiscal year.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
The price-to-earnings ratio (P/E) compares a company’s share price with earnings per share (EPS). It expresses how many dollars of price correspond to one dollar of earnings under the period and accounting basis represented by the EPS. A P/E of 10 means the price is ten times the entered earnings per share; it does not predict a future return. The basic per-share formula is P/E = share price ÷ EPS. The U.S. Securities and Exchange Commission’s Investor.gov glossary describes this formula and notes that EPS commonly reflects earnings over the previous 12 months.
Use the per-share calculation when you have a share price and EPS for the same company. Use the market-cap calculation when you have that company’s market capitalization and net profit for a matching earnings period. In either method, the numerator and denominator must refer to the same company and compatible periods. The amounts must use the same currency and scale: for example, do not divide a market capitalization stated in millions of dollars by profit stated in dollars without converting one amount.
Both calculations return a multiple. For example, a share price of $50 and EPS of $5 gives 50 ÷ 5 = 10, or 10×. Market capitalization of $1 billion divided by compatible net profit of $100 million also gives 10×. These are arithmetic examples, not live market data.
The result also shows earnings yield, calculated as EPS ÷ share price × 100%, or equivalently 1 ÷ P/E × 100%. At a P/E of 10, earnings yield is 10%. This is an arithmetic relationship between the entered values; it is not a promised return or a cash distribution.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Choose per-share inputs for share price and EPS, or market-cap inputs for market capitalization and net profit.
Use figures for the same company. Match the earnings period to the question you are analyzing, and for market cap calculations use the same currency and amount scale for both values. The calculator does not fetch stock prices or financial statements and does not select a trailing or forecast earnings period for you.
Review the P/E multiple and earnings yield. For example, $50 ÷ $5 produces 10× and a 10% earnings yield. The displayed values are rounded to two decimal places.
Use cases
See how the tool fits into real work and everyday tasks.
Enter the share price and reported EPS used in a published calculation. Confirm that the report’s period and EPS basis match your inputs, then compare the resulting multiple with the stated figure.
Hold the price constant and calculate again with a different EPS period. The changed result shows how sensitive the multiple is to the earnings figure; label each period so that trailing and forecast figures are not mistaken for one another.
When reviewing company-level figures, enter market capitalization and profit for the same company and period. First convert amounts to a shared currency and scale, then use the multiple as a calculation check.
Q&A
Find concise answers to common questions and confusing cases.
No. Enter both figures yourself. The result reflects only the values provided and is not a live quote or financial-data lookup.
The calculator has no period selector. You can calculate a ratio using a trailing or forecast EPS value that you supply, but the result does not identify which basis you used. Keep the period label with your notes and compare like with like.
The calculator accepts only positive numerator and denominator values. A zero denominator cannot produce a finite ratio, and this tool does not assign a P/E value to zero or loss-making earnings. Use a different analysis approach for a company without positive earnings.
Notes
Review scope, result limitations, and important precautions before use.
A P/E calculation is only as comparable as its inputs. Earnings periods, accounting treatment, diluted versus basic EPS, and one-time items can affect the denominator. Market capitalization and net profit must also cover the same company and compatible period. The calculator does not supply a standard for deciding whether a P/E is cheap, expensive, or appropriate for a particular company; avoid treating a single multiple as a valuation conclusion. Earnings yield is not an investment return forecast. The result is a mathematical reference, not investment advice.
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