Calculator
Price-to-Earnings (P/E) Ratio Calculator
Price-to-Earnings (P/E) Ratio Calculator
Price-to-Earnings (P/E) Ratio
20.0×
Valuation Analysis
The stock trades at 20.0× trailing earnings, roughly in line with the 20× sector average (+0%). Its earnings yield is 5.00%, and at 8% growth the forward P/E drops to 18.5×.
*P/E ratios are valuation heuristics, not buy/sell recommendations. Earnings can be distorted by one-time items, accounting choices, or negative growth. Do your own research or consult a qualified financial adviser.
What Does the P/E Ratio Tell You?
The price-to-earnings ratio is the number of dollars the market pays for every dollar of a company's annual earnings. A stock at $120 earning $6 per share trades at 20× earnings — the market is pricing in 20 years of current earnings per share, or equivalently the stock is offering a 5% earnings yield. It is the most widely used valuation metric in equity markets, appearing on every stock screen, brokerage quote and index summary. The power of the P/E ratio is comparability. Because it normalises price by earnings, you can compare a $5 stock and a $2,000 stock directly. The ASX 200 has traded at a long-run average P/E near 14–16×, while high-growth technology names routinely command 30× or more and cyclical miners can drop to single digits at commodity peaks — a trap in itself, since those are earnings that do not last. Value investors look for stocks trading well below sector averages; growth investors pay up for rapid earnings expansion. Both approaches use the same ratio — the disagreement is about how much growth is worth. This calculator computes the trailing P/E, the forward P/E given a growth assumption, and the PEG ratio that marries valuation to growth expectations.
The Math Behind the P/E Ratio
The trailing P/E is computed as Share Price ÷ Earnings per Share (EPS), where EPS is the trailing twelve months of net profit after tax divided by shares outstanding. A price of $120 and EPS of $6 gives 20×. The inverse of the P/E — earnings yield — expresses the same information as 1/PE × 100, so a 20× stock yields 5% in earnings terms. Australian investors can take the comparison one step further than most: add franking credits to the yield before measuring it against term deposits or bond yields, because a fully franked 5% earnings yield carries roughly 7.1% of grossed-up income for a super fund paying no tax. The forward P/E uses next year's expected earnings: price ÷ (EPS × (1 + growth rate)). If EPS grows 8%, the $6 EPS stock earns an expected $6.48 next year, giving a forward P/E of about 18.5× at a $120 price. The PEG ratio divides the P/E by the expected growth rate (PEG = PE ÷ growth %), and a PEG near 1 is a classic threshold for 'fairly valued relative to growth.' The calculator also compares your P/E against a sector average you provide and computes an implied fair value — the price the stock would trade at if the market applied the sector multiple to current earnings.
Expert Insights
Trailing P/E Lies After Big Events
Trailing EPS includes one-time charges, impairments and commodity-cycle swings that make a single year unrepresentative. After an earnings collapse, P/Es spike to absurd levels that overstate cheapness; after a boom, miner P/Es fall to single digits that understate fragility. Always check earnings quality and cross-reference with broker consensus and statutory-versus-underlying profit before drawing conclusions from trailing figures.
Multiple Expansion Drives Most Bull-Market Gains
Stock returns come from earnings growth plus multiple expansion. The ASX 200's rise from crisis troughs near 11× to sustained readings above 18× has added trillions to index value without any matching earnings increase. Understanding what drives the multiple — the RBA cash rate, bond yields, sentiment, risk appetite — matters more than memorising today's number.
Compare Against the Sector, Not the Whole Market
A 12× P/E looks cheap next to an 18× market average, but energy and resources stocks routinely trade at 8–12× through the cycle. The correct comparison is your stock versus its sector peers. A 15× healthcare stock is a value relative to a 22× sector, but expensive against a 10× banking sector. Set the sector-average input to reflect the company's true peers.
Actionable Tips
- 1
Verify the Source of Earnings Before You Trust the Ratio
Check whether EPS comes from core operations — read the income statement for one-time items, impairments and accounting adjustments, and compare statutory NPAT with the 'underlying' figure companies prefer to quote. Adjusted EPS can flatter the number. If you cannot explain how the company earns money, no valuation ratio makes it safe.
- 2
Use the Forward P/E to Pressure-Test Growth
The gap between trailing and forward P/E is the market's growth assumption. If the trailing is 35× and forward is 28×, the market expects roughly 25% earnings growth. Check broker estimates and ask whether the company can realistically sustain that pace. If growth disappoints, the multiple contracts — often faster than the earnings miss.
- 3
Track the Multiple Over Time, Not in Isolation
A stock trading at 18× is unremarkable unless its five-year average has been 14×. Historical range matters: buying near the high end of a stock's multiple range leaves little room for expansion and plenty of room to fall. Free charting tools and brokerage platforms display historical P/E bands for most ASX names.
Real-World Examples
Jordan Bought the Sector Laggard
Jordan noticed a regional bank trading at 9.5× earnings versus 11× for its peers. After confirming the loan book was sound, he calculated that a move back to the sector multiple would produce 15% upside before any earnings growth. The stock's P/E re-rated to 10.8× within eighteen months, producing most of his expected return — a textbook value multiple expansion.
Priya Avoided the High-Multiple Trap
A technology company Priya followed traded at 68× trailing earnings. The forward P/E of 41× implied 65% growth was priced in. She passed when the stock hit $210. When growth slowed to 30%, the multiple collapsed to 25× and the stock fell 55% — even though earnings still grew. The lesson: a high P/E does not mean 'expensive' in absolute terms, but it means the bar for earnings is set very high.
Marcus Used PEG to Judge Two Miners
Marcus compared two resources stocks: one at 10× peak-cycle earnings growing output 15% a year (PEG 0.7) and another at 18× with flat volumes (PEG 1.8). The PEG exposed how much richer the second was for its growth. He sized his position accordingly and the cheaper stock outperformed over the next two years as iron ore and coal prices normalised and the expensive name's earnings fell back toward its multiple.
Glossary of Terms
- Price-to-Earnings (P/E) Ratio
- Share price divided by earnings per share. Expresses how many dollars the market pays for each dollar of current earnings.
- Forward P/E
- Current share price divided by next year's expected earnings per share. Reflects market expectations rather than historical results.
- PEG Ratio
- P/E ratio divided by the expected earnings growth rate (in percent). A PEG near 1 suggests the valuation is reasonable given growth expectations.
Frequently Asked Questions
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Ivy Sinclair-Wren
Financial Chaos Analyst
Ivy Sinclair-Wren is a Financial Chaos Analyst covering investing, AI, wealth psychology, and the emotional consequences of opening finance apps during market crashes. Based in Melbourne, she specializes in demystifying the Australian tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.