Stock valuation · Income statement
Earnings Per Share (EPS): Formula, Calculation & What It Means
Earnings per share is the denominator behind the P/E ratio, the input to every earnings-based valuation model, and the number Wall Street watches every quarter. Understanding what EPS actually measures — and the difference between basic and diluted — is essential before using it in any valuation.
Earnings per share (EPS) measures how much net income a company generated for each share of common stock outstanding. EPS = Net Income available to common shareholders / Weighted average shares outstanding. Always use diluted EPS for valuation — it includes the dilutive effect of stock options, warrants, and convertibles. Apple (AAPL) FY2024: $93.7B net income / 15.3B diluted shares = $6.11 diluted EPS.
Basic vs. Diluted EPS
Companies report two EPS figures. Basic EPS uses the actual shares outstanding. Diluted EPS expands the denominator to include all potential shares that could be created from options, warrants, convertible debt, and restricted stock units — giving a more conservative, investor-relevant number.
| Basic EPS | Diluted EPS | |
|---|---|---|
| Denominator | Actual weighted average shares | Shares + dilutive options, warrants, convertibles |
| Result vs Basic | Higher (smaller denominator) | Lower or equal (larger denominator) |
| Use for valuation? | No — overstates earnings power | Yes — the standard for P/E and DCF |
| Where reported | Income statement (bottom) | Income statement (bottom, below basic) |
For a tech company with large equity compensation programs, the gap between basic and diluted EPS can be meaningful. Always use diluted EPS when calculating P/E or any per-share valuation metric.
Apple (AAPL) FY2024 Worked Example
Apple’s FY2024 income statement illustrates the full EPS calculation from net income down to diluted EPS. Here is the step-by-step breakdown using approximate FY2024 numbers.
- Step 1: AAPL FY2024 net income
- $93.7B
- Step 2: Less preferred dividends (none for AAPL)
- $0
- Step 3: Net income available to common shareholders
- $93.7B
- Step 4: Weighted average diluted shares outstanding
- 15.3B
- Diluted EPS: $93.7B / 15.3B
- $6.11
AAPL’s diluted share count is lower than its basic share count because the company aggressively buys back stock. Persistent buybacks reduce the weighted average share count year over year, lifting EPS even in periods of flat net income — a dynamic that matters for EPS growth analysis.
EPS and the P/E Ratio
EPS is the denominator in the P/E formula — see our P/E ratio guide for the full framework. The relationship is direct: P/E = Stock Price / Diluted EPS. A higher EPS for the same stock price means a lower (cheaper) P/E multiple.
- AAPL stock price (approximate)
- $230
- AAPL diluted EPS (FY2024)
- $6.11
- Trailing P/E: $230 / $6.11
- 37.6×
At 37.6×, investors are paying roughly $37.60 for every $1 of AAPL’s annual earnings. Whether that is cheap or expensive depends on earnings growth expectations, sector peers, and interest rate context. Use the P/E calculator to compute this live for any ticker and compare against sector medians.
EPS Growth Rate
EPS growth measures the year-over-year percentage change in diluted EPS. It is one of the most-watched metrics in quarterly earnings season, and it directly feeds the PEG ratio (P/E divided by EPS growth rate).
EPS Growth Rate = (EPScurrent − EPSprior) / |EPSprior| × 100%. For AAPL: if FY2024 diluted EPS was $6.11 and FY2023 diluted EPS was $6.13, YoY growth was approximately −0.3% — nearly flat. Compare that to revenue growth of ~2% and it shows margin pressure was modest.
Sustained double-digit EPS growth, especially alongside revenue growth, is a strong signal of operating leverage. EPS growth driven purely by buybacks deserves more scrutiny — the earnings base is not expanding, only the per-share slice. See the EPS growth by industry benchmarks to compare a company’s growth rate against its sector peers.
What Drives EPS: Three Levers
EPS has three primary drivers. Understanding which lever is operating tells you whether EPS improvement is genuinely good news or a financial engineering artifact.
- Revenue growth. More top-line revenue, holding margins constant, flows directly to higher net income and higher EPS. This is the highest-quality EPS driver because it reflects genuine business expansion rather than financial engineering.
- Margin expansion. Gross margin, operating margin, and net margin improvements mean more earnings reach the bottom line from the same revenue base. A company growing revenue 5% and expanding net margin from 15% to 18% will see EPS grow faster than revenue — this is operating leverage in action.
- Share buybacks. Reducing the share count mechanically lifts EPS even without any improvement in the underlying business. A company that earns $1B and has 100M shares has $10 EPS. Buy back 10M shares and EPS rises to $11.11 with no change in earnings. This can be genuinely value-creating (if shares are bought below intrinsic value) or value-neutral/destructive (if management buys at inflated prices or foregoes better reinvestment opportunities). Always look for EPS growth accompanied by revenue and earnings growth, not just share count reduction.
Adjusted vs. GAAP EPS
Companies routinely report both GAAP EPS (based on generally accepted accounting principles) and adjusted (non-GAAP) EPS. Adjusted EPS strips out items management deems one-time or non-cash: restructuring charges, stock-based compensation, acquisition-related amortization, legal settlements, and similar items.
Adjusted EPS is almost always higher than GAAP EPS. Analysts and investors often use adjusted EPS for trend analysis because it smooths out noise — but it can also obscure real costs. Stock-based compensation, for instance, is a real economic cost that comes out of shareholders’ pockets via dilution, even though it is a non-cash line on the income statement.
The safest approach: track both, reconcile the difference, and understand why the two diverge. A company where adjusted EPS consistently exceeds GAAP EPS by 20%+ deserves scrutiny about whether the “one-time” items are actually recurring. See GAAP vs. adjusted earnings for a full breakdown of the common adjustments and red flags.