The formula
Worked example
Here is the calculation with the starting values:
- Net income: 48,000,000
- Preferred dividends: 3,000,000
- Shares outstanding: 15,000,000
That gives:
- Earnings per share: 3
- Earnings available to ordinary shares: 45,000,000
- Preferred takes: 6.25 %
Reading the result
EPS is only comparable to the same company's history. Across companies it is meaningless on its own — a £10 EPS is not better than a £1 EPS, it just means fewer shares exist. Growth in EPS is what carries information.
Where this goes wrong. Buybacks flatter EPS without the business improving. If profit is flat and the share count falls 8%, EPS rises 8% — real for a shareholder, but not the same as growth in earnings.
Basic uses the shares in issue. Diluted assumes every option, convertible bond and share award that could become an ordinary share has done so. Diluted is the more conservative number and the one worth using.
Yes, when a company makes a loss. Negative EPS makes the price/earnings ratio meaningless, which is why loss-making companies are valued on revenue multiples or cash flow instead.
The answer it gives you is earnings per share. With 48,000,000 net income, 3,000,000 preferred dividends and 15,000,000 shares outstanding, that comes to 3. Change any field and the figure moves with it.