Diluted EPS Calculator

Earnings per share (EPS) measures how much of a company’s profit is attributable to each share. Diluted EPS is the conservative version. It assumes every convertible security that could become a share already has.

Basic EPS = (Net Income - Preferred Dividends) / Weighted Average Shares Outstanding

Diluted EPS = (Net Income - Preferred Dividends) / (Weighted Average Shares + Dilutive Securities)

Dilutive securities include stock options, warrants, convertible bonds, and convertible preferred stock. When these instruments are exercised or converted, they increase the share count and shrink the EPS figure.

The dilution percentage shows how much the exercise of all dilutive securities would reduce earnings per share:

Dilution = (Basic EPS - Diluted EPS) / Basic EPS x 100

Why this matters: basic EPS is what you earned on shares already outstanding. Diluted EPS is what you would have earned if everyone who could claim a share already had. For a company with significant employee stock option plans or convertible debt, the gap between the two can be meaningful.

The SEC (Securities and Exchange Commission) requires publicly traded companies to report both figures. Analysts almost always use diluted EPS for valuation, because it is the more conservative and more complete number.

Worked example

Net income $10,000,000, preferred dividends $500,000, 5,000,000 weighted average shares, and 250,000 shares’ worth of options and convertibles outstanding.

Income available to common = $10,000,000 − $500,000 = $9,500,000 Basic EPS = $9,500,000 ÷ 5,000,000 = $1.9000 Diluted EPS = $9,500,000 ÷ 5,250,000 = $1.8095 Dilution = ($1.9000 − $1.8095) ÷ $1.9000 = 4.76%

Under 5% is the range most large companies live in. Past 10% you are looking at a share count that is quietly growing every year, and that growth comes out of your slice, not the company’s.

The loss-year rule catches people out

If income available to common shareholders is zero or negative, every potential share is antidilutive: adding shares to the denominator makes a loss per share look smaller, which is the opposite of conservative. Accounting standards say to exclude them, so in a loss year diluted EPS is reported equal to basic EPS. A company losing $4,000,000 on 5,000,000 shares reports −$0.80 basic and −$0.80 diluted, not the flattering −$0.76 that the raw division would give. This calculator applies that rule for you, and it is the single most common mistake in a spreadsheet-built EPS model.

The same idea applies security by security in the real filings. A convertible bond whose interest, added back to net income, more than offsets the extra shares is antidilutive on its own and gets left out even in a profitable year.

For most analysis, the price-to-earnings (P/E) ratio you see on financial data sites uses diluted EPS.