What is earnings per share (EPS)?

Earnings per share (EPS) is the portion of a company's profit allocated to each outstanding share of common stock. It is one of the most widely used measures of a company's profitability. For example, a company with net income of $5,000,000, preferred dividends of $500,000, and 2,000,000 weighted average shares outstanding has EPS of $2.25: ($5,000,000 − $500,000) ÷ 2,000,000.

What is the formula for basic EPS?

Basic EPS = (Net Income − Preferred Dividends) ÷ Weighted Average Common Shares Outstanding. Preferred dividends are subtracted because they belong to preferred shareholders, not common shareholders. Using the verified example: ($5,000,000 − $500,000) ÷ 2,000,000 = $2.25 per share.

What are weighted average shares outstanding (WASO)?

Weighted average shares outstanding time-weights each share count by how long it was outstanding during the period. Example: 1,000,000 shares outstanding all 12 months plus 200,000 new shares outstanding for 6 months gives 1,000,000 × 12/12 + 200,000 × 6/12 = 1,100,000 weighted average shares. Using time-weighting keeps EPS comparable across periods when share counts change.

Diluted EPS shows the worst-case per-share earnings if all dilutive securities (stock options, RSUs, warrants, convertibles) were exercised or converted. It uses a larger share count than basic EPS, so diluted EPS is normally equal to or lower than basic EPS. With 2,000,000 basic shares plus 25,000 dilutive shares, diluted EPS = $4,500,000 ÷ 2,025,000 = $2.22, slightly below the basic $2.25.

What is the treasury stock method?

The treasury stock method estimates how many extra shares stock options add. Assumed proceeds from exercising the options are used to buy back shares at the average market price, and only the net new shares count. Example: 50,000 options with a $10 exercise price and a $20 average market price add 50,000 − 50,000 × $10/$20 = 25,000 shares. Options whose exercise price is at or above the market price are out-of-the-money and add zero shares.

Why does diluted EPS equal basic EPS when a company loses money?

Because of the anti-dilutive guard required by accounting standards. If the company reports a loss, including dilutive shares would shrink the loss per share and make results look better than they are, which is misleading. So diluted EPS is reported equal to basic EPS. Example: a $100,000 net loss over 2,000,000 shares gives basic and diluted EPS of −$0.05.

How do you calculate the P/E ratio from EPS?

The price-to-earnings ratio is P/E = Share Price ÷ EPS. It tells you how much investors pay for each dollar of earnings. Using the verified example, a $45 share price and EPS of $2.25 gives P/E = 45 ÷ 2.25 = 20×, meaning investors pay $20 for every $1 of annual earnings.

How do you calculate EPS growth year over year?

Year-over-year EPS growth = (Current EPS − Prior EPS) ÷ |Prior EPS| × 100%. Example: EPS rising from $1.80 to $2.25 is ($2.25 − $1.80) ÷ $1.80 × 100% = +25.0%. Using the absolute value of prior EPS keeps the sign correct when the prior period was a loss.

Is a higher EPS always better?

Not necessarily. EPS can rise because of share buybacks even when total profit is flat, and it says nothing about debt, cash flow, or whether earnings are sustainable. A $2.25 EPS from growing revenue is very different from $2.25 EPS engineered by shrinking the share count. Always read EPS together with revenue growth, margins, cash flow, and the balance sheet.

Basic EPS vs diluted EPS: which should investors use?

Analysts generally focus on diluted EPS because it is the more conservative measure — it reflects the earnings power after all potential dilution. Basic EPS is the starting point and matches what appears most prominently in many headlines. When the two differ a lot, the gap itself is informative: it shows how much future dilution is embedded in employee stock plans and convertibles.

Can EPS be negative or zero?

Yes. A net loss produces negative EPS, and the diluted figure is then pinned to the basic figure by the anti-dilutive guard. EPS can also be exactly zero when preferred dividends fully absorb net income — for example, $5,000,000 of net income with $5,000,000 of preferred dividends over 2,000,000 shares gives EPS of $0.00.

Is this EPS calculator financial advice?

No. This calculator is an educational tool that performs the standard arithmetic for basic EPS, diluted EPS via the treasury stock method, the P/E ratio, and year-over-year EPS growth. It is not financial, investment, or tax advice, and its output should not be the sole basis for any investment decision. For decisions involving real money, consult a qualified financial professional.

EPS Calculator — Earnings Per Share

Basic EPS, time-weighted shares outstanding, diluted EPS via the treasury stock method, the P/E ratio, and year-over-year EPS growth — all with step-by-step workings.

Educational tool only — not financial advice

Financial disclaimer: This calculator performs standard EPS arithmetic for education and illustration. It is not financial, investment, or tax advice. Do not base investment decisions on its output alone — consult a qualified financial professional.

1 · Basic EPS

Net income (company profit for the period) After all expenses and taxes, before preferred dividends. Example: 5000000 Preferred dividends Paid to preferred shareholders; subtracted from net income. Enter 0 if none. Shares outstanding

Weighted average common shares outstanding The time-weighted share count for the period. Example: 2000000

2 · Diluted EPS — treasury stock method (optional)

Enter each tranche of stock options / RSUs / warrants. Out-of-the-money tranches add zero shares automatically.

3 · P/E ratio & YoY growth (optional)

Current share price Example: 45

EPS, prior period For year-over-year growth. Example: 1.80

Results

Basic EPS

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Diluted EPS

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P/E ratio

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YoY EPS growth

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Reminder: EPS is one profitability metric among many. It does not reflect debt, cash flow, or earnings quality, and buybacks can raise EPS without profit growth. Not financial advice.

Methodology

Metric	Formula
Basic EPS	(Net income − Preferred dividends) ÷ Weighted average shares
Time-weighted WASO	Σ shares × (months outstanding ÷ months in period)
Treasury stock method	Added shares = Options − Options × Exercise price ÷ Avg market price
Diluted EPS	(Net income − Preferred dividends) ÷ (WASO + dilutive shares); on a loss, diluted = basic (anti-dilutive guard)
P/E ratio	Share price ÷ EPS
YoY EPS growth	(Current EPS − Prior EPS) ÷ \|Prior EPS\| × 100%

Frequently asked questions

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EPS Calculator — Earnings Per Share

1 · Basic EPS

2 · Diluted EPS — treasury stock method (optional)

3 · P/E ratio & YoY growth (optional)

Results

Methodology

Frequently asked questions

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1 · Basic EPS

2 · Diluted EPS — treasury stock method (optional)

3 · P/E ratio & YoY growth (optional)

Results

Methodology

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