What this calculator does
A buyback raises earnings per share without the company earning any more, simply by dividing the same profit among fewer shares. Repurchasing 2 million of 20 million shares lifts EPS from $2.50 to $2.78, an 11.1 per cent increase, on unchanged net income.
That is why buybacks are watched closely. They genuinely return capital to shareholders, but they also flatter a headline metric that executive pay is often tied to, and those two things are hard to separate from outside.
The formula
Earnings per share before is net income divided by the original share count. After the repurchase the same income is divided by the reduced count, and the cash used is the number of shares bought times the price paid.
| Term | Meaning |
|---|---|
| Buyback | A company repurchasing its own shares, which reduces the count outstanding. |
| EPS accretion | The increase in earnings per share resulting from the smaller denominator. |
| Cash used | Shares repurchased times the price paid, which leaves the balance sheet permanently. |
The inputs explained
| Field | What to enter |
|---|---|
| Net income ($) | Net income, assumed unchanged by the buyback. |
| Shares outstanding before | Shares outstanding before the repurchase. |
| Shares repurchased | Number of shares repurchased. |
| Price paid per share ($) | The average price paid per share. |
When to use it
Assessing a buyback announcement
The EPS effect is arithmetic and can be worked out the moment the size is announced.
Separating growth from financial engineering
EPS growth driven by a shrinking share count is not the same as earnings growth.
Comparing a buyback with a dividend
Both return capital, but only one changes the per-share figures.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How much does each buyback size lift EPS?
Three repurchase sizes against the same earnings.
| Shares repurchased | EPS after buyback | Cash used for the buyback |
|---|---|---|
| 1m shares | $2.63 | $25,000,000.00 |
| 2m shares | $2.78 | $50,000,000.00 |
| 4m shares | $3.13 | $100,000,000.00 |
Questions
Does a buyback create value?
Only if the shares are bought below what they are worth. Buying overvalued shares transfers value from remaining holders to those who sold, even though EPS still rises. The price paid is what decides it.
Why not just pay a dividend?
Buybacks are more flexible, since they carry no expectation of repetition, and in some jurisdictions they are treated more favourably for tax. Dividends are more transparent and reach every shareholder equally.
Does this calculation ignore anything?
Yes, two things. The cash spent would otherwise have earned a return or reduced debt, and if the buyback is funded by borrowing then interest rises. Both reduce net income, which this simple version holds constant.
Why are buybacks criticised?
Because they raise a metric that executive compensation is frequently linked to, without the business performing any better. Whether a particular buyback is sound depends on whether that cash had a better use.
For the share count EPS actually uses, see the weighted average shares calculator. For the alternative form of return, see the dividend yield and payout calculator.