How the Earnings Per Share Growth Calculator works
Earnings per share (EPS) is a company's net income divided by its weighted average shares outstanding — the profit attributable to a single share of stock. This calculator measures how EPS changed between two periods and expresses that change two ways: as a simple total percentage change, and as an annualized compound growth rate (CAGR) that smooths the change over multiple years.
The formulas
Total EPS growth uses the standard percentage-change formula:
EPS Growth (%) = (Ending EPS − Beginning EPS) ÷ |Beginning EPS| × 100
When you compare EPS across more than one year, the annualized rate is more useful for judging a consistent pace of growth. It uses the compound annual growth rate formula:
CAGR (%) = [(Ending EPS ÷ Beginning EPS)1/n − 1] × 100
where n is the number of years between the beginning and ending EPS figures. CAGR only produces a real number when both EPS figures are positive; if either period shows a net loss (negative EPS), the calculator reports the simple total growth rate but marks CAGR as not applicable.
Worked example
Say a company reported EPS of $2.50 three years ago and $3.25 today. The total growth is ($3.25 − $2.50) ÷ $2.50 × 100 = 30% over the three years. The annualized rate is [(3.25 ÷ 2.50)1/3 − 1] × 100 ≈ 9.14% per year. Projected forward five more years at that same annualized rate, EPS would reach roughly $3.25 × (1.0914)5 ≈ $5.03 — a projection, not a guarantee, since real growth rates rarely hold perfectly steady.
Why the denominator uses absolute value
Dividing by the absolute value of beginning EPS, rather than the raw signed number, keeps the percentage meaningful when a company is turning around from a loss. If beginning EPS were −$1.00 and ending EPS improved to $0.50, dividing by the negative raw value would produce a negative percentage even though the company clearly improved. Using the absolute value produces a positive percentage that correctly reflects the improvement.
What moves EPS growth
- Net income growth: the most direct driver — higher profit relative to the prior period pushes EPS up, all else equal.
- Share count changes: buybacks shrink the share count and can lift EPS even with flat net income; new share issuance dilutes EPS even if net income grows.
- One-time items: asset sales, write-downs, and other non-recurring items can swing EPS in either direction without reflecting the ongoing business trend — many analysts compare adjusted (non-GAAP) EPS for this reason.
Limitations
This calculator computes EPS growth from the figures you enter; it does not source financial statements, adjust for one-time items, or forecast future earnings. The projected EPS figure simply extends the calculated CAGR forward and assumes that rate holds constant, which real companies rarely do exactly. Use it as a starting point for analysis, not as investment advice.