“I made 35% on that investment” sounds impressive — until you find out it took eight years. Total return on its own is missing the one piece of context that actually lets you judge whether an investment performed well: time.
Our ROI Calculator fixes that by computing two numbers side by side: the raw ROI percentage, and the annualized return (CAGR) that accounts for how long your money was actually tied up.
The two numbers, and why you need both
Total ROI answers “how much did I gain or lose, in total, as a percentage of what I put in?” It’s simple: (final value − initial value) / initial value × 100. Put in $10,000, end up with $13,500, and your total ROI is 35%. Clean, easy, but incomplete.
CAGR (Compound Annual Growth Rate) answers a different question: “what constant yearly growth rate would have produced this same result?” For that same $10,000 → $13,500 over 3 years, the CAGR works out to about 10.52% per year — noticeably less than 35% ÷ 3 = 11.67%, because CAGR properly accounts for compounding (each year’s gain builds on the previous year’s already-larger balance, not the original principal).
Why this matters for comparing investments
Say you have two investments: Investment A returned 35% total over 3 years, and Investment B returned 50% total over 6 years. Which performed better per year? Total ROI alone can’t tell you — but converting both to CAGR gives you an apples-to-apples comparison: A’s CAGR is ~10.52%, B’s is ~7.0%. A actually performed better annually, despite B’s higher total number, because B took twice as long to get there.
What it doesn’t do
This tool intentionally stays in “pure math” territory — it doesn’t touch taxes, fees, dividends reinvestment schedules, or inflation. If you want an after-tax or inflation-adjusted figure, subtract those costs from your final value before you enter it. And it works for any asset class where you can define a clean start value, end value, and holding period — stocks, real estate, a business sale, or anything else — not just brokerage accounts.
Try it yourself: ROI Calculator.