# ROI Calculator — Return on Investment

Calculate return on investment (ROI) and net return from a cost and final value, with optional annualized ROI. 100% in your browser — free, no sign-up.

## What ROI tells you

Return on investment (ROI) measures how much you gained relative to what you put in, as a percentage. It lets you compare investments of different sizes on the same scale — a 50 profit on 100 (50% ROI) beats a 50 profit on 500 (10% ROI).

## How it works

Enter the amount invested (cost) and the final value or total return; it shows your net return and ROI instantly in your browser. Add a number of years to also see the annualized ROI, which is more comparable across investments of different lengths.

## The formula

ROI = (final value − cost) ÷ cost × 100. Example: cost 1,000, final value 1,300 → net 300, ROI 30%. Annualized ROI = ((final ÷ cost)^(1 ÷ years) − 1) × 100, which spreads the total return evenly across the years to give a per-year rate.

## What ROI leaves out

Basic ROI ignores time (unless you annualize), and it does not account for risk, taxes, fees, or inflation. Use it as a quick comparison, not a full financial picture — two investments with the same ROI can differ a lot in risk and timing.

## How to

1. Enter the amount invested (cost).
2. Enter the final value or total return.
3. Optionally add years for annualized ROI, then read the results.

## FAQ

**What is the ROI formula?**

ROI = (final value − cost) ÷ cost × 100. E.g. cost 1,000, final 1,300 → 30% ROI.

**What is annualized ROI?**

It spreads the total return across the years: ((final ÷ cost)^(1 ÷ years) − 1) × 100 — more comparable across investments of different lengths.

**What does ROI not account for?**

Basic ROI ignores time (unless annualized), risk, taxes, fees, and inflation. Use it as a quick comparison, not a full picture.

**Is it free?**

Yes, completely free — no sign-up and no watermark.

**Is my data private?**

Yes — this tool runs entirely in your browser. Your files and text are never uploaded.


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