ROI Calculator

Amount invested Amount returned Investment length (years)

Gain / loss $0.00

ROI 0%

Annualized ROI 0%

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Free ROI calculator showing both simple ROI and annualized ROI — the more meaningful figure for comparing investments held for different lengths of time.

This tool is for informational purposes only and is not a substitute for professional financial or medical advice. Consult a qualified professional before making decisions. See our Disclaimer.

How it works

Enter the amount invested and the amount returned
Add how long you held the investment
See your gain, simple ROI%, and annualized ROI% instantly

Frequently asked questions

Why does annualized ROI matter if I already know my ROI%?

A 50% ROI over 1 year and a 50% ROI over 5 years are very different results — annualized ROI converts both to a comparable "per year" rate so you can actually compare investments of different lengths.

Does this handle multiple contributions or withdrawals over time?

No — this tool is for a single initial investment and a single final value. For multiple cash flows over time, use our IRR Calculator instead.

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From the blog

finance-calc

A 50% return over 1 year and a 50% return over 5 years are not the same investment

Simple ROI treats them identically. Annualized ROI — which not every calculator bothers to compute — tells you which one actually performed better per year.

2026-09-01

Update history

2026-09-01 Added: a cover image (a small potted plant sprouting from a coin, beside a percentage sign) — used as the card thumbnail, social share image, and blog title image.
2026-09-01 Launched: ROI calculator (no button) — simple ROI and annualized ROI from an investment amount, return amount, and holding period. Entirely client-side.