ROI Calculator
Measure the return on an investment as a percentage of what you put in. Free, no signup.
Scan to open on your phone
Point your phone camera at the code to open this tool.
Measure the return on an investment as a percentage of what you put in. Free, no signup.
How to use ROI Calculator
- Open the toolNo signup and nothing to install; it works as soon as the page loads.
- Set “Amount invested”
- Set “Amount returned”
- Read the resultChange any input and the result is recalculated immediately.
Worked example with the defaults
- RETURN ON INVESTMENT · $200.00 profit on $1,000
- 20.0%
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
ROI Calculator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- What is a good ROI?
- It depends on the risk, but it is always measured against the return you could earn elsewhere for similar risk.
- Does ROI include time?
- No. Plain ROI ignores how long the money was invested; use CAGR when time matters.