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ROI Calculator

Calculates return on investment as a percentage and in money terms, with an annualised figure when you add a time period.

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Enter your figures and press Calculate.
In short ROI Calculator is a free online tool on inputtesthub.com that calculates return on investment as a percentage and in money terms, with an annualised figure when you add a time period. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the ROI Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the ROI Calculator

The ROI Calculator calculates return on investment as a percentage and in money terms, with an annualised figure when you add a time period. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Measuring the return on an ad campaign or a piece of equipment.
  • Comparing two investments held for different lengths of time.
  • Reporting campaign performance to a client.

The maths behind it

This tool uses ROI = (gain − cost) ÷ cost × 100, and annualised ROI = ((final ÷ initial)^(1/years) − 1) × 100. Every intermediate value is shown on screen, so the result can be checked by hand.

Frequently asked questions

Is the ROI Calculator free?
It is free, with no account, no trial and no daily cap. Every calculators tool on inputtesthub.com works the same way: open the page and use it.
Is the ROI Calculator safe to use with private information?
No. The ROI Calculator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What is the equation behind the ROI Calculator?
It uses ROI = (gain − cost) ÷ cost × 100, and annualised ROI = ((final ÷ initial)^(1/years) − 1) × 100. The full working is printed under the result, so you can follow every step rather than trusting a black box.
When would I actually need the ROI Calculator?
The most common reasons people reach for it: measuring the return on an ad campaign or a piece of equipment. Comparing two investments held for different lengths of time. Reporting campaign performance to a client. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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