Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Total ROI
45.00%
Annualized return
13.19%
Net gain
$4,500
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter initial cost ($).
- 2Enter final value ($).
- 3Enter holding period (years).
- 4Read your total roi on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
Compute return on investment from initial cost and final value, plus annualized return over the holding period.
Worked example
Using the values the calculator loads with:
Inputs
- Initial cost: 10000 $
- Final value: 14500 $
- Holding period: 3 years
Results
- Total ROI: 45.00%
- Annualized return: 13.19%
- Net gain: $4,500.00
What each field means
Inputs
- Initial cost ($)
- The initial cost used in the calculation, measured in $. Starts at 10000 $ so you have a working example on load.
- Final value ($)
- The final value used in the calculation, measured in $. Starts at 14500 $ so you have a working example on load.
- Holding period (years)
- The holding period used in the calculation, measured in years. Starts at 3 years so you have a working example on load.
Results
- Total ROI
- Returned as a percentage and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Annualized return
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Net gain
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the roi calculator work?
Compute return on investment from initial cost and final value, plus annualized return over the holding period. The underlying maths is: ROI = (Value − Cost) / Cost · 100%. Annualized = (Value/Cost)^(1/t) − 1.
What do I need to enter?
3 values: initial cost, final value, and holding period. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the total roi result mean?
It is returned as a percentage and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). ROI Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/roi
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/roi" target="_blank" rel="noopener">ROI Calculator — RevenueLab</a> (2026).</p>
Source: [ROI Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/roi) (2026).