ROI Calculator — Toolisco

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1. Investment

Simple ROI

Currency symbol (display only)

Initial investment

Additional costs or fees (optional)

Final value

2. Result

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Enter the investment amounts, then press Calculate ROI.

ROI here is simple, not annualised: it covers the whole holding period regardless of its length.

Educational estimate only — not financial advice.

About this tool

About ROI Calculator

ROI Calculator works out the return on investment from what you put in, any fees or extra costs, and what the investment is worth now or when you sold it. It shows total invested, net gain or loss, and ROI as a percentage. It is a simple, non-annualised measure. Educational estimate only — not financial advice.

ROI is a quick way to compare the outcome of an investment with what it cost. Including fees gives a more honest figure, and seeing the formula with your numbers makes the result easy to check.

How to use

Step by step

Choose a currency symbol (display only).
Enter the initial investment.
Optionally enter fees or extra costs.
Enter the final value.
Press Calculate ROI, then copy or download the summary.

Key features

What it offers

ROI = (final value − total invested) ÷ total invested × 100
Fees and extra costs added to the amount invested
Gains, losses and break-even shown clearly
Exact arithmetic in whole currency units and cents
Step-by-step working with your numbers
Summary includes inputs, formula and disclaimer

Best practices

Tips for best results

Include every cost you paid — brokerage, commissions and charges — in fees.
Remember ROI ignores how long you held the investment; use CAGR to compare different time periods.
Use the same currency for every amount.
Treat the result as an estimate; taxes and inflation are not included.

Benefits

Why people use it

Clear

Gain or loss and ROI side by side.

Transparent

Formula and steps shown.

Precise

Calculated in cents, not floating guesses.

Private

Calculated in your browser.

FAQ

Common questions

ROI = (final value − total invested) ÷ total invested × 100, where total invested is the initial investment plus any additional costs or fees you enter.

No. It is simple ROI over the whole holding period, whether that was one month or ten years. To compare investments held for different lengths of time, use an annualised measure such as CAGR.

Fees, commissions, taxes paid on purchase and similar costs are part of what you put in. Adding them to the total invested shows the return on everything you spent, not just the purchase price.

Yes. If the final value is lower than the total invested, the net result is a loss and ROI is negative. A final value of 0 gives an ROI of −100%.

No. The symbol is for display only; no exchange rates are fetched and the numbers are not converted.

Amounts are handled in whole cents (or paise), so totals are exact. ROI is shown rounded to two decimal places.

As a starting point for your own understanding. Educational estimate only — not financial advice. It does not account for taxes on gains, inflation, dividends received or the timing of cash flows.

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Private by design

This runs entirely in your browser

No file or text you enter here is uploaded. Encoding and decoding happen on your device using native browser APIs — close the tab and nothing remains on a server.

How privacy works