Turn cost basis and final value into a clearer return view

ROI measures how much profit or loss an investment generated relative to the money committed to it. This page preserves the original source logic, then adds a clearer output layout with annualized ROI, charts, scenario compare, local history, and a printable two column PDF.

ROI and annualized ROI Extra costs and income Charts and PDF export Compare and save
ROI
Profit relative to cost basis
Annualized
Time adjusted comparison
Inputs
Costs income and period

How to use the ROI Calculator

  1. 1

    Enter the investment amount

    Input the initial amount invested and the final value of the investment.

  2. 2

    Set the holding period

    Enter the investment period and choose whether the value is in years, months, or days.

  3. 3

    Add optional extras

    Include extra costs and extra income if they are part of the overall investment result.

  4. 4

    Calculate and compare

    Press Calculate ROI to review ROI, annualized ROI, charts, scenario compare, and the PDF export layout.

Detailed guide and references▶

What ROI is

Return on investment or ROI is a simple profitability ratio. It compares net profit to the money committed to the investment. Because the result is expressed as a percentage, ROI is often used to compare opportunities quickly, although time and risk still matter.

Person reading documents and reports about investment return
ROI is a simple way to connect profit, cost basis, and time

Formulas used on this page

This calculator preserves the original source formulas:

  • Cost of Investment = Initial Investment + Additional Costs
  • Net Profit = Final Value - Initial Investment + Additional Income - Additional Costs
  • ROI (%) = Net Profit / Cost of Investment × 100
  • Annualized ROI (%) = [(1 + ROI)^(1 / n) - 1] × 100, where n is years held

The investment period is converted to years when the selected unit is months or days, using 12 months or 365 days per year.

Interpreting results

ROI answers a simple question: how much profit or loss was generated relative to the cost basis?

Positive ROI

  • A positive value means the investment produced a profit.
  • Higher values indicate stronger profitability relative to cost basis.
  • Compare the result with alternatives and with the time required to earn it.

Negative ROI

  • A negative value means the investment produced a loss.
  • The size of the negative percentage reflects how large the loss was versus the cost basis.

Annualized ROI

  • Use annualized ROI when comparing investments with different holding periods.
  • It translates the total return into a yearly rate using the source formula.

Limitations

ROI is useful, but it should not be the only metric used in an investment decision.

Time value of money

  • Simple ROI does not show when returns happened.
  • Annualized ROI helps, but it is still a simplified comparison tool.

Risk and variability

  • Two investments can have the same ROI with very different risk profiles.
  • Volatility, liquidity, and probability of loss are not captured directly here.

Non financial factors

  • Some investments provide strategic or personal value beyond measured cash return.
  • Those benefits are not reflected in this calculator.

Practical tips

  1. Use realistic final values and include every meaningful extra cost.
  2. Include extra income only when it is clearly part of the investment result.
  3. Compare annualized ROI when the holding periods are different.
  4. Review ROI together with risk, liquidity, taxes, and fees outside this tool.

FAQs

What does ROI measure?▶

ROI measures net profit or loss relative to the investment cost basis and expresses the result as a percentage.

Why is cost basis not just the initial investment?▶

In this calculator, additional costs are added to the initial investment, so the ROI denominator reflects the full cost basis.

Can annualized ROI differ a lot from total ROI?▶

Yes. A modest total ROI earned in a short time can translate into a high annualized rate, while the same total ROI over many years produces a lower annualized figure.

Can ROI be negative?▶

Yes. If the final value and extra income do not cover the initial investment and extra costs, the result becomes a negative ROI.

Key takeaways

  • ROI compares net profit to the full investment cost basis
  • Additional costs lower ROI and additional income raises it
  • Annualized ROI helps compare investments across different time periods
  • Negative ROI indicates a loss relative to money committed
  • Use ROI together with risk and other investment context

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Calculator

Enter investment cost basis, final value, and time period, then press Calculate ROI

These results are for general reference only and may differ from actual investment performance.