Investment Return Calculator
This investment return calculator projects how your money could grow over time using compound interest. Enter an initial investment, an expected annual return rate, and a time horizon, and it shows your total value, total return, and compound annual growth rate (CAGR) in real time.
It is built for anyone modelling future wealth — planning for retirement, saving toward a goal, or comparing strategies. Add a monthly contribution to model regular investing, change the compounding frequency, and adjust for inflation and tax to see what your projected balance is really worth.
How to Use the Investment Return Calculator
Enter your initial investment
Type the lump sum you plan to invest upfront, or drag the slider for a quick adjustment. The currency picker lets you switch the unit and scales all the inputs to match.
Set your annual return rate
Choose an expected yearly return, or tap a preset — 5%, 7%, 8%, 10%, or 12% — to model common benchmarks from conservative bonds to aggressive equities.
Choose your time horizon
Set the Investment Period from 1 to 50 years, or use the 5, 10, 20, and 30-year presets. Longer periods amplify the compounding effect significantly.
Add monthly contributions
Optionally enter a recurring Monthly Contribution. Even small regular investments can make a substantial difference over decades.
Fine-tune the advanced options
Pick a Compounding Frequency (Daily through Annually), enter an Inflation Rate for real purchasing power, and add a Tax Rate on gains for an after-tax view.
Review your results
Check the summary cards for Total Value, CAGR, and Inflation-Adjusted Value, explore the growth chart, and expand the Year-by-Year Breakdown for detailed annual figures.
Features
Compound Interest Engine
Precise period-by-period compounding turns your initial investment, contributions, and return rate into a projected total value.
CAGR Calculation
See the compound annual growth rate that smooths your investment from start to finish into a single comparable return.
Monthly Contributions
Model regular investing by adding a recurring monthly amount and watch how consistent deposits accelerate growth.
Return Rate Presets
Adjust the annual return with a slider or jump to 5%, 7%, 8%, 10%, and 12% presets for common benchmarks.
Compounding Frequency
Choose Daily, Monthly, Quarterly, Semi-Annually, or Annually to see how compounding cadence changes your total.
Inflation Adjustment
Enter an expected inflation rate to reveal the Inflation-Adjusted Value — what your future balance is worth in today's money.
Tax Impact Analysis
Add a tax rate to compute the After-Tax Value; tax applies only to your gains, never to your original contributions.
Growth Chart
An interactive area chart compares total portfolio value against total invested, showing the compounding effect over time.
Value Breakdown
A donut chart splits your final value into initial investment, additional contributions, and interest or returns.
Year-by-Year Breakdown
Expand a collapsible table of annual contributions, interest earned, total interest, and ending balance.
Multi-Currency Support
Switch currencies with the built-in picker and all values, sliders, and defaults adjust to the selected currency's scale.
Private & Local
Every projection is computed in your browser, so your financial assumptions never leave your device.
Frequently Asked Questions
How do you calculate return on investment?
Your total return is the final value minus everything you put in (Total Value minus Total Invested), and the total return percentage divides that gain by your total invested. This calculator works it out automatically as you change the inputs, and also shows CAGR for an annualized view.
What is compound interest and how does it grow my investment?
Compound interest is interest earned on both your original principal and the interest accumulated from previous periods. Because your earnings start generating their own earnings, growth accelerates over time into an exponential curve rather than a straight line.
What is CAGR versus total return?
Total return is the overall percentage gain across the whole period, while CAGR (Compound Annual Growth Rate) is the smoothed yearly rate that would take your investment from its starting value to its ending value. CAGR is useful for comparing investments with different time horizons or contribution patterns.
How does compounding frequency affect my returns?
The more often interest compounds, the more you earn, because each period's interest starts earning interest sooner. Daily compounding produces slightly higher returns than monthly, which beats annually. The gap widens with higher return rates and longer time horizons.
How do monthly contributions affect investment growth?
Adding a recurring monthly contribution feeds new money into the calculation every period, and each deposit then compounds for the rest of the term. Over decades, consistent contributions often add far more to the final balance than the initial lump sum alone.
How do inflation and taxes affect real returns?
Inflation erodes purchasing power, so the Inflation-Adjusted Value shows your future balance in today's money. Tax applies only to your gains: the After-Tax Value equals Total Value minus (Total Return times your tax rate). Actual tax treatment varies by jurisdiction and account type.
What return rate should I use?
It depends on your investment type. As a rough historical guide: savings accounts and CDs 1-5%, government bonds 3-5%, a balanced stock-and-bond portfolio 6-8%, the S&P 500 around 8-10%, and aggressive growth 10-15%. Past performance does not guarantee future results, so a conservative estimate is safer for planning.
Can I use this for retirement planning?
Yes. Set the initial investment to your current savings, add your planned monthly contribution, choose a realistic return rate (7-8% for a diversified portfolio), and set the period to your years until retirement. Use the inflation adjustment to see the real purchasing power of your nest egg.
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