Investment Calculator
Calculate future investment value with initial amount, regular contributions, interest rate, and compounding frequency.
Future Value
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total invested
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interest earned
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total return
What is Investment Calculator?
An investment calculator projects the future value of a portfolio by combining a one-time initial investment with regular monthly contributions, compounded at an expected annual return rate. It shows how consistent investing over time — even with modest monthly amounts — can compound into substantial wealth. Use it to model different scenarios and set realistic long-term financial goals.
How to use
- 1 Enter your initial lump-sum investment amount (enter 0 if starting from scratch).
- 2 Enter the monthly contribution you plan to add regularly.
- 3 Input the expected annual return rate for your chosen investment type.
- 4 Enter the investment horizon in years.
- 5 The future portfolio value, total invested, interest earned, and total return percentage are calculated instantly.
Formula
Example calculation
Investing $10,000 upfront and adding $500 per month for 10 years at an 8% annual return grows to approximately $109,000. Your total contributions are $70,000 ($10,000 + $500×120 months), and compound growth adds roughly $39,000 — a 56% return on invested capital.
Frequently asked questions
What annual return rate should I use for different asset classes?
Common long-term estimates: broad stock market index funds 7–10%, equity mutual funds 10–12%, bonds/fixed income 4–6%, real estate 6–9%, gold 6–8%. Always use conservative estimates for planning to build in a safety margin.
How important are monthly contributions vs. the initial lump sum?
Both matter, but consistent monthly contributions often dwarf the initial amount over long periods. At 8% for 20 years, $500/month with $0 initial grows to roughly $294,000, while $10,000 initial with $0/month grows to only $46,600.
What is the impact of fees on investment returns?
Even a 1% annual fee compounds significantly over time. Over 30 years at 8% gross return, a 1% expense ratio reduces final portfolio value by about 20–25%. Prefer low-cost index funds with expense ratios below 0.20%.
Should I invest a lump sum or spread it out (dollar-cost averaging)?
Research shows lump-sum investing beats dollar-cost averaging about two-thirds of the time in rising markets, since more money is invested earlier. However, DCA reduces regret risk and is psychologically easier, especially for large sums.
How does tax affect investment returns?
Taxes on dividends, capital gains, and interest reduce your effective return. Tax-advantaged accounts (401k, IRA in the US; PPF, NPS, ELSS in India) can shelter returns from tax, significantly boosting long-term compounding.