Investment Return Calculator

Investment Return Calculator

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Investment Return Calculator — Build Wealth with Regular Contributions

Our investment return calculator shows you how a combination of an initial lump sum and regular monthly contributions can grow over time with compound interest. Enter your starting amount, monthly contribution, expected annual return, and time horizon to see your projected future value — with a year-by-year breakdown.

The Power of Monthly Contributions (SIP)

Regular investing — even in small amounts — is one of the most effective ways to build wealth. A Systematic Investment Plan (SIP) works by investing a fixed sum every month. The combination of consistent contributions and compound growth means your portfolio accelerates over time. For example, investing $500 per month at 8% annual return for 20 years turns $130,000 of contributions into approximately $294,000 — more than double what you put in.

Understanding the Calculation

The future value of your portfolio is the sum of two components:

  • Lump sum growth: FV = P × (1 + r/12)^(12t) — your initial investment compounding monthly.
  • Annuity growth: FV = M × [(1 + r/12)^(12t) − 1] ÷ (r/12) — your monthly contributions growing over time.

Where r is the annual rate and t is years. The total future value is the sum of both.

Realistic Return Rate Expectations

  • Conservative (bonds/savings): 3–5% annual return
  • Moderate (balanced portfolio): 5–7% annual return
  • Growth (equity-heavy): 7–10% annual return
  • Aggressive (emerging markets): 10–15% — higher risk

Historical average for a diversified equity index fund (like S&P 500) is approximately 10% before inflation (7% after).

Frequently Asked Questions

What is SIP and how does it relate to this calculator?
SIP (Systematic Investment Plan) is a disciplined investment approach where a fixed amount is invested at regular intervals, typically monthly. The "monthly contribution" field in this calculator mirrors how SIPs work.
Does this account for inflation?
No. The figures shown are nominal (before inflation). To get real returns, subtract the inflation rate from your expected return (e.g., use 5% instead of 8% if inflation is 3%).
What if I can't maintain monthly contributions consistently?
The calculator assumes consistent monthly contributions. Gaps reduce the final value. However, even investing 10 out of 12 months per year produces strong results over long periods.
How does starting early make a difference?
Dramatically. Due to compounding, money invested in year 1 has far more time to grow than money invested in year 15. Investing $200/month from age 25 at 8% produces about twice as much as starting at 35 with the same contributions.
Are taxes and fees included in the calculation?
No. This is a pre-tax, pre-fee projection. In practice, investment returns are reduced by management fees (typically 0.1–1% per year for index funds vs. 1–2% for active funds) and capital gains taxes on withdrawals.