Investment Calculator
The Investment Calculator is a comprehensive tool that helps you make informed investment decisions. Calculate the future value of your investment, find out how much you need to invest initially, determine the required rate of return, or estimate the time to reach your financial goal.
How to Use This Calculator
Select What to Calculate:
- Final Balance — Find out how much your investment will grow over time.
- Initial Investment — Determine how much you need to invest today to reach a target.
- Rate of Return — Find the annual return required to hit your goal.
- Time Period — Calculate how long it will take to reach your desired balance.
Choose your currency (28 world currencies supported, including USD and RUB), set the number format (American: 1,000.50 or Metric/European: 1.000,50), and fill in the investment parameters. Optionally add an inflation rate to see the real purchasing-power-adjusted final balance, and set up periodic contributions to model regular deposits.
Investment Calculator Formula
The calculator uses the standard compound interest formula with periodic contributions:
FV = PV × (1 + r/n)n×t + PMT × ((1 + r/n)n×t − 1) / (r/n)
Where:
- FV — Future Value (Final Balance)
- PV — Present Value (Initial Investment)
- r — Annual Rate of Return (decimal)
- n — Compounding Frequency (times per year)
- t — Investment Term (years)
- PMT — Periodic Contribution per compounding period
Understanding Compounding
Compound interest is the core concept behind investment growth. Your interest earns interest, creating an exponential snowball effect over time. The more frequently interest compounds, the greater the final balance:
- Daily (365×/year) — maximum compounding effect
- Monthly (12×/year) — typical for savings accounts and investment funds
- Quarterly (4×/year) — common for bonds
- Semi-Annually (2×/year) — some fixed-income products
- Annually (1×/year) — simplest compounding, used in basic analysis
Inflation and Real Returns
Inflation erodes the purchasing power of money over time. If your investment earns 7% annually but inflation runs at 3%, your real rate of return is approximately 4%. The calculator shows the inflation-adjusted balance so you can see the true value of your investment in today's money.
American vs. Metric Number Format
- American format: 1,000,000.50 (period as decimal separator, comma as thousands separator)
- Metric/European format: 1.000.000,50 (comma as decimal separator, period as thousands separator)
Frequently Asked Questions
What is a good rate of return on investment?
Historically, the US stock market (S&P 500) has returned about 7–10% per year on average. Savings accounts typically offer 2–5%, while riskier assets can exceed 15%. Always consider risk tolerance and investment horizon.
How do periodic contributions affect my investment?
Regular contributions dramatically increase the final balance through the power of compounding. Even small monthly additions compound over decades into substantial sums — a concept known as "dollar-cost averaging."
What currencies does this calculator support?
This calculator supports 28 world currencies including USD (US Dollar), RUB (Russian Ruble), EUR (Euro), GBP (British Pound), JPY (Japanese Yen), CNY (Chinese Yuan), and many more. All calculations are currency-agnostic — only the symbol changes.
What is the difference between nominal and real return?
The nominal return is the stated percentage growth of your investment. The real return subtracts inflation and represents the actual increase in purchasing power. Use the inflation rate field to see both.