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Investment Parameters

1 year 40 years
Total Invested
RON
Interest Earned
RON
Final Value
RON
Effective Rate
total yield

Investment Evolution Over Time

Yearly Details

Year Contributions Interest Year Total Invested Total Value
72

Rule of 72

Quickly estimate how long it takes to double your investment

The Rule of 72 is a simple formula: 72 / interest rate = years to double.

At your interest rate: 7%
Investment doubles in: ~10,3 ani
Interest Rate Doubles in Interest Rate Doubles in
2% 36 ani 8% 9 ani
4% 18 ani 10% 7,2 ani
6% 12 ani 12% 6 ani

About Compound Interest

What is compound interest? Compound interest means that the interest earned is added to the initial capital and itself generates interest. It is the most powerful mechanism for long-term investment growth — Albert Einstein called it the "eighth wonder of the world".

Formula: A = P(1 + r/n)nt + PMT × [((1 + r/n)nt - 1) / (r/n)]

  • P = initial amount (principal)
  • r = annual interest rate (in decimal form)
  • n = number of compounding periods per year (12 = monthly, 4 = quarterly, 1 = annual)
  • t = duration in years
  • PMT = monthly contribution

Monthly vs annual compounding: The more frequent the compounding, the higher the effective yield. At a 7% interest rate, monthly compounding generates an effective yield of 7.23%, compared to 7% with annual compounding.

Interest tax in Romania: Income from bank deposit interest is subject to a tax of 10%, withheld at source by the bank. Activate the "With 10% tax" option to see the fiscal impact.

Tips:

Start as early as possible — time is the most important factor
Regular contributions (even small ones) have an enormous long-term impact
Reinvest all earnings — do not withdraw the interest
Inflation reduces real yield — aim for an interest rate above the inflation rate

Investment Scenarios

Annual Interest Rate

Effective Annual Yield

Depending on compounding frequency

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