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Home/Finance/Compound Interest Calculator
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Finance · Updated 2026

Compound Interest Calculator

Find how much your savings grow over time with compound interest, including monthly deposits and the compounding frequency.

Enter your data

RON
%
yrs
RON

The recurring deposit is added each compounding period (monthly, quarterly or yearly).

=Future value
31,998.32RON
Initial amount10,000 RON
Total deposits12,000 RON
Interest earned+9,998.32 RON
Future value31,998.32 RON

Compound interest means interest on interest: earnings are reinvested and grow exponentially over time.

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Standard financial formulas (time value of money). Instant in-browser calculation, no account, no data sent. Interest rates are indicative — check the bank’s actual offer.

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iHow it is calculated

Compound interest adds the gain to the capital, and the new total itself earns interest. Future value is calculated as:

FV = P × (1 + r/n)^(n·years) + deposits

At 10,000, 5% a year, compounded monthly, over 10 years, the final value is ≈ 16,470 — over 6,400 in interest.

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?Frequently asked questions

What is compound interest?

It is interest calculated not only on the initial amount but also on previously accumulated interest. Money grows exponentially, because each gain itself earns interest.

How is compound interest calculated?

Future value = initial amount × (1 + r/n)^(n×years), where r is the annual rate and n the number of compoundings per year. Periodic deposits add their future value on top.

What is the difference between compound and simple interest?

With simple interest you earn only on the initial amount. With compound interest, interest is added to the capital and earns further interest, so over the long run the gap grows large.

What does compounding frequency mean?

It is how often interest is added to the capital: yearly, quarterly or monthly. The more frequent the compounding, the slightly higher the final value at the same annual rate.

How do monthly deposits affect the result?

Each deposit is added to the capital and begins earning interest. Regular deposits, even small ones, significantly raise the final value thanks to compounding.

What is the rule of 72?

A quick approximation: divide 72 by the annual rate to find how many years it takes to double your money. At 6% a year, money doubles in about 72 ÷ 6 = 12 years.

Does compound interest apply to loans too?

Yes. On loans, compounding works against you: unpaid interest is added to the balance. That is why repaying debt quickly greatly reduces the total cost.

Does the result account for inflation and taxes?

No. The calculator shows the nominal value. For real purchasing power, subtract inflation; for net gain, apply the interest tax (10% in Romania).

Why does time matter so much for compound interest?

Because the compounding effect accelerates over time. Starting 10 years earlier can be worth more than doubling the amount invested later.

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