Compound Interest Calculator
Calculate investment growth with compound interest, monthly contributions, annual rate, and time horizon.
Future value
€44,665.27
Contributed: €29,000.00
Interest earned: €15,665.27
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How to use the compound interest calculator
- Enter initial investment and, if applicable, recurring monthly contributions.
- Set expected annual return and time horizon in years.
- Review future value, total contributed, and interest earned from compounding.
What is it for?
The compound interest calculator shows how savings and investments grow when returns are reinvested—key for retirement, index funds, or long-term goals.
Beginner investors visualize the impact of modest monthly contributions over years versus leaving capital idle without reinvestment.
Projecting future value with configurable rate and horizon yields realistic scenarios for how much to save today and for how long.
Frequently asked questions
Is the annual return guaranteed?
No. It is a projection using the rate you enter. Real markets fluctuate; try conservative, moderate, and optimistic scenarios.
Does it include inflation and taxes?
It does not deduct inflation or tax withholdings. For real purchasing power subtract estimated inflation; for net returns check investment tax rules.
How is compound interest different from simple interest?
Compound interest earns on accumulated interest too, accelerating long-term growth compared with simple interest on initial capital only.
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