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Investment calculator

Compound interest calculator

Calculate how much you'd accumulate over N years with compound interest — with an initial capital and regular contributions.

Total invested0.00 €
Accumulated interest0.00 €
Final amount0.00 €
Formula

How it's calculated

StepFormula
Capital growthFV = P × (1 + r/n)^(n×t)
With regular contributions+ PMT × (((1+r/n)^(n×t) − 1) / (r/n))

P — initial capital, r — annual rate, n — compounding periods per year, t — years, PMT — periodic contribution. This is a mathematical model — actual investment returns fluctuate and are not guaranteed.

Frequently asked questions

FAQ

Why does compounding frequency matter?

The more often interest is added to the capital, the sooner it starts earning interest itself — daily compounding gives a slightly higher result than annual compounding at the same nominal rate.

Does the calculator account for inflation or taxes?

No, this is a gross calculation. For real purchasing power see the inflation calculator; taxes on any gains (if applicable) need to be deducted separately.

Why invest with regular contributions instead of a lump sum?

Regular contributions (a DCA strategy) spread the purchase price over time and reduce the concentration of risk at a single point, while also benefiting from the compound interest effect.

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