Compound Interest Calculator
Growth over time, with your choice of compounding frequency.
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Calculate compound interest growth on a principal amount over time, with a choice of compounding frequency, and see how much more it earns compared to simple interest.
Frequently asked questions
What formula does this use?
A = P(1 + r/n)^(nt), where P is the principal, r is the annual interest rate, n is how many times per year interest compounds, and t is the time in years.
Does compounding frequency really matter?
Yes, though the effect is usually modest — the same rate compounded monthly earns slightly more than compounded annually, since interest starts earning its own interest sooner.