Compound Interest Calculator
See how investments grow with compound interest and regular contributions.
Frequently Asked Questions
What is compound interest?+
Compound interest is interest earned on both your original principal and the interest already accumulated. Over time this 'interest on interest' effect accelerates growth, especially with frequent compounding and regular contributions.
How does compounding frequency affect returns?+
The more often interest compounds — monthly versus annually, for example — the more you earn, because interest starts earning interest sooner. This calculator supports annual, semi-annual, quarterly and monthly compounding.
How are monthly contributions treated?+
Monthly contributions are added as a recurring monthly deposit and grow as an annuity at the monthly rate (annual rate ÷ 12). The total contributions line shows your principal plus every deposit you make.
What is future value?+
Future value is what your investment is projected to be worth at the end of the period, including your principal, all contributions and the compound interest earned along the way.
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