Finance

Compound Interest & Savings Calculator

Compound interest calculator: project how an initial deposit plus monthly contributions grow with compounding returns.

Compound interest is "interest on interest": your earnings are reinvested and generate their own earnings. Enter your starting balance, monthly contribution, expected annual return, and time horizon to see the power of compounding.

Frequently asked questions

What's the difference between simple and compound interest?

Simple interest is calculated only on the original principal, while compound interest is calculated on the principal plus accumulated earnings, which accelerates growth significantly over the long term.

Is the result guaranteed?

No. This is a mathematical model that assumes a constant return, but real investments fluctuate. Use it for planning and education, not as a promise of returns.