About SimpleCompoundInterest.com

SimpleCompoundInterest.com exists to make one idea — how interest grows — genuinely easy to understand. It combines free calculators, interactive charts and plain-language explanations so students, teachers and everyday savers can see the math, not just the answer.

What you'll find here

• Simple and compound interest calculators with instant, in-browser results
• An interactive side-by-side comparison and compound frequency explorer
• A goal calculator that solves the interest formulas backwards
• A learning center with worked examples, FAQ and a short knowledge quiz

How it works

Everything runs in your browser. There are no accounts, no ads and no trackers; your saved calculations live only in your own device's local storage. The math uses the standard textbook models and is covered by automated tests — see our disclaimer for the honest limitations.

Reuse in classrooms

Teachers are welcome to use the calculators and examples in class. The examples are hypothetical and designed to be re-typed with your own numbers.

Questions? Reach us via the contact page.