Whether you are borrowing money for a loan or investing money for your future, understanding how interest is calculated is crucial. The Anivicus Interest Calculator helps you visually compare the massive difference between Simple Interest (SI) and Compound Interest (CI) over time.
Simple interest is calculated only on the principal amount (the initial amount you invested or borrowed). The interest earned does not get added to the principal for future calculations. This means your wealth grows in a straight, linear line.
Albert Einstein famously called compound interest the "Eighth Wonder of the World." Unlike simple interest, compound interest is calculated on both the initial principal AND the accumulated interest from previous periods. This means you earn "interest on your interest," allowing your wealth to grow exponentially over time.
If you play with the time slider on our calculator, you will notice something fascinating. For short durations (like 1 or 2 years), the difference between SI and CI is very small. However, as you increase the time horizon to 10, 20, or 30 years, the Compound Interest drastically outperforms Simple Interest. This is why financial experts always advise starting your investments early and staying invested for the long term.