Interest Growth Calc
Simple & Compound Interest Projection
Total Interest Earned
Total Future Value
Visualize Your Wealth Growth
Understanding the difference between Simple and Compound interest is the most important financial lesson you'll ever learn. One grows your money, the other multiplies it.
Simple Interest
Calculated only on the original principal amount. Each period, you earn the same dollar amount. Common in short-term personal loans or specific bonds.
Compound Interest
Calculated on the principal AND the accumulated interest of previous periods. Your money earns interest, which then earns its own interest—a snowball effect.
Frequency Matters
The more often interest is compounded, the higher the total growth. Monthly compounding earns more than annual compounding, even with the same interest rate. Our tool handles these complex intervals instantly.
Wealth Building Insights
The Rule of 72
Divide 72 by your interest rate to see how many years it takes to double your money. (e.g., 6% rate = 12 years to double).
Inflation Protection
Compound interest is the best defense against purchasing power loss over decades. Start early, even with small amounts.