Compound Interest vs. Simple Interest: Which One Builds Wealth Faster?

When you deposit money or borrow it, the type of interest matters. This page helps you:

• Compare simple vs. compound interest growth.
• Visualize how 'interest on interest' builds exponential wealth.
• Make smarter borrowing and lending decisions.

Explain Your Inputs: Why We Need This Data

We need a baseline to compare growth models:

• Principal Amount: The initial investment or loan.
• Interest Rate: Your expected annual return or cost.
• Time: The number of years the money will grow or be owed.

Interpretation Guide: Actionable Context

How to apply this knowledge:

• When you are investing: You always want compound interest. Your money scales exponentially.
• When you are borrowing: Simple interest is cheaper because you don't pay interest on the accumulated interest.

Explainable Logic: The Math Behind the Tool

We calculate both so you can compare the divergence. Simple Interest: Calculated only on the principal. A = P(1 + rt) Compound Interest: Calculated on principal and accumulated interest. A = P(1 + r/n)^(nt)

People Also Ask (PAA)

Which is better: simple or compound interest? If you are investing or saving money, compound interest is much better because your wealth grows exponentially. If you are borrowing money, simple interest is better because it costs you less over time.

Do banks use simple or compound interest? For savings accounts and most investments, banks use compound interest. For some short-term loans or auto loans, they may use simple interest, though mortgages and credit cards are compounding.

Who said compound interest is the 8th wonder of the world? This quote is widely attributed to Albert Einstein, highlighting the profound power of exponential growth over long periods of time.

Expand Your Finance Suite

• Compound Interest Calculator — Forecast your retirement.
• Loan Calculator — See the cost of compound debt.

Pro Tip: Thanks to our Calculation Cards feature, your results are saved to your profile history. You can safely navigate to our other guides without losing your context!