Simple Interest vs Compound Interest: What’s the Difference?
Side-by-Side Comparison
| Simple Interest | Compound Interest | |
|---|---|---|
| Definition | Interest calculated only on the original amount (principal), not on any previously earned interest. The simpler form of interest calculation. | Interest calculated on both the original amount and any interest already earned. Your money grows faster over time because you earn "interest on interest." |
| Example | $1,000 at 5% simple interest earns exactly $50 per year, every year. | $1,000 at 5% compound interest becomes $1,050 after year one, $1,102.50 after year two (you earned interest on $1,050, not just $1,000). |
Understanding Simple Interest
Simple interest is straightforward to calculate and understand, making it a great starting point for learning about interest. The formula is Principal times Rate times Time. Unlike compound interest, simple interest doesn't grow faster over time because you only earn interest on the original amount. Some car loans and short-term personal loans use simple interest. Understanding the difference between simple and compound interest helps you compare financial products more accurately and appreciate why compound interest is so powerful for long-term savings.
Understanding Compound Interest
Compound interest is often called the eighth wonder of the world because of how powerfully it grows money over time. The earlier you start saving, the more compounding works in your favor. A teenager who saves $1,000 at 5% will have significantly more by retirement than someone who starts in their 30s, even if the older person saves more total dollars. Compounding also works against you with debt. Credit card balances grow through compound interest, which is why paying only the minimum can keep you in debt for years.
Learn More About Each Term
Frequently Asked Questions
What is the difference between simple and compound interest?
Simple interest is calculated only on the original principal amount. Compound interest is calculated on the principal plus all previously earned interest. Over time, compound interest produces significantly more growth.
Which is better for savings, simple or compound interest?
Compound interest is better for savings because your money grows faster. Each period, you earn interest on both your original deposit and the interest it has already generated.
Which is better for loans, simple or compound interest?
Simple interest is better when you are borrowing because you only pay interest on the original loan amount, not on accumulated interest. This means lower total cost over the life of the loan.
Practice Banking Concepts Hands-On
Understand Simple Interest and Compound Interest by experiencing them in a realistic banking simulator.