Simple Interest vs Compound Interest: Which Calculator Should You Use?

Simple and compound interest are the two ways interest is calculated. They give very different results over time.

The Difference

| | Simple Interest | Compound Interest |
|--|----------------|------------------|
| Calculated on | Principal only | Principal + accumulated interest |
| Growth | Linear | Exponential |
| Best for | Short-term loans | Long-term investments |

Simple Interest Formula

Interest = Principal x Rate x Time

Example: 1,00,000 at 10% for 5 years = 50,000 interest, total 1,50,000

Compound Interest Formula

A = P x (1 + r/n)^(n x t)

Example: 1,00,000 at 10% for 5 years compounding annually = 1,61,051

That is 11,051 more than simple interest over 5 years.

When to Use Each

| Scenario | Type |
|----------|------|
| Fixed deposit | Compound (quarterly) |
| Simple savings | Compound |
| Personal loan (simple) | Simple |
| PPF | Compound (annual) |
| Short-term loan | Simple |

Use the Right Calculator

• Use Simple Interest Calculator for short-term loans and quick math
• Use Compound Interest Calculator for investments and long-term savings

Why Compound Wins Over Time

At 10% for 20 years:
- Simple: 1,00,000 becomes 3,00,000
- Compound: 1,00,000 becomes 6,72,750

The difference grows with time. That is the power of compounding.

Calculate both with the free Simple Interest Calculator and Compound Interest Calculator.