Savings Calculator
Plan your path to financial freedom — no jargon, just numbers.
What Is Compound Interest?
Compound interest is the process of earning interest not just on your original investment, but also on the interest you’ve already earned. In simple terms: your money makes money, and then that money makes more money.
It’s often called the eighth wonder of the world — and for good reason. Over time, even small amounts invested consistently can grow into life-changing sums.
How Does It Work? A Simple Example
Imagine you invest $1,000 today at a 7% annual interest rate and add $100 every month.
After 10 years you’d have around $18,000 — but you only put in $13,000. The extra $5,000 came from compound interest doing its work quietly in the background.
After 20 years? Over $54,000 — from just $25,000 contributed. The longer you wait, the more dramatic the effect.
The Key Factors That Affect Your Results
- Time — the single most important factor. Starting 10 years earlier can double your final balance.
- Interest rate — even a 1-2% difference compounded over decades makes a massive impact.
- Monthly contributions — consistent small additions dramatically accelerate growth.
- Compounding frequency — the more often interest compounds (monthly vs annually), the faster your money grows.
Frequently Asked Questions
What is a good interest rate to use?
For long-term stock market investments, 7% is a commonly used historical average for index funds after inflation. For high-yield savings accounts, current rates range from 4-5%.
Does compound interest work against me too?
Yes — on debt. Credit card companies use compound interest against you, which is why high-interest debt should always be paid off before investing.
How often should I compound?
Monthly compounding is standard for most savings accounts and investments. The more frequently interest compounds, the better for your balance.
Is compound interest the same as compound growth?
Essentially yes. Whether it’s interest, dividends, or investment returns — if gains are reinvested, the compounding effect applies.
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