Samengestelde rente calculator

Samengestelde rente calculator

Compound Interest: How Your Money Makes Money on Its Own

Compound interest is what happens when you earn interest on your interest. Say you invest $10,000 at 10% -- after year one, you've got $11,000. But year two, you earn 10% on $11,000 (not just the original $10,000), giving you $12,100. That extra $100 doesn't sound like much, but give it 20 or 30 years and the snowball effect is genuinely jaw-dropping.

The Rule of 72: A Mental Math Shortcut

Want to know how long it takes your money to double? Divide 72 by your annual interest rate. At 6% interest, your money doubles in about 12 years. At 8%, it's roughly 9 years. At 12%, just 6 years. It's not exact, but it's close enough to be really useful.

Why Compound Interest Gets Crazy Over Long Periods

Here's where it gets interesting. Say you invest $10,000 at 7% per year. After 10 years, you've got about $19,672 -- nearly double. After 20 years, it's $38,697. After 30 years? $76,123. Look at those numbers carefully. In the first decade, you gained about $9,672. In the last decade alone, you gained $37,426 -- almost four times as much. That's compounding in action. Time isn't just a factor -- it's THE factor.

Savings Accounts vs. Investments: Same Principle, Wildly Different Results

Compound interest works in a savings account and in an investment portfolio, but the results aren't even close. A savings account at 2% doubles your money in 36 years. An index fund averaging 8% does it in 9 years. The catch? Investments can lose value in the short term. Savings accounts are safe but slow. The smart move for most people is to use both: savings for your emergency fund and short-term goals, investments for anything 10+ years out. Match your approach to your timeline and how much risk you can stomach.

How to Get the Most Out of Compound Interest

The single most important thing? Start early. Someone who starts investing at 25 will almost certainly end up with more than someone who starts at 35, even if the late starter invests more per month. Contribute consistently -- set up automatic monthly transfers so you don't have to think about it. Reinvest your dividends and interest instead of cashing them out. Watch out for fees -- a 1% annual fee doesn't sound like much, but over 30 years it can eat tens of thousands from your returns. And when the market drops (it will), don't panic and sell. Time in the market beats timing the market, every time.