General information only. This calculator uses an estimated average return of 7.5% p.a. and is for educational purposes only. Actual returns vary and are not guaranteed. Not personal financial advice.

📈 Tool

Compound Interest Calculator
Watch your money snowball.

Put in a starting amount and a monthly contribution — and see what time does to your money. This is the most powerful concept in personal finance, and most people never use it.

What is compound interest?

Regular interest means you earn a return on your original money. Compound interest means you earn a return on your original money plus all the interest you've already earned. Over time, this creates a snowball effect — the longer you leave it, the faster it grows.

Einstein (allegedly) called it the eighth wonder of the world. Whether he said it or not, the maths backs it up.

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Starting Amount
The money you already have saved and ready to invest today.
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Monthly Contributions
What you add each month — even small amounts make a huge difference over time.
Time
The most powerful variable of all. Starting early beats everything else.
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This calculator uses a fixed rate of 7.5% per year — a conservative blended average between Australian ETF index funds (historically ~9–10% p.a.) and property (~6–7% p.a.). It's an estimate, not a guarantee. Real returns go up and down, and past performance doesn't predict future results.

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Compound Interest Calculator
Rate: 7.5% p.a. · Compounded monthly
$
✏️ Enter 0 if you're starting from scratch
$
✏️ Even $50/month adds up fast
⏳ Select a time horizon
Total value after 5 years
$0
at 7.5% p.a.
Your contributions
$0
what you actually put in
Interest earned 🌱
$0
free money from time
📈 Portfolio growth over time — contributions vs. interest earned
✏️ Taylor's take

Run the numbers to see the insight.