See how your money grows — before you invest
Use our free compound interest calculators to model investment growth, compare strategies, and see how small weekly, monthly, or lump-sum contributions can grow over time.
Start here (60 seconds)
- Pick a calculator above
- Enter your numbers (contributions, years, return/interest rate)
- Compare scenarios (conservative vs optimistic)
- Use the articles for real-world examples and ideas
New to investing? Learn how compound interest really works →
Popular calculators
Money Growth: See how weekly/monthly investing compounds over time.
Retirement: Estimate the balance needed to fund $X per year in retirement.
ETF vs Savings: Compare market-style returns vs savings interest over your timeline.
Start Late? See what happens if you begin investing at 40/50/60 — and what “catch-up” could look like.
Popular links
Featured articles
Quick answers to common questions — each one links to a calculator so you can run your own numbers.
Why this site exists
Many people invest without ever modelling what their money could become. These tools help you run the numbers first, then understand what changes (more time, bigger contributions, different rates) do to the outcome.
Tip
If you’re unsure where to start, try Money Growth first — it’s the quickest way to see the power of compounding.
FAQ
What does this site actually do?
It gives you simple calculators to model how your money could grow over time, compare strategies, and see what changes (like higher contributions or more time) do to your result.
Is this financial advice?
No. These tools are educational only. They help you run numbers and scenarios, but they don’t account for tax, fees, inflation, or your personal situation.
Which calculator should I start with?
Start with Money Growth. It’s the quickest way to understand compounding and what regular investing can do over time.
Why do results differ from other calculators?
Different sites make different assumptions (monthly vs annual compounding, contribution timing, fees, rounding). The important part is comparing scenarios consistently.
How do I understand the maths behind the results?
Read How compound interest really works → for a simple explanation and the formula.