Compound Interest on $1,000 at 10% for 20 Years
Calculate how $1,000 grows to over $7,000 at 10% annual interest compounded monthly over 20 years.
How to use this tool
- Enter starting amount, annual interest rate, compounding frequency and years in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your final balance and the full breakdown beneath it.
This example shows the dramatic effect of compound interest over two decades, even with a small starting amount.
Frequently asked questions
- What does compounding frequency change?
- More frequent compounding (e.g. daily vs annually) earns slightly more, because interest is added — and starts earning — sooner.
- Does this include monthly contributions?
- No — this is for a single lump sum. Use the Investment Growth Calculator to add regular monthly contributions.