How Much Will My Savings Grow? Compound Interest Guide
How compound interest works
When you earn interest, it is added to your balance. Next month, you earn interest on the bigger balance. Over many years this snowball effect adds up. The longer you save, the more it helps.
How to use the savings calculator, step by step
- Enter your starting deposit.
- Enter your monthly contribution.
- Enter the APY of your account.
- Set the years to grow.
- Add a savings goal to see when you reach it.
Example: small changes, big results
All examples start with $1,000 and run for 10 years at 4.5% APY.
| Monthly deposit | Total after 10 years |
|---|---|
| $100 | about $16,700 |
| $200 | about $31,800 |
| $300 | about $46,900 |
Doubling the monthly deposit from $100 to $200 nearly doubles the result. Contributions matter more than the rate in the early years.
Where to keep your savings
- High-yield savings accounts often pay far more than a basic savings account. Compare APYs and check for fees.
- Make sure the account is insured. In the US, look for FDIC or NCUA coverage.
- Automate your deposit on payday so saving happens before spending.
What to avoid
Rates can change at any time, so treat the APY as an estimate. Do not lock money you may need soon into long term products. Build an emergency fund first, then invest for long goals. For long term planning, see the retirement calculator.
Frequently asked questions
How much will my savings grow in 10 years?
Starting with $1,000 and adding $200 a month at 4.5% APY, you would have about $31,800 after 10 years. About $6,800 of that is interest.
What is APY?
APY is the yearly return on savings after compounding. It is the rate to enter in the savings calculator.
What is compound interest?
Compound interest means you earn interest on your deposits and on the interest you already earned.
How can I reach my savings goal faster?
Raise your monthly contribution, start with a bigger deposit, or find an account with a higher APY.