Updated 2026-03-20 · Calculated at 7% average annual return (S&P 500 historical average)
See how $1,000 grows each year at 5% interest, comparing monthly vs annual compounding.
| Year | Principal | Interest Earned | Annual Compounding | Monthly Compounding |
|---|---|---|---|---|
| 1 | $1,000 | $51 | $1,050 | $1,051 |
| 2 | $1,000 | $105 | $1,103 | $1,105 |
| 3 | $1,000 | $161 | $1,158 | $1,161 |
| 4 | $1,000 | $221 | $1,216 | $1,221 |
| 5 | $1,000 | $283 | $1,276 | $1,283 |
| 6 | $1,000 | $349 | $1,340 | $1,349 |
| 7 | $1,000 | $418 | $1,407 | $1,418 |
| 8 | $1,000 | $491 | $1,477 | $1,491 |
| 9 | $1,000 | $567 | $1,551 | $1,567 |
| 10 | $1,000 | $647 | $1,629 | $1,647 |
With monthly compounding, your $1,000 grows to $1,647. With annual compounding, it grows to $1,629. The difference of $18 comes from interest earning interest more frequently.
Monthly compounding always produces a higher result because your interest starts earning its own interest 12 times per year instead of once.
A quick way to estimate how long your money takes to double: divide 72 by the interest rate. At 5%, your money doubles approximately every 14.4 years.
With monthly compounding, $1,000 at 5% annual interest grows to $1,647 after 10 years. That is $647 in interest earned. With annual compounding, you would get $1,629 — monthly compounding earns you an extra $18.
Using the Rule of 72, your money doubles in approximately 14.4 years at 5% annual interest. So $1,000 would become approximately $2,000 after 14.4 years.
Yes. High-yield savings accounts and CDs currently offer 4-5% APY. US Treasury bonds yield around 4-5%. This is a conservative, achievable rate.
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