Updated 2026-03-20 · Calculated at 7% average annual return (S&P 500 historical average)
See how $1,000 grows each year at 7% interest, comparing monthly vs annual compounding.
| Year | Principal | Interest Earned | Annual Compounding | Monthly Compounding |
|---|---|---|---|---|
| 1 | $1,000 | $72 | $1,070 | $1,072 |
| 2 | $1,000 | $150 | $1,145 | $1,150 |
| 3 | $1,000 | $233 | $1,225 | $1,233 |
| 4 | $1,000 | $322 | $1,311 | $1,322 |
| 5 | $1,000 | $418 | $1,403 | $1,418 |
| 6 | $1,000 | $520 | $1,501 | $1,520 |
| 7 | $1,000 | $630 | $1,606 | $1,630 |
| 8 | $1,000 | $748 | $1,718 | $1,748 |
| 9 | $1,000 | $874 | $1,838 | $1,874 |
| 10 | $1,000 | $1,010 | $1,967 | $2,010 |
With monthly compounding, your $1,000 grows to $2,010. With annual compounding, it grows to $1,967. The difference of $43 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 7%, your money doubles approximately every 10.3 years.
With monthly compounding, $1,000 at 7% annual interest grows to $2,010 after 10 years. That is $1,010 in interest earned. With annual compounding, you would get $1,967 — monthly compounding earns you an extra $43.
Using the Rule of 72, your money doubles in approximately 10.3 years at 7% annual interest. So $1,000 would become approximately $2,000 after 10.3 years.
Yes. A diversified stock market portfolio (S&P 500) has historically returned 7-10% annually. 7% is a reasonable assumption for long-term equity investing.
Calculate your own numbers with our free tools
Open CalcuWealth Calculators →