Syed Waleed
Compound Interest Calculator
See exactly how your savings and investments grow over time. Enter your starting amount, interest rate, monthly contributions, and time horizon — get your final balance plus a year-by-year breakdown.
Your numbers
Growth over time
| Year | Start balance | Contributions | Interest earned | End balance |
|---|
Math note: interest is applied to the running balance and compounds at the frequency you select. Monthly contributions are added at the start of each month. Figures ignore taxes, inflation, and fees.
Every calculation runs in your browser. Your numbers are never uploaded or stored anywhere.
No account, no email, no paywall — open the page and start calculating.
Unlimited calculations, breakdowns, and charts. No limits, no trial.
How to use
- 1Enter your starting amount
Type your initial principal — for example $10,000 in savings or an investment account.
- 2Set the rate, contribution, and time
Add your expected annual interest rate, how much you will add each month, and how many years the money will grow.
- 3Pick a compounding frequency
Choose monthly, quarterly, or yearly compounding — more frequent compounding grows your money slightly faster.
- 4Review your growth
Read your final balance, total interest, the growth chart, and the year-by-year table. Copy the summary to share or save.
Features
See start balance, contributions, interest earned, and end balance for every single year.
Stacked bars show how much of your balance is your own money versus interest earned.
Compare monthly, quarterly, and yearly compounding to see how frequency affects returns.
Model real savings habits by adding a fixed contribution every month.
Every figure is formatted as US dollars with two decimals for easy reading.
All math happens on your device. Nothing you type ever leaves your browser.