Enter your starting point
Enter your starting amount, the annual interest rate, and how many years you will leave the money invested.
CALCULATORS · FREE ONLINE TOOL
Compound Interest Calculator
See how your savings grow with compound interest and regular contributionsMoney left alone grows in a way our brains are not wired to guess. A compound interest calculator makes the curve visible: enter your starting amount, rate, compounding frequency and years, and see the final balance plus how much came from interest.
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Use Compound Interest Calculator
See how your savings grow with compound interest and regular contributions
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Between 0 and 100 years.
Contributions are monthly. They are converted per compounding period and added at the end of each period.
Future value
$ 44,665.27
Total you put in
$ 29,000.00
Interest earned
$ 15,665.27
Breakdown Contributions on top of your starting amount: $ 24,000.00. Interest earned is the future value minus everything you put in.
| Year | Balance at year end | Interest earned that year | Contributions that year |
|---|---|---|---|
| 1 | $ 7,839.97 | $ 439.97 | $ 2,400.00 |
| 2 | $ 10,885.24 | $ 645.27 | $ 2,400.00 |
| 3 | $ 14,150.65 | $ 865.41 | $ 2,400.00 |
| 4 | $ 17,652.12 | $ 1,101.47 | $ 2,400.00 |
| 5 | $ 21,406.71 | $ 1,354.59 | $ 2,400.00 |
| 6 | $ 25,432.72 | $ 1,626.01 | $ 2,400.00 |
| 7 | $ 29,749.77 | $ 1,917.05 | $ 2,400.00 |
| 8 | $ 34,378.90 | $ 2,229.13 | $ 2,400.00 |
| 9 | $ 39,342.67 | $ 2,563.77 | $ 2,400.00 |
| 10 | $ 44,665.27 | $ 2,922.60 | $ 2,400.00 |
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How to use the Compound Interest Calculator
Set compounding and contributions
Choose how often interest compounds and add a regular monthly contribution if you plan to keep adding money.
See your growth
Read the future value, the total you put in, and the interest earned, then check the year by year breakdown below.
// COMPOUND INTEREST CALCULATOR · ABOUT THIS TOOL
About the Compound Interest Calculator
Compound interest is often called the most powerful force in personal finance. This calculator shows you why with your own numbers: enter a starting amount, a rate, and a time horizon to see your future value.
Add regular monthly contributions too, and the year-by-year table shows exactly when your interest starts outpacing what you put in.
Where it helps most
The calculator behind life's biggest money decisions.
Fixed deposits
Compare two fixed deposits with different rates and tenures before locking your money away for years, and compare the interest each one earns.
Retirement funds
Test whether starting a retirement fund at 25 versus 35 is really the life changing difference that everyone claims (it is, and the numbers prove it).
Education funds
Estimate how a child's education fund grows over eighteen years, and how monthly contributions stack up against a lump sum.
Monthly contributions
See how regular monthly contributions stack up against a single lump sum, watching interest eventually outpace what you put in.
Using it well
Where the real lesson hides.
Flip the frequency
Money compounded monthly grows a little faster than the same rate compounded yearly; flip between frequencies and watch the difference.
Read the yearly breakdown
The year by year breakdown shows the snowball forming: early years add modest interest, later years add chunks that dwarf your original deposit.
Watch interest overtake
Seeing interest eventually outpace your own contributions is the moment saving stops feeling abstract and starts feeling inevitable once you see the curve.
Compound Interest Calculator: built for trust
Enter your numbers and watch the snowball form year by year. Instant results, ready when you are.
Compound Interest Calculator FAQs
Compound interest is interest earned on both your original money and the interest already added to it. Because each round of interest joins the balance, growth accelerates over time instead of staying flat like simple interest.