Compound Interest Calculator
How to use ?
Add Some
Currency
Interest rate
Compound frequency
Years / Months
Regular contributions
Some Calculate
Click the Calculate Button
Some Result
Interest calculation for :
Future investment value
Yearly rate → Compounded rate
Total interest earned
All-time rate of return (RoR)
Initial balance
Time needed to double investment
Summary
Monthly / yearly Breakdown
Why Use?
Why Use This Compound Interest Calculator?
What is Compound Interest?
Compound interest is a method where the interest earned gets added back to your original amount, and future interest is then calculated on this new total. This creates a cycle where your money keeps growing faster and faster over time — the longer you leave it, the bigger it gets.
How is it Calculated?
The standard formula used is: A = P(1 + r/n)^nt Where A is the final amount, P is your starting amount, r is the yearly interest rate as a decimal, n is how many times interest is added per year, and t is the total number of years.
3 Strategies to Maximize Compounding
Start Early : Even small amounts invested early grow significantly — time is the most powerful factor.
Regular Contributions : Each deposit starts earning its own interest, amplifying your overall growth.
Higher Compounding Frequency : Daily compounding earns more than yearly — the more frequent, the better.
Impact of Regular Deposits
A $10,000 investment at 5% for 20 years without deposits grows to $26,532.
Add just $100/month and it reaches $67,121 — more than double!
| Year | Interest Calculation | Interest Earned | End Balance |
|---|---|---|---|
| Year 1 | $10,000 x 5% | $500 | $10,500 |
| Year 2 | $10,500 x 5% | $525 | $11,025 |
| Year 3 | $11,025 x 5% | $551.25 | $11,576.25 |
| Year 4 | $11,576.25 x 5% | $578.81 | $12,155.06 |
| Year 5 | $12,155.06 x 5% | $607.75 | $12,762.82 |
| Year 6 | $12,762.82 x 5% | $638.14 | $13,400.96 |
| Year 7 | $13,400.96 x 5% | $670.05 | $14,071 |
| Year 8 | $14,071 x 5% | $703.55 | $14,774.55 |
| Year 9 | $14,774.55 x 5% | $738.73 | $15,513.28 |
| Year 10 | $15,513.28 x 5% | $775.66 | $16,288.95 |
| Year 11 | $16,288.95 x 5% | $814.45 | $17,103.39 |
| Year 12 | $17,103.39 x 5% | $855.17 | $17,958.56 |
| Year 13 | $17,958.56 x 5% | $897.93 | $18,856.49 |
| Year 14 | $18,856.49 x 5% | $942.82 | $19,799.32 |
| Year 15 | $19,799.32 x 5% | $989.97 | $20,789.28 |
| Year 16 | $20,789.28 x 5% | $1,039.46 | $21,828.75 |
| Year 17 | $21,828.75 x 5% | $1,091.44 | $22,920.18 |
| Year 18 | $22,920.18 x 5% | $1,146.01 | $24,066.19 |
| Year 19 | $24,066.19 x 5% | $1,203.31 | $25,269.50 |
| Year 20 | $25,269.50 x 5% | $1,263.48 | $26,532.98 |
Effective Annual Rate (EAR)
The effective annual rate tells you the actual return you are getting after compounding is applied. It will always be higher than the stated rate when compounding happens more than once a year — and the more frequently it compounds, the higher it gets.