💰 Finance
Compound Interest Calculator
Compound interest means you earn interest on interest, so growth accelerates over time. This calculator projects the final balance of a one-off investment using the standard compounding formula, with no additional contributions.
Breakdown
Growth over time
Period-by-period schedule
| Year | Contributions | Interest | Balance |
|---|---|---|---|
| 1 | 10,000.00 | 722.90 | 10,722.90 |
| 2 | 10,000.00 | 1,498.06 | 11,498.06 |
| 3 | 10,000.00 | 2,329.26 | 12,329.26 |
| 4 | 10,000.00 | 3,220.54 | 13,220.54 |
| 5 | 10,000.00 | 4,176.25 | 14,176.25 |
| 6 | 10,000.00 | 5,201.06 | 15,201.06 |
| 7 | 10,000.00 | 6,299.94 | 16,299.94 |
| 8 | 10,000.00 | 7,478.26 | 17,478.26 |
| 9 | 10,000.00 | 8,741.77 | 18,741.77 |
| 10 | 10,000.00 | 10,096.61 | 20,096.61 |
How it works
Initial amount
Annual interest rate
Years
Compounding frequency
Final balance
Interest earned
Frequently asked questions
What is the compound interest formula?
The final amount equals P × (1 + r/n) raised to the power of n × t, where P is the principal, r is the annual rate as a decimal, n is the number of compounding periods per year and t is the number of years.
Does more frequent compounding always pay more?
Yes, but the difference narrows. Going from annual to monthly compounding on the same nominal rate adds a modest amount; the far bigger drivers are the interest rate itself and the length of time invested.