Compound Interest Calculator
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Compound interest calculator
Compound interest earns interest on both your original amount and the interest already added. Enter an initial amount, annual rate, time period and compounding frequency to see the final value, the interest earned and a year-by-year table.
How to use the compound interest calculator
Enter the initial amount you are investing or borrowing.
Enter the annual interest rate as a percentage.
Set the time period in years and how often interest compounds.
Read the final value and the interest earned.
Real-World Example
Calculation In Practice
When compound interest matters
1
Savings and deposits: Compare annual, monthly and daily compounding.
2
Long-term investing: See how time multiplies growth.
3
Debt: Understand how unpaid interest grows.
Frequently Asked Questions
What is the compound interest formula?
A = P (1 + r/n)^(n t), where P is the initial amount, r the annual rate, n the compounding periods per year and t the years.
Does more frequent compounding earn more?
Yes, slightly. Monthly compounding earns a little more than annual at the same rate.
Does this include regular deposits?
No. For monthly investments use the SIP calculator.
Author Spotlight
The ToolsACE Team
Last reviewed October 2026Our finance tools team builds transparent calculators with the formula shown, so you can check every number.
Financial MathematicsSoftware Engineering Team
Disclaimer
Results are mathematical estimates and not financial advice.