Compound interest calculator
FinanceProject the final balance of an investment with monthly, quarterly or annual compounding.
Your results
Project how an initial capital grows with compound interest.
How the projection is calculated
We use the compound interest formula A = P · (1 + r/n)^(n·t), where P is the initial capital, r the annual rate, n the number of compounding periods per year and t the years.
Choosing the compounding frequency
The more frequent the compounding, the higher the final balance for the same nominal rate. Daily compounding gives a slightly better result than annual compounding.
Frequently asked questions
Answers to the most common questions about this tool.
How is this result calculated?
It applies the relevant financial formula to the amounts, terms, and rates you enter.
Does the result include every cost?
Not necessarily; fees, taxes, insurance, and third-party charges may be excluded.
Can I use this as a final financial quote?
No. Use it to compare scenarios and confirm final terms with the relevant provider.
What information do I need to enter?
Enter amounts, rates, and time periods consistently.
What assumptions does the calculation make?
It assumes the values you enter remain constant for the selected scenario.
Sources and methodology
Methodology: Compound interest
Applies A = P × (1 + r/n)^(n×t) using the selected frequency.
Assumes a constant rate and does not include taxes, fees, or inflation.
References
Last reviewed
July 15, 2026