Principal and rate
Start with an initial amount and an annual interest-rate assumption. The projected result changes as you adjust either input.
Free online calculator
Compound Interest Calculator
Explore how principal, interest rate, time and compounding frequency can affect projected growth. Use the calculator to test monthly, quarterly and yearly compounding assumptions.
Open CalculatorHow this calculator helps
Time matters
A longer investment period gives compounding more opportunities to add earned interest to the balance.
Compounding frequency
Compare monthly, quarterly and yearly compounding assumptions to see how the timing of interest additions changes the projection.
Important: Results are estimates for education and planning. Actual rates, taxation, compounding methods and product terms may vary by financial institution and applicable rules.
Frequently Asked Questions
What is compound interest?
Compound interest means that interest earned is added to the balance, so later interest calculations can include previously earned interest.
Does more frequent compounding always change the result?
For the same nominal rate and other assumptions, changing the compounding frequency can change the calculated result because interest is added at different intervals.
Can I use this for an FD?
Yes. The main calculator can be used for FD-style lump-sum calculations as well as other deposit scenarios.