Enter values and select Calculate to see your result.
Calculate interest earned with annual, monthly or daily compounding
Assumes a constant annual nominal rate with no deposits, withdrawals or taxes.
How to use the Interest Calculator
See how a balance grows when interest compounds annually, quarterly, monthly or daily without added deposits.
- Enter principal, annual rate and time.
- Choose compounding frequency.
- Calculate to compare ending balance and interest earned.
Interest Calculator formula
A = P(1 + r/n)^(nt).
Worked example
Inputs: $10,000 at 5% for 10 years with monthly compounding.
What to expect: The balance is about $16,470.09, including about $6,470.09 interest before tax or fees.
How to read your result
More frequent compounding increases the result slightly when the nominal rate and term stay the same.
Frequently asked questions
What is the difference between rate and APY?
The entered rate is nominal; APY also reflects compounding and is better for deposit comparisons.
Can I add regular deposits?
Use the investment or savings calculator for recurring contributions.