ToolNova

💰 Compound Interest Calculator — Future Value & Interest

Enter the principal, annual interest rate, number of years and compounding frequency. The tool shows the future value, total interest earned and a simple year-by-year balance.

Finance Free · no sign-up Added 2026-10-12
Input
Result
Results
Year-by-year balance 

  


        

      

    

    

      
      Private by design. This tool runs entirely in your browser — nothing you enter or add is uploaded to any server.
    

  


  

    
How it works

    
    
      
  1. The standard compound interest formula A = P × (1 + r/n)^(n×t) is applied, where r is the annual rate as a decimal and n is the compounding periods per year.
    2. 
      
  2. Future value A includes principal plus all compounded interest. Total interest earned is A minus P.
    3. 
      
  3. A year-by-year schedule shows the balance at the end of each complete year using the same rate and frequency.
    4. 
    


    
Examples

    
    
      
  • $10,000 at 5% compounded yearly for 10 years becomes approximately $16,288.95.
    • 
      
  • The same $10,000 at 5% compounded monthly for 10 years becomes approximately $16,470.09.
    • 
      
  • At 8% yearly for 5 years on $5,000 the future value is about $7,346.64.
    • 
    


    
Frequently asked questions

    

  

    Which compounding frequencies can I choose?
    
Yearly (once a year), half-yearly, quarterly, monthly and daily (365 times per year).

  

  

    How are partial years handled?
    
The final future value uses the exact fractional years you enter. The schedule only lists complete years.

  

  

    Is the calculation accurate for large numbers?
    
Yes, within normal JavaScript number precision. Results are shown to two decimal places.

  



  


  

    

      
      More Finance tools →