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Compound Interest CalculatorCalculating Interest Rate for CompoundingCalculating time required to reach goal
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Principal amount  Future amount
  

Annual interest rate  Number of times per year
%  

Number of years:
  
The formula for calculating time required to reach goal:
  t =ln(F/p)/(ln(1+r/n)n)
  • P =initial principal
  • n = number of times the interest is compounded per year
  • F = future amount after time t
  • r = annual nominal interest rate
  • t = number of years
Example usage: If you start a bank account with $1300 and your bank compounds the interest quarterly at an annual nominal interest rate is 4.8% . Your savings goal is $1900. Using the formula above, with P = 1300, F = 1900, n = 4, and r = 4.8: t=ln(1900/1300)/(ln(1+0.048/4)X4).So, the investment period is 8 years.



Top Use:    Compound Interest:Calculate time required - Principal:200 Future:10000 Interest Rate:8

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