Calculate the Duration Period of a Loan or Deposit, So That it Yields a Certain Sum of Money as Simple Interest

Investment duration calculator for earning a due simple flat rate interest

Duration in days = (Simple flat rate interest × Number of days in a year) ÷ (Principal × Annual simple flat interest rate)

The latest calculated duration periods of investments

Calculate the duration period for the principal amount borrowed, deposited or lent, of 4,779 units (Dollar, Euro, Pound) to produce a simple interest of 625. Simple interest rate: 5% Sep 13 17:40 UTC (GMT)
Calculate the duration period for the principal amount borrowed, deposited or lent, of 17,010 units (Dollar, Euro, Pound) to produce a simple interest of 399. Simple interest rate: 1%. Transaction fee: 2.8% Sep 13 17:38 UTC (GMT)
Calculate the duration period for the principal amount borrowed, deposited or lent, of 681 units (Dollar, Euro, Pound) to produce a simple interest of 464. Simple interest rate: 1%. Transaction fee: 4% Sep 13 17:30 UTC (GMT)
Calculate the duration period for the principal amount borrowed, deposited or lent, of 21,450 units (Dollar, Euro, Pound) to produce a simple interest of 4.64. Simple interest rate: 1.174%. Transaction fee: 0.8% Sep 13 17:22 UTC (GMT)
Calculate the duration period for the principal amount borrowed, deposited or lent, of 156 units (Dollar, Euro, Pound) to produce a simple interest of 153. Simple interest rate: 2%. Transaction fee: 1% Sep 13 16:49 UTC (GMT)
Calculate the duration period for the principal amount borrowed, deposited or lent, of 8,715 units (Dollar, Euro, Pound) to produce a simple interest of 683. Simple interest rate: 5% Sep 13 16:45 UTC (GMT)
Calculate the duration period for the principal amount borrowed, deposited or lent, of 110,599 units (Dollar, Euro, Pound) to produce a simple interest of 453. Simple interest rate: 7% Sep 13 16:39 UTC (GMT)
Calculate the duration period for the principal amount borrowed, deposited or lent, of 767 units (Dollar, Euro, Pound) to produce a simple interest of 174. Simple interest rate: 8% Sep 13 16:39 UTC (GMT)
Calculate the duration period for the principal amount borrowed, deposited or lent, of 6,707 units (Dollar, Euro, Pound) to produce a simple interest of 827. Simple interest rate: 5% Sep 13 16:38 UTC (GMT)
Calculate the duration period for the principal amount borrowed, deposited or lent, of 4,927 units (Dollar, Euro, Pound) to produce a simple interest of 141. Simple interest rate: 7.5% Sep 13 16:35 UTC (GMT)
» Monthly Tables: Durations Calculated For Principal Amounts Borrowed, Deposited or Lent To Yield Certain Simple Interest Amounts


How to calculate duration (period) of a deposit, borrowing or lending, in order to collect or pay a certain simple flat rate interest by the principal (initial starting amount of money), simple flat interest rate and additional transaction fees (withdrawal, payment in advance, etc.).

Annual simple flat rate interest formula:

  • I = P × p% × n

  • I = n years simple flat rate interest charged
  • P = initial amount (principal)
  • p% = annual simple flat interest rate (percentage of the principal charged as interest)
  • n = number of years of the lending or borrowing the money

  • Formula of the duration of a deposit, borrowing or lending, applied to the principal - initial starting amount of money lent, deposited or borrowed - in order to earn a simple flat rate interest:

  • n = I ÷ (P × p%)

Examples of how to calculate the duration of a deposit, borrowing or lending, for earning a due simple flat rate interest:

  • 1) For how many n years a bank account should be open if the initial starting amount of money that has to be lent, deposited or borrowed, the principal, P = 20,000 units produced a simple flat rate interest (collected or paid) D = 3,500 units with an annual simple flat interest rate of p% = 3.5%?
    Answer:
    n = I ÷ (P × p%) = 3,500 ÷ (20,000 × 3.5%) = 3,500 ÷ (20,000 × 3.5/100) = (100 × 3,500) ÷ (20,000 × 3.5) = 350,000 ÷ 70,000 = 35 ÷ 7 = 5 years;
  • 2) For how many n years a bank account should be open if the initial starting amount of money that has to be lent, deposited or borrowed, the principal, P = 5,000 units produced a simple flat rate interest (collected or paid) D = 300 units with an annual simple flat interest rate of p% = 2%?
    Answer:
    n = I ÷ (P × p%) = 300 ÷ (5,000 × 2%) = 300 ÷ (5,000 × 2/100) = (100 × 300) ÷ (5,000 × 2) = 30,000 ÷ 10,000 = 3 years;

Duration (period) of a simple flat interest rate investment formula calculated for a period of n years:

  • Number of years of the period of the deposit, lending or borrowing, n = I ÷ (P × p%)
  • Simple flat rate interest, I = P × p% × n
  • Principal, P = I ÷ (p% × n)
  • Simple flat interest rate, p% = I ÷ (P × n)

Duration (period) of a simple flat interest rate investment formula calculated for a period of m months:

  • Number of months of the period, m = (12 × I) ÷ (P × p%)
  • Simple flat rate interest, I = (P × p% × m) ÷ 12
  • Principal, P = (12 × I) ÷ (p% × m)
  • Simple flat interest rate, p% = (12 × I) ÷ (P × m)

Duration (period) of a simple flat interest rate investment formula calculated for a period of d days:

  • Number of days of the period, d = (365 × I) ÷ (P × p%)
  • Simple flat rate interest, I = (P × p% × d) ÷ 365
  • Principal, P = (365 × I) ÷ (p% × d)
  • Simple flat interest rate, p% = (365 × I) ÷ (P × d)

More examples on how the duration of a deposit, borrowing or lending for earning a certain simple flat rate interest formula works:

  • 1) Calculate the duration (period), m, in months, of a banking deposit account with an initial starting amount (principal) P = 400 units that would generate a simple flat rate interest I = 6.67 units with a simple flat interest rate p% = 4.5%.
    Answer:
    m = (12 × I) ÷ (P × p%) = (12 × 6.67) ÷ (400 × 4.5%) = (12 × 6.67) ÷ (400 × 4.5/100) = (100 × 12 × 6.67) ÷ (400 × 4.5) = (3 × 6.67) ÷ 4.5 = 5 months;
  • 2) Calculate the duration (period), m, in months, of a banking deposit account with an initial starting amount (principal) P = 400 units that would generate a simple flat rate interest I = 7.5 units with a simple flat interest rate p% = 4.5%.
    Answer:
    m = (12 × I) ÷ (P × p%) = (12 × 7.5) ÷ (400 × 4.5%) = (12 × 7.5) ÷ (400 × 4.5/100) = (100 × 12 × 7.5) ÷ (400 × 4.5) = (3 × 7.5) ÷ 4.5 = 22.5 ÷ 4.5 = 5 months.