Calculator: calculate duration period of the investement (lending, borrowing, deposit) to earn a certain simple flat rate interest on the principal (starting amount) by the simple flat interest rate and additional transaction fees

Calculator: investment duration 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)

Latest calculated duration periods for borrowing, lending or investing money

Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 4,000 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 100 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%. Dec 12 12:19 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 4,000 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 20 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 1%. Dec 12 10:21 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 5,000 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 200 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0.8%. Dec 12 10:11 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 4,000 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 10 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 1%. Dec 12 09:34 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 187,000 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 15,000 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 3.5% if the commission fee (withdrawal or payment) is 0.5%. Dec 12 09:15 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 11,600 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 1,200 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 2.4% if the commission fee (withdrawal or payment) is 0.3%. Dec 12 08:30 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 750 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 20 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. Dec 12 08:10 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 150,000 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 4,000 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 2.75% if the commission fee (withdrawal or payment) is 0.25%. Dec 12 08:03 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 22,050 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 300 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0.2%. Dec 12 08:00 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 774,300 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 39,949 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0.1%. Dec 12 05:37 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 100,000 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 250 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%. Dec 12 04:43 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 99,375 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 2.5 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 2.5% if the commission fee (withdrawal or payment) is 0%. Dec 12 02:18 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 7,500 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 750 units (Dollar, Euro, Pound, etc.), with an annual simple flat interest rate of 1% if the commission fee (withdrawal or payment) is 0.3%. Dec 12 00:00 UTC (GMT)
All duration periods calculated by users


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.