Simple (Flat Rate) Interest Calculator: Calculate the Investment Duration Period of an Initial Starting Amount of Money (the Principal Borrowed, Deposited or Lent) To Produce a Certain Sum of Money by the Annual Simple (Flat) Interest Rate and Transaction Fee

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)

The latest calculated duration periods of the investments

Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 475 units (Dollar, Euro, Pound, etc.) to produce an amount of 180 units, if the annual simple (flat) interest rate is 7%. Nov 20 12:41 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 730 units (Dollar, Euro, Pound, etc.) to produce an amount of 181 units, if the annual simple (flat) interest rate is 3%. Nov 20 12:41 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 4,487 units (Dollar, Euro, Pound, etc.) to produce an amount of 60 units, if the annual simple (flat) interest rate is 7.5%. Nov 20 12:41 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 81 units (Dollar, Euro, Pound, etc.) to produce an amount of 274 units, if the annual simple (flat) interest rate is 2%. The transaction fee is 1%. Nov 20 12:41 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 965,130,600,000 units (Dollar, Euro, Pound, etc.) to produce an amount of 407 units, if the annual simple (flat) interest rate is 9%. Nov 20 12:40 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 99,918 units (Dollar, Euro, Pound, etc.) to produce an amount of 101 units, if the annual simple (flat) interest rate is 7%. Nov 20 12:40 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 198 units (Dollar, Euro, Pound, etc.) to produce an amount of 182 units, if the annual simple (flat) interest rate is 2%. Nov 20 12:40 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 10,613 units (Dollar, Euro, Pound, etc.) to produce an amount of 257 units, if the annual simple (flat) interest rate is 1%. The transaction fee is 218,039%. Nov 20 12:40 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 29 units (Dollar, Euro, Pound, etc.) to produce an amount of 800 units, if the annual simple (flat) interest rate is 5%. Nov 20 12:40 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 3,673 units (Dollar, Euro, Pound, etc.) to produce an amount of 67 units, if the annual simple (flat) interest rate is 7.5%. Nov 20 12:40 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 153 units (Dollar, Euro, Pound, etc.) to produce an amount of 1 units, if the annual simple (flat) interest rate is 7%. Nov 20 12:40 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 92,972 units (Dollar, Euro, Pound, etc.) to produce an amount of 1,722 units, if the annual simple (flat) interest rate is 6%. The transaction fee is 0.25%. Nov 20 12:40 UTC (GMT)
Calculate the investment duration period, in days, of the initial starting amount (the principal borrowed, deposited or lent), of 612 units (Dollar, Euro, Pound, etc.) to produce an amount of 0 units, if the annual simple (flat) interest rate is 7%. Nov 20 12:40 UTC (GMT)
All the investments 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.