Calculator: calculate the amount of initial money to be lent, deposited or borrowed (principal) in order to earn a simple flat rate due interest by the interest rate, duration and additional transaction fees (withdrawal, payment in advance)

Calculate principal amount to invest to get a certain simple flat rate interest

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

Latest calculated initial amounts of money (principal) for earning certain simple flat rate interest values

Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 868 units (Dollar, Euro, Pound, etc.), from date: Jan 10, 2017, to date: Jul 10, 2017, namely for a period of 181 days (6 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 0%. Feb 24 20:59 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 4,800 units (Dollar, Euro, Pound, etc.), from date: Oct 01, 2020, to date: Dec 20, 2020, namely for a period of 80 days (2 Months and 19 Days), with an annual simple flat interest rate of 12% if the commission fee (withdrawal or payment) is 0%. Feb 24 20:23 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 100,074,690 units (Dollar, Euro, Pound, etc.), from date: Apr 29, 2018, to date: May 29, 2018, namely for a period of 30 days, with an annual simple flat interest rate of 3.5% if the commission fee (withdrawal or payment) is 0%. Feb 24 20:11 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 30,000,000 units (Dollar, Euro, Pound, etc.), from date: May 26, 2020, to date: Sep 26, 2020, namely for a period of 123 days (4 Months), with an annual simple flat interest rate of 16% if the commission fee (withdrawal or payment) is 0%. Feb 24 19:48 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 174,688,702 units (Dollar, Euro, Pound, etc.), from date: May 17, 2017, to date: May 17, 2037, namely for a period of 7,305 days (240 Months), with an annual simple flat interest rate of 10.13% if the commission fee (withdrawal or payment) is 0%. Feb 24 19:38 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 10.499 units (Dollar, Euro, Pound, etc.), from date: Jun 24, 2017, to date: Nov 24, 2018, namely for a period of 518 days (17 Months), with an annual simple flat interest rate of 12% if the commission fee (withdrawal or payment) is 0%. Feb 24 18:21 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 7,000 units (Dollar, Euro, Pound, etc.), from date: Jul 01, 2016, to date: Dec 01, 2017, namely for a period of 518 days (17 Months), with an annual simple flat interest rate of 1.5% if the commission fee (withdrawal or payment) is 0.2%. Feb 24 18:15 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 1,000 units (Dollar, Euro, Pound, etc.), from date: Apr 29, 2018, to date: May 29, 2018, namely for a period of 30 days, with an annual simple flat interest rate of 13.5% if the commission fee (withdrawal or payment) is 0%. Feb 24 18:10 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 200 units (Dollar, Euro, Pound, etc.), from date: Mar 08, 2019, to date: May 08, 2019, namely for a period of 61 days (2 Months), with an annual simple flat interest rate of 5,339% if the commission fee (withdrawal or payment) is 0%. Feb 24 18:07 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 1,230,000 units (Dollar, Euro, Pound, etc.), from date: Aug 23, 2016, to date: Dec 31, 2018, namely for a period of 860 days (28 Months and 8 Days), with an annual simple flat interest rate of 1% if the commission fee (withdrawal or payment) is 0.5%. Feb 24 18:06 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 200 units (Dollar, Euro, Pound, etc.), from date: Mar 08, 2019, to date: May 08, 2019, namely for a period of 61 days (2 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. Feb 24 17:50 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 5,000 units (Dollar, Euro, Pound, etc.), from date: Aug 01, 2016, to date: Aug 01, 2017, namely for a period of 365 days (12 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 1%. Feb 24 17:34 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 200,000 units (Dollar, Euro, Pound, etc.), from date: Dec 14, 2018, to date: Dec 14, 2020, namely for a period of 731 days (24 Months), with an annual simple flat interest rate of 4.5% if the commission fee (withdrawal or payment) is 0%. Feb 24 17:21 UTC (GMT)
All initial amounts of money calculated by users for earning certain simple flat rate interest values


How to calculate the principal - initial amount of money lent, deposited or borrowed in order to collect or pay a simple flat rate due interest by the interest rate, duration and additional fees (transaction fee as withdrawal, payment in advance, etc.).

Annual simple flat rate interest calculation formula:

  • I = S × p% × n

  • I = n years simple interest charged
  • S = 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 for the principal - initial amount of money lent, deposited or borrowed in order to produce a simple flat annual rate:

  • S = I ÷ (p% × n)

Examples of how to calculate the initial amount, the principal, to earn a certain simple flat rate interest:

  • 1) What is the principal that has to be lent, deposited or borrowed for a period of n = 5 years if the simple flat rate interest collected or paid D = 3,500 units, for an annual simple flat interest rate (percentage) p% = 3.5%?
    Answer:
    S = I ÷ (p% × n) = 3,500 ÷ (3.5% × 5) = 3,500 ÷ (3.5/100 × 5) = (3,500 × 100) ÷ (3.5 × 5) = 350,000 ÷ 17.5 = 20,000 units
  • 2) What is the principal that has to be lent, deposited or borrowed for a period of n = 3 years if the simple flat rate interest collected or paid D = 300 units, for an annual simple flat interest rate p% = 2%?
    Answer:
    S = I ÷ (p% × n) = 300 ÷ (2% × 3) = 300 ÷ (2/100 × 3) = (300 × 100) ÷ (2 × 3) = 30,000 ÷ 6 = 5,000 units

Annual simple flat rate interest formula calculated for a period of n years:

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

The principal formula for earning an annual simple flat rate interest calculated for a period of m months:

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

The principal formula for earning an annual simple flat rate interest calculated for a period of d days:

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

More examples of how to calculate the principal for earning a simple flat rate interest:

  • 1) Calculate the initial amount S that would generate a simple flat rate interest I = 6.67 units in m = 5 months with a simple interest rate of p% = 4%.
    Answer:
    S = (12 × I) ÷ (p% × m) = (12 × 6.67) ÷ (4% × 5) = (12 × 6.67) ÷ (4/100 × 5) = (100 × 12 × 6.67) ÷ (4 × 5) = (100 × 12 × 6.67) ÷ 20 = 5 × 12 × 6.67 = 400.2 ≈ 400 units
  • 2) Calculate the initial amount that would earn a simple flat rate interest I = 7.5 units in m = 5 months with a simple flat interest rate of p% = 4.5%.
    Answer:
    S = (12 × I) ÷ (p% × m) = (12 × 7.5) ÷ (4.5% × 5) = (100 × 12 × 7.5) ÷ (4.5 × 5) = (100 × 12 × 7.5) ÷ 22.5 = 9,000 ÷ 22.5 = 400 units.