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 500 units (Dollar, Euro, Pound, etc.), from date: Dec 24, 2016, to date: Dec 14, 2017, namely for a period of 355 days (12 Months without 10 Days), with an annual simple flat interest rate of 0.8% if the commission fee (withdrawal) is 0.8%. Jun 27 04:45 UTC (GMT)
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) is 0%. Jun 27 04:04 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) is 0%. Jun 27 03:17 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: Apr 08, 2019, to date: Aug 08, 2019, namely for a period of 122 days (4 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Jun 27 01:35 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 10,000 units (Dollar, Euro, Pound, etc.), from date: Jul 19, 2020, to date: Aug 19, 2020, namely for a period of 31 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Jun 27 01:33 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 100 units (Dollar, Euro, Pound, etc.), from date: Jan 11, 0554, to date: Jan 11, 2016, namely for a period of 533,984 days (17,544 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal) is 0%. Jun 27 01:12 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 3,000 units (Dollar, Euro, Pound, etc.), from date: Nov 03, 2018, to date: Dec 03, 2018, namely for a period of 30 days, with an annual simple flat interest rate of 1.25% if the commission fee (withdrawal) is 0%. Jun 27 01:09 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: Nov 30, 2018, to date: Nov 30, 2020, namely for a period of 731 days (24 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal) is 0%. Jun 26 19:27 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 7.471 units (Dollar, Euro, Pound, etc.), from date: Dec 20, 2012, to date: Dec 31, 2018, namely for a period of 2,202 days (72 Months and 11 Days), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Jun 26 18:34 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 150 units (Dollar, Euro, Pound, etc.), from date: May 12, 2018, to date: Jun 12, 2018, namely for a period of 31 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Jun 26 16:12 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 72,000 units (Dollar, Euro, Pound, etc.), from date: Jan 01, 2019, to date: Oct 01, 2019, namely for a period of 273 days (9 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Jun 26 15:49 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: Feb 15, 2019, to date: Apr 15, 2019, namely for a period of 59 days (2 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Jun 26 15:20 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 1,500 units (Dollar, Euro, Pound, etc.), from date: May 27, 0252, to date: Dec 27, 2018, namely for a period of 645,232 days (21,199 Months), with an annual simple flat interest rate of 1% if the commission fee (withdrawal) is 0.2%. Jun 26 15:08 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.