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 7,000 units (Dollar, Euro, Pound, etc.), from date: Jun 20, 2020, to date: Jan 20, 2021, namely for a period of 214 days (7 Months), with an annual simple flat interest rate of 8% if the commission fee (withdrawal) is 0%. Apr 02 01:49 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 10,201 units (Dollar, Euro, Pound, etc.), from date: May 09, 2020, to date: May 09, 2021, namely for a period of 365 days (12 Months), with an annual simple flat interest rate of 1% if the commission fee (withdrawal) is 0%. Apr 02 01:30 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 8,600 units (Dollar, Euro, Pound, etc.), from date: Sep 13, 2021, to date: Sep 13, 2022, namely for a period of 365 days (12 Months), with an annual simple flat interest rate of 25% if the commission fee (withdrawal) is 0%. Apr 01 19:07 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: Jul 31, 0768, to date: Aug 31, 2017, namely for a period of 456,219 days (14,989 Months), with an annual simple flat interest rate of 8% if the commission fee (withdrawal) is 0%. Apr 01 18:52 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 350 units (Dollar, Euro, Pound, etc.), from date: Jul 25, 2016, to date: Aug 01, 2017, namely for a period of 372 days (13 Months without 24 Days), with an annual simple flat interest rate of 2.5% if the commission fee (withdrawal) is 320%. Apr 01 15:23 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 285 units (Dollar, Euro, Pound, etc.), from date: Aug 01, 0840, to date: May 23, 2017, namely for a period of 429,820 days (14,121 Months and 22 Days), with an annual simple flat interest rate of 2.2423418% if the commission fee (withdrawal) is 0.7%. Apr 01 14:47 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 73,959,205 units (Dollar, Euro, Pound, etc.), from date: May 17, 2012, to date: May 17, 2032, namely for a period of 7,305 days (240 Months), with an annual simple flat interest rate of 15.12% if the commission fee (withdrawal) is 0%. Apr 01 11:33 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 21, 2014, to date: Apr 21, 2019, namely for a period of 1,826 days (60 Months), with an annual simple flat interest rate of 1% if the commission fee (withdrawal) is 0%. Mar 31 17:23 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 4,000,000 units (Dollar, Euro, Pound, etc.), from date: Jan 02, 2020, to date: Feb 02, 2030, namely for a period of 3,684 days (121 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Mar 31 15:47 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 5 units (Dollar, Euro, Pound, etc.), from date: Jan 01, 2021, to date: Oct 01, 2021, namely for a period of 273 days (9 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal) is 0%. Mar 31 15:13 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 27,100 units (Dollar, Euro, Pound, etc.), from date: Jan 02, 2021, to date: Sep 02, 2021, namely for a period of 243 days (8 Months), with an annual simple flat interest rate of 12.6% if the commission fee (withdrawal) is 0%. Mar 31 10:31 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: Jan 08, 2019, to date: Apr 08, 2019, namely for a period of 90 days (3 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Mar 31 03:58 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 5 units (Dollar, Euro, Pound, etc.), from date: Jan 05, 2019, to date: Jul 05, 2019, namely for a period of 181 days (6 Months), with an annual simple flat interest rate of 100% if the commission fee (withdrawal) is 0%. Mar 30 20:47 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.