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 200 units (Dollar, Euro, Pound, etc.), from date: Apr 08, 2019, to date: Jul 08, 2019, namely for a period of 91 days (3 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. Jun 25 07:45 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 9,000 units (Dollar, Euro, Pound, etc.), from date: Jul 10, 2017, to date: Jul 10, 2019, namely for a period of 730 days (24 Months), with an annual simple flat interest rate of 1.75% if the commission fee (withdrawal or payment) is 0%. Jun 25 07:41 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 123,000 units (Dollar, Euro, Pound, etc.), from date: Jul 04, 2018, to date: Aug 04, 2018, namely for a period of 31 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. Jun 25 07:10 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 1,072 units (Dollar, Euro, Pound, etc.), from date: Aug 01, 2016, to date: Feb 28, 2017, namely for a period of 211 days (6 Months and 27 Days), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 1%. Jun 25 07:06 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: Feb 08, 2019, to date: Mar 08, 2019, namely for a period of 28 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. Jun 25 07:00 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 08, 2019, to date: Apr 08, 2019, namely for a period of 59 days (2 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. Jun 25 06:46 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 4,000 units (Dollar, Euro, Pound, etc.), from date: Jul 16, 2016, to date: Aug 16, 2016, namely for a period of 31 days, with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%. Jun 25 06:40 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 1,325 units (Dollar, Euro, Pound, etc.), from date: Apr 11, 2019, to date: May 11, 2019, namely for a period of 30 days, with an annual simple flat interest rate of 182.5% if the commission fee (withdrawal or payment) is 0%. Jun 25 06:32 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 or payment) is 0.3%. Jun 25 06:28 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 855 units (Dollar, Euro, Pound, etc.), from date: Apr 12, 2019, to date: Jul 25, 2019, namely for a period of 104 days (3 Months and 13 Days), with an annual simple flat interest rate of 730% if the commission fee (withdrawal or payment) is 0%. Jun 25 06:28 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 15, 2019, to date: Aug 15, 2019, namely for a period of 122 days (4 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. Jun 25 06:16 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 3 units (Dollar, Euro, Pound, etc.), from date: Sep 12, 2018, to date: Feb 15, 2019, namely for a period of 156 days (5 Months and 3 Days), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. Jun 25 05:43 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 14,400 units (Dollar, Euro, Pound, etc.), from date: Jan 01, 2008, to date: Dec 31, 2016, namely for a period of 3,287 days (107 Months and 30 Days), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. Jun 25 05:32 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.