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 367 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jun 28, 2017, to date: Aug 28, 2017, namely for a period of 61 days (2 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%. May 26 05:50 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 1,250 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Mar 08, 2018, to date: Apr 08, 2019, namely for a period of 396 days (13 Months), with an annual simple flat interest rate of 4.3% if the commission fee (withdrawal or payment) is 0%. May 26 05:22 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, Yen, Pound, Franc, etc.), from date: Jun 08, 2017, to date: Jul 08, 2017, namely for a period of 30 days, with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%. May 26 04:23 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 100 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Mar 01, 2017, to date: Apr 01, 2017, 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%. May 26 04:10 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 7,509 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Mar 21, 2012, to date: Oct 13, 2018, namely for a period of 2,397 days (79 Months without 8 Days), with an annual simple flat interest rate of 7.5% if the commission fee (withdrawal or payment) is 0%. May 26 03:04 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 400 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jun 28, 2017, to date: Aug 28, 2017, namely for a period of 61 days (2 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%. May 26 02:45 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 100,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jan 04, 2018, to date: Feb 04, 2018, namely for a period of 31 days, with an annual simple flat interest rate of 0.95% if the commission fee (withdrawal or payment) is 0%. May 25 20:36 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 140,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Apr 29, 2018, to date: May 29, 2025, namely for a period of 2,587 days (85 Months), with an annual simple flat interest rate of 9% if the commission fee (withdrawal or payment) is 0%. May 25 20:05 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 10 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jul 03, 2016, to date: Aug 03, 2016, namely for a period of 31 days, with an annual simple flat interest rate of 2.94% if the commission fee (withdrawal or payment) is 0%. May 25 18:58 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 100 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: May 27, 2017, to date: Jun 27, 2017, 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%. May 25 18:32 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, Yen, Pound, Franc, etc.), from date: Aug 10, 2017, to date: Oct 30, 2017, namely for a period of 81 days (2 Months and 20 Days), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 0%. May 25 16:25 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 500 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Aug 24, 2016, to date: Nov 14, 2017, namely for a period of 447 days (15 Months without 10 Days), with an annual simple flat interest rate of 0.8% if the commission fee (withdrawal or payment) is 0.8%. May 25 14:22 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 136,440 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Aug 01, 2016, to date: Dec 31, 2016, namely for a period of 152 days (4 Months and 30 Days), with an annual simple flat interest rate of 14,508% if the commission fee (withdrawal or payment) is 0%. May 25 12:43 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.