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 580 units (Dollar, Euro, Pound, etc.), from date: Aug 15, 2016, to date: Apr 17, 2017, namely for a period of 245 days (8 Months and 2 Days), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0.6%. May 18 02:08 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 01, 2020, to date: Aug 01, 2021, namely for a period of 578 days (19 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. May 18 02:06 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 440 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 0.3%. May 18 02:00 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: May 08, 2019, to date: Sep 08, 2019, namely for a period of 123 days (4 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. May 18 01:16 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 837 units (Dollar, Euro, Pound, etc.), from date: Jul 01, 2016, to date: Jun 30, 2017, namely for a period of 364 days (11 Months and 29 Days), with an annual simple flat interest rate of 2.7% if the commission fee (withdrawal) is 0.15%. May 18 01:15 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, 0832, to date: May 23, 2017, namely for a period of 432,742 days (14,217 Months and 22 Days), with an annual simple flat interest rate of 2.2% if the commission fee (withdrawal) is 0.7%. May 18 01:07 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, 0832, to date: May 23, 2017, namely for a period of 432,742 days (14,217 Months and 22 Days), with an annual simple flat interest rate of 2.2% if the commission fee (withdrawal) is 0.7%. May 18 01:07 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%. May 18 00:57 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 15, 2019, to date: Apr 15, 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%. May 18 00:55 UTC (GMT)
Calculate the principal, initial money amount lent, deposited or borrowed in order to earn a due interest of 204.56 units (Dollar, Euro, Pound, etc.), from date: Apr 19, 2018, to date: Apr 19, 2028, namely for a period of 3,653 days (120 Months), with an annual simple flat interest rate of 4% if the commission fee (withdrawal) is 0%. May 18 00:47 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) is 0%. May 18 00:45 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: May 23, 0568, to date: Aug 01, 2016, namely for a period of 528,941 days (17,379 Months without 22 Days), with an annual simple flat interest rate of 2.2% if the commission fee (withdrawal) is 0.7%. May 18 00:17 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: May 08, 2019, to date: Dec 08, 2019, namely for a period of 214 days (7 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. May 18 00:05 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.