Simple (Flat Rate) Interest Calculator: Calculate the Principal (Initial Starting Amount of Money) To Be Lent, Deposited or Borrowed With a Simple (Flat) Interest Rate in Order To Produce a Certain Sum of Money by the Investment Duration Period and Transaction Fee

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)

The latest initial amounts of money calculated for earning certain simple flat rate interest amounts

Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 14,203 units (Dollar, Euro, Pound, etc.) for a period of 5,872 days (24,193 Months), if the annual simple (flat rate) interest is 0.7%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 10,954 units (Dollar, Euro, Pound, etc.) for a period of 31 days, if the annual simple (flat rate) interest is 2%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 5,842.5 units (Dollar, Euro, Pound, etc.) for a period of 635,731 days (20,887 Months without 3 Days), if the annual simple (flat rate) interest is 1%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 7,384 units (Dollar, Euro, Pound, etc.) for a period of 635,731 days (20,887 Months without 3 Days), if the annual simple (flat rate) interest is 1%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 13,672 units (Dollar, Euro, Pound, etc.) for a period of 365 days (12 Months), if the annual simple (flat rate) interest is 1% and the transaction fee is 0.5%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 7,835.34 units (Dollar, Euro, Pound, etc.) for a period of 462,553 days (15,197 Months and 3 Days), if the annual simple (flat rate) interest is 1%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 99,373 units (Dollar, Euro, Pound, etc.) for a period of 1,826 days (60 Months), if the annual simple (flat rate) interest is 1%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 4,883.67 units (Dollar, Euro, Pound, etc.) for a period of 1,095 days (36 Months), if the annual simple (flat rate) interest is 3% and the transaction fee is 10%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 6,495.12 units (Dollar, Euro, Pound, etc.) for a period of 635,731 days (20,887 Months without 3 Days), if the annual simple (flat rate) interest is 1%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 16,539 units (Dollar, Euro, Pound, etc.) for a period of 365 days (12 Months), if the annual simple (flat rate) interest is 1% and the transaction fee is 0.5%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 14,020 units (Dollar, Euro, Pound, etc.) for a period of 365 days (12 Months), if the annual simple (flat rate) interest is 1% and the transaction fee is 0.5%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 3,709.43 units (Dollar, Euro, Pound, etc.) for a period of 462,553 days (15,197 Months and 3 Days), if the annual simple (flat rate) interest is 1%. May 17 15:59 UTC (GMT)
Calculate the principal, initial money amount to be lent, deposited or borrowed in order to earn a simple (flat rate) interest of 11,455 units (Dollar, Euro, Pound, etc.) for a period of 462,553 days (15,197 Months and 3 Days), if the annual simple (flat rate) interest is 1%. May 17 15:59 UTC (GMT)
All the initial amounts of money calculated by users for earning certain simple flat rate interest amounts


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.