Online calculator: calculate the due simple flat rate interest

Calculate simple flat rate interest on a principal borrowed, lent

Simple flat rate interest = (Principal × Annual simple flat interest rate × Duration in days) ÷ Number of days in a year

Latest calculated simple flat rate interest values

Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1 units (Dollar, Euro, Pound, etc.), from date: Jan 01, 2022, to date: Jan 01, 5000, namely for a period of 1,087,692 days (35,736 Months), with an annual simple flat interest rate of 15% if the commission fee (withdrawal) is 498%. Jun 27 05:47 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 500 units (Dollar, Euro, Pound, etc.), from date: Jul 21, 2017, to date: Aug 21, 2017, namely for a period of 31 days, with an annual simple flat interest rate of 20% if the commission fee (withdrawal) is 0%. Jun 27 05:44 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 95,000 units (Dollar, Euro, Pound, etc.), from date: Feb 01, 2018, to date: Feb 01, 2023, namely for a period of 1,826 days (60 Months), with an annual simple flat interest rate of 9% if the commission fee (withdrawal) is 0%. Jun 27 05:44 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Pound, etc.), from date: Dec 09, 2016, to date: Jan 09, 2017, namely for a period of 31 days, with an annual simple flat interest rate of 3% if the commission fee (withdrawal) is 128%. Jun 27 05:43 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 10,000 units (Dollar, Euro, Pound, etc.), from date: Jan 31, 2019, to date: Jul 28, 2019, namely for a period of 178 days (6 Months without 3 Days), with an annual simple flat interest rate of 0.15% if the commission fee (withdrawal) is 0%. Jun 27 05:42 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of - 1,650 units (Dollar, Euro, Pound, etc.), from date: Apr 21, 0406, to date: Apr 21, 2022, namely for a period of 590,232 days (19,392 Months), with an annual simple flat interest rate of 492% if the commission fee (withdrawal) is 0%. Jun 27 05:42 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 0 units (Dollar, Euro, Pound, etc.), from date: Feb 28, 2017, to date: Feb 10, 2018, namely for a period of 347 days (12 Months without 18 Days), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 414%. Jun 27 05:42 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 824 units (Dollar, Euro, Pound, etc.), from date: Jan 24, 2018, to date: Feb 24, 2018, namely for a period of 31 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Jun 27 05:41 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of - 1,650 units (Dollar, Euro, Pound, etc.), from date: Apr 21, 0490, to date: Apr 21, 0976, namely for a period of 177,508 days (5,832 Months), with an annual simple flat interest rate of 0.01% if the commission fee (withdrawal) is 0%. Jun 27 05:41 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 0 units (Dollar, Euro, Pound, etc.), from date: Jan 01, 2019, to date: Dec 17, 2019, namely for a period of 350 days (11 Months and 16 Days), with an annual simple flat interest rate of 730% if the commission fee (withdrawal) is 328%. Jun 27 05:30 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 0 units (Dollar, Euro, Pound, etc.), from date: Feb 03, 2017, to date: Feb 04, 2018, namely for a period of 366 days (12 Months and 1 Day), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 0%. Jun 27 05:29 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 12,500 units (Dollar, Euro, Pound, etc.), from date: Apr 18, 2018, to date: Apr 18, 2022, namely for a period of 1,461 days (48 Months), with an annual simple flat interest rate of 24.41% if the commission fee (withdrawal) is 0%. Jun 27 05:29 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1 units (Dollar, Euro, Pound, etc.), from date: Mar 11, 0478, to date: Feb 11, 0742, namely for a period of 96,395 days (3,167 Months), with an annual simple flat interest rate of 0.03% if the commission fee (withdrawal) is 0%. Jun 27 05:27 UTC (GMT)
All users calculated simple flat rate interest values


Simple flat rate interest.

Interest

  • When someone lends money to someone else, the borrower usually pays a fee to the lender. So the due interest is a sum paid or charged for the use of money or for borrowing money. The interest depends on: 1) the period of the loan 2) the amount of money lent or borrowed (called principal) and 3) the interest rate (the percentage of the principal charged as interest).
  • For example, for some bank deposits is not uncommon to pay an interest rate of 3.5% on the principal, annualy. Banks are also using these temporarily owned amounts of money by introducing them back into the cash flow circuit or are granting loans (for investments, for example) on which they are again charging interest.

Annual simple flat interest rate

  • The simple annual interest rate, or the percentage of the principal charged as interest for a period of one year, shows us that for an amount of 100 units (ex: Dollar, Euro, Yen, Pound, Franc), in a year, the interest is calculated as a percentage p% of the principal: I = p% × 100 units.
  • A deposit of S units generates a one year simple interest of: I = S × p% units, and in n years, the same deposit of S units generates an interest of: I = S × p% × n units.

Annual simple flat rate interest formula:

  • I = S × p% × n

  • I = n years simple flat rate 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

Examples of how the simple flat rate interest formula works:

  • 1) What interest, I, generates in n = 5 years a principal of S = 20,000 units if the annual simple flat interest rate is p% = 3.5%?
    Answer:
    I = S × p% × n = 20,000 × 3.5% × 5 = 20,000 × 3.5 ÷ 100 × 5 = 1,000 × 3.5 = 3,500 units
  • 2) What is the simple flat interest rate, p%, if a principal of S = 12,000 units is charged a n = 6 years interest of I = 2,880 units?
    Answer:
    I = S × p% × n =>
    p% = I ÷ (S × n) = 2,880 ÷ (12,000 × 6) = 0.04 = 4%.

Annual simple flat rate interest formula calculated for a period of n years:

  • Interest, I = S × p% × n
  • Principal, S = I ÷ (p% × n)
  • Interest rate, p% = I ÷ (S × n)
  • Number of years (period): n = I ÷ (S × p%)

Annual simple flat rate interest formula calculated for a period of m months:

  • Interest, I = (S × p% × m) ÷ 12
  • Principal, S = (12 × I) ÷ (p% × m)
  • Interest rate, p% = (12 × I) ÷ (S × m)
  • Number of months of the period, m = (12 × I) ÷ (S × p%)

Annual simple flat rate interest formula calculated for a period of d days:

  • Interest, I = (S × p% × d) ÷ 365
  • Principal, S = (365 × I) ÷ (p% × d)
  • Simple flat interest rate, p% = (365 × I) ÷ (S × d)
  • Number of days of the period, d = (365 × I) ÷ (S × p%)

More examples of how the simple flat rate interest formula works:

  • 1) Calculate the due interest on a principal of S = 400 units in m = 5 months, with a simple flat interest rate of p% = 4%.
    Answer:
    I = (S × p% × m) ÷ 12 = (400 × 4% × 5) ÷ 12 = (400 × 4 ÷ 100 × 5) ÷ 12 = 16 × 5 ÷ 12 = 20 ÷ 3 = 6.67 units
  • 2) Calculate the due interest generated by a principal of S = 400 units in m = 5 months if the simple flat interest rate of p% = 4.5%.
    Answer:
    I = (S × p% × m) ÷ 12 = (400 × 4.5% × 5) ÷ 12 = (400 × 4.5 ÷ 100 × 5) ÷ 12 = 18 × 5 ÷ 12 = 15 ÷ 2 = 7.5 units.