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 0 units (Dollar, Euro, Pound, etc.), from date: Jun 24, 0670, to date: May 24, 2017, namely for a period of 491,951 days (16,163 Months), with an annual simple flat interest rate of 816% if the commission fee (withdrawal) is 0%. Sep 16 19:09 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 698 units (Dollar, Euro, Pound, etc.), from date: Jun 18, 0296, to date: May 18, 0330, namely for a period of 12,386 days (407 Months), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 0%. Sep 16 19:09 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,000 units (Dollar, Euro, Pound, etc.), from date: Oct 04, 2017, to date: Nov 14, 2017, namely for a period of 41 days (1 Month and 10 Days), with an annual simple flat interest rate of 10% if the commission fee (withdrawal) is 238%. Sep 16 19:08 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: May 18, 0308, to date: Jun 25, 2017, namely for a period of 624,238 days (20,509 Months and 7 Days), with an annual simple flat interest rate of 60% if the commission fee (withdrawal) is 0%. Sep 16 19:07 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: Jun 03, 0184, to date: May 18, 2017, namely for a period of 669,473 days (21,995 Months and 15 Days), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 270%. Sep 16 19:04 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: May 03, 0308, to date: Jun 18, 0976, namely for a period of 244,029 days (8,017 Months and 15 Days), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 0%. Sep 16 19:04 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 392 units (Dollar, Euro, Pound, etc.), from date: Jul 03, 2017, to date: Aug 03, 2017, namely for a period of 31 days, with an annual simple flat interest rate of 3% if the commission fee (withdrawal) is 0%. Sep 16 19:04 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: Mar 22, 2017, to date: Sep 16, 2018, namely for a period of 543 days (18 Months without 6 Days), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 0%. Sep 16 19:04 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: May 18, 0626, to date: Jun 18, 0888, namely for a period of 95,726 days (3,145 Months), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 0%. Sep 16 19:03 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: Jun 06, 0746, to date: Jun 06, 2017, namely for a period of 464,224 days (15,252 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Sep 16 19:03 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: Mar 30, 2018, to date: Oct 13, 2018, namely for a period of 197 days (7 Months without 17 Days), with an annual simple flat interest rate of 7.5% if the commission fee (withdrawal) is 0%. Sep 16 19:00 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 26, 2021, to date: Jan 26, 2022, namely for a period of 365 days (12 Months), with an annual simple flat interest rate of 18% if the commission fee (withdrawal) is 0%. Sep 16 19:00 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: May 04, 2020, to date: May 04, 2021, namely for a period of 365 days (12 Months), with an annual simple flat interest rate of 716% if the commission fee (withdrawal) is 0%. Sep 16 19:00 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.