Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 9,000 units (Dollar, Euro, Pound, etc.), from date: Jul 18, 1980, to date: Jul 18, 2017, namely for a period of 13,514 days (444 Months), with an annual simple flat interest rate of 9.2% if the commission fee (withdrawal) is 0%.

Principal (initial amount), P = 9,000


Annual simple interest rate, R = 9.2%


From date: Jul 18, 1980


To date: Jul 18, 2017


Duration, T = 13,514 days (444 Months)


Commission fee (withdrawal), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(9,000 × 9.2% × 13,514) ÷ 365 =


(9,000 × 9.2 × 13,514) ÷ (365 × 100) =


1,118,959,200 ÷ 36,500 ≈


30,656.416438356164 ≈


30,656.42

B = Amount earned:

B = P + I =


9,000 + 30,656.416438356164 =


39,656.416438356164 ≈


39,656.42

Signs: % percent, ÷ divide, × multiply, = equal, ≈ approximately equal;

Writing numbers: comma ',' as thousands separator; point '.' as a decimal mark;

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 9,000 units (Dollar, Euro, Pound, etc.), from date: Jul 18, 1980, to date: Jul 18, 2017, namely for a period of 13,514 days (444 Months), with an annual simple flat interest rate of 9.2% if the commission fee (withdrawal) is 0%. Jun 20 00:58 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 30,000 units (Dollar, Euro, Pound, etc.), from date: Dec 18, 2019, to date: Jan 17, 2025, namely for a period of 1,857 days (61 Months without 1 Days), with an annual simple flat interest rate of 8% if the commission fee (withdrawal) is 0%. Jun 20 00:58 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,270,550 units (Dollar, Euro, Pound, etc.), from date: Aug 01, 0962, to date: Dec 30, 2016, namely for a period of 385,117 days (12,652 Months and 29 Days), with an annual simple flat interest rate of 14.53% if the commission fee (withdrawal) is 0%. Jun 20 00:58 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,270,550 units (Dollar, Euro, Pound, etc.), from date: Aug 01, 0962, to date: Dec 30, 2016, namely for a period of 385,117 days (12,652 Months and 29 Days), with an annual simple flat interest rate of 14.53% if the commission fee (withdrawal) is 0%. Jun 20 00:58 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 70,000 units (Dollar, Euro, Pound, etc.), from date: Jan 26, 2017, to date: Aug 26, 2017, namely for a period of 212 days (7 Months), with an annual simple flat interest rate of 8% if the commission fee (withdrawal) is 376%. Jun 20 00:57 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: Oct 16, 0936, to date: Sep 16, 2017, namely for a period of 394,797 days (12,971 Months), with an annual simple flat interest rate of 15% if the commission fee (withdrawal) is 710%. Jun 20 00:57 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: Feb 01, 2058, to date: Jan 01, 9999, namely for a period of 2,900,359 days (95,291 Months), with an annual simple flat interest rate of 15% if the commission fee (withdrawal) is 52%. Jun 20 00:57 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: Oct 16, 0936, to date: Sep 16, 2017, namely for a period of 394,797 days (12,971 Months), with an annual simple flat interest rate of 15% if the commission fee (withdrawal) is 710%. Jun 20 00:57 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 12, 0924, namely for a period of 225,015 days (7,393 Months without 6 Days), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 0%. Jun 20 00:57 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 12, 0924, namely for a period of 225,015 days (7,393 Months without 6 Days), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 0%. Jun 20 00:57 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: Jan 01, 2019, to date: Dec 01, 2385, namely for a period of 134,013 days (4,403 Months), with an annual simple flat interest rate of 1% if the commission fee (withdrawal) is 0%. Jun 20 00:57 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 24, 2017, to date: Aug 30, 2017, namely for a period of 187 days (6 Months and 6 Days), with an annual simple flat interest rate of 3.8% if the commission fee (withdrawal) is 190%. Jun 20 00:57 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: Nov 24, 2018, to date: Dec 24, 2018, namely for a period of 30 days, with an annual simple flat interest rate of 5% if the commission fee (withdrawal) is 0%. Jun 20 00:57 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.