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 4,950 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jun 01, 2008, to date: Jan 01, 2018, namely for a period of 3,501 days (115 Months), with an annual simple flat interest rate of 7% if the commission fee (withdrawal or payment) is 0%. May 26 05:38 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: May 02, 2017, to date: May 02, 2019, namely for a period of 730 days (24 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%. May 26 05:36 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 28,400 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Mar 20, 2006, to date: Mar 20, 2026, namely for a period of 7,305 days (240 Months), with an annual simple flat interest rate of 9.9% if the commission fee (withdrawal or payment) is 0%. May 26 05:35 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 4,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Oct 26, 2017, to date: Nov 26, 2017, namely for a period of 31 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 0%. May 26 05:34 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: May 22, 2017, to date: Jun 22, 2017, namely for a period of 31 days, with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%. May 26 05:30 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Apr 26, 2018, to date: Apr 26, 2021, namely for a period of 1,096 days (36 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 0%. May 26 05:30 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 935 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Nov 20, 2017, to date: Nov 20, 2018, namely for a period of 365 days (12 Months), with an annual simple flat interest rate of 1.5% if the commission fee (withdrawal or payment) is 0%. May 26 05:28 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: May 27, 2017, to date: Dec 27, 2017, namely for a period of 214 days (7 Months), with an annual simple flat interest rate of 1% if the commission fee (withdrawal or payment) is 0.2%. May 26 05:25 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 14,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jan 18, 2017, to date: Feb 18, 2017, namely for a period of 31 days, with an annual simple flat interest rate of 4% if the commission fee (withdrawal or payment) is 0%. May 26 05:24 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 150,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jan 26, 2017, to date: Apr 26, 2017, namely for a period of 90 days (3 Months), with an annual simple flat interest rate of 9% if the commission fee (withdrawal or payment) is 0%. May 26 05:23 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 50,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jun 03, 2017, to date: Jun 03, 2022, namely for a period of 1,826 days (60 Months), with an annual simple flat interest rate of 11.95% if the commission fee (withdrawal or payment) is 2%. May 26 05:23 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: May 23, 2017, to date: Aug 23, 2017, namely for a period of 92 days (3 Months), with an annual simple flat interest rate of 12% if the commission fee (withdrawal or payment) is 0%. May 26 05:21 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 7,505 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Mar 17, 2017, to date: Dec 06, 2017, namely for a period of 264 days (9 Months without 11 Days), with an annual simple flat interest rate of 975% if the commission fee (withdrawal or payment) is 0%. May 26 05:21 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.