Simple flat rate interest calculator: calculate the due interest on an amount of money lent, deposited or borrowed by the interest rate, principal (starting amount), duration and additional transactional fees (withdrawal, payment in advance)

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 100 units (Dollar, Euro, Pound, etc.), from date: Apr 25, 0960, to date: Oct 25, 2016, namely for a period of 385,879 days (12,678 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%. Jul 16 03:28 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 50 units (Dollar, Euro, Pound, etc.), from date: Dec 03, 0230, to date: Apr 03, 2017, namely for a period of 652,445 days (21,436 Months), with an annual simple flat interest rate of 1.75% if the commission fee (withdrawal or payment) is 0%. Jul 16 03:28 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 3,600 units (Dollar, Euro, Pound, etc.), from date: Jul 14, 0134, to date: Jul 14, 2017, namely for a period of 687,752 days (22,596 Months), with an annual simple flat interest rate of 1,278.84% if the commission fee (withdrawal or payment) is 0%. Jul 16 03:28 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 203,630,334 units (Dollar, Euro, Pound, etc.), from date: Feb 01, 2000, to date: Feb 02, 2015, namely for a period of 5,480 days (180 Months and 1 Day), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%. Jul 16 03:28 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 4,000 units (Dollar, Euro, Pound, etc.), from date: Feb 21, 2019, to date: Mar 21, 2019, namely for a period of 28 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 2%. Jul 16 03:27 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: Feb 18, 2017, to date: Jun 18, 2017, namely for a period of 120 days (4 Months), with an annual simple flat interest rate of 1.3% if the commission fee (withdrawal or payment) is 734%. Jul 16 03:26 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: May 07, 1980, to date: Apr 07, 2017, namely for a period of 13,484 days (443 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%. Jul 16 03:26 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 40,000 units (Dollar, Euro, Pound, etc.), from date: Dec 13, 2018, to date: Jan 13, 2019, 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%. Jul 16 03:26 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100,000 units (Dollar, Euro, Pound, etc.), from date: Jun 30, 0104, to date: Jun 11, 2014, namely for a period of 697,594 days (22,920 Months without 19 Days), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%. Jul 16 03:26 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 169,000,000 units (Dollar, Euro, Pound, etc.), from date: Mar 14, 2019, to date: Mar 14, 2020, namely for a period of 366 days (12 Months), with an annual simple flat interest rate of 1.5% if the commission fee (withdrawal or payment) is 0%. Jul 16 03:25 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 116,043.62 units (Dollar, Euro, Pound, etc.), from date: Nov 27, 2017, to date: Dec 10, 2017, namely for a period of 13 days, with an annual simple flat interest rate of 4% if the commission fee (withdrawal or payment) is 0%. Jul 16 03:25 UTC (GMT)
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: Jan 01, 2020, to date: Jan 01, 2023, 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%. Jul 16 03:25 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 6,000 units (Dollar, Euro, Pound, etc.), from date: Jan 11, 2019, to date: Feb 11, 2019, namely for a period of 31 days, with an annual simple flat interest rate of 8% if the commission fee (withdrawal or payment) is 0%. Jul 16 03:25 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.