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 1 units (Dollar, Euro, Pound, etc.), from date: Jan 01, 0176, to date: Jan 01, 0678, namely for a period of 183,352 days (6,024 Months), with an annual simple flat interest rate of 15% if the commission fee (withdrawal) is 0%. Sep 16 18:47 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 05, 0954, to date: Sep 05, 2016, namely for a period of 387,858 days (12,743 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal) is 660%. Sep 16 18:46 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, 0490, to date: Jan 01, 2018, namely for a period of 558,090 days (18,336 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal) is 178%. Sep 16 18:44 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 10 units (Dollar, Euro, Pound, etc.), from date: Jun 19, 0472, to date: May 19, 0996, namely for a period of 191,356 days (6,287 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 0%. Sep 16 18:43 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,000 units (Dollar, Euro, Pound, etc.), from date: Jan 23, 2017, to date: Jul 23, 2017, namely for a period of 181 days (6 Months), with an annual simple flat interest rate of 0% if the commission fee (withdrawal) is 422%. Sep 16 18:43 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: Nov 28, 2018, to date: Dec 28, 2018, namely for a period of 30 days, with an annual simple flat interest rate of 0.2% if the commission fee (withdrawal) is 862%. Sep 16 18:41 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,290 units (Dollar, Euro, Pound, etc.), from date: Mar 20, 2008, to date: Jul 20, 2018, namely for a period of 3,774 days (124 Months), with an annual simple flat interest rate of 7.3% if the commission fee (withdrawal) is 0%. Sep 16 18:41 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 18,500 units (Dollar, Euro, Pound, etc.), from date: Jul 10, 2017, to date: Aug 10, 2017, namely for a period of 31 days, with an annual simple flat interest rate of 0.45% if the commission fee (withdrawal) is 0%. Sep 16 18:41 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: May 18, 0552, to date: Jun 18, 0936, namely for a period of 140,284 days (4,609 Months), with an annual simple flat interest rate of 572% if the commission fee (withdrawal) is 0%. Sep 16 18:40 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 25, 0108, to date: Nov 01, 0204, namely for a period of 35,070 days (1,153 Months without 24 Days), with an annual simple flat interest rate of 10% if the commission fee (withdrawal) is 0%. Sep 16 18:40 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 02, 0730, to date: May 02, 2017, namely for a period of 470,037 days (15,443 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal) is 466%. Sep 16 18:40 UTC (GMT)
Calculate due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,000 units (Dollar, Euro, Pound, etc.), from date: Jun 15, 2017, to date: Jun 15, 2020, namely for a period of 1,096 days (36 Months), with an annual simple flat interest rate of 364% if the commission fee (withdrawal) is 0%. Sep 16 18:40 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, 0552, to date: Jun 18, 0936, namely for a period of 140,284 days (4,609 Months), with an annual simple flat interest rate of 572% if the commission fee (withdrawal) is 0%. Sep 16 18:40 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.