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2. Amortization calculator - Wikipedia

   en.wikipedia.org/wiki/Amortization_calculator

   Converting an annual interest rate (that is to say, annual percentage yield or APY) to the monthly rate is not as simple as dividing by 12; see the formula and discussion in APR. However, if the rate is stated in terms of "APR" and not "annual interest rate", then dividing by 12 is an appropriate means of determining the monthly interest rate.

3. Mortgage calculator - Wikipedia

   en.wikipedia.org/wiki/Mortgage_calculator

   Mortgage calculators can be used to answer such questions as: If one borrows $250,000 at a 7% annual interest rate and pays the loan back over thirty years, with $3,000 annual property tax payment, $1,500 annual property insurance cost and 0.5% annual private mortgage insurance payment, what will the monthly payment be? The answer is $2,142.42.

4. Amortizing loan - Wikipedia

   en.wikipedia.org/wiki/Amortizing_loan

   where: P is the principal amount borrowed, A is the periodic amortization payment, r is the periodic interest rate divided by 100 (nominal annual interest rate also divided by 12 in case of monthly installments), and n is the total number of payments (for a 30-year loan with monthly payments n = 30 × 12 = 360).

5. Weighted-average life - Wikipedia

   en.wikipedia.org/wiki/Weighted-Average_Life

   where r is the annual interest rate and P is the initial principal. This can be understood intuitively as: "The average dollar of principal is outstanding for the WAL, hence the interest on the average dollar is WAL × r {\displaystyle {\text{WAL}}\times r} , and now one multiplies by the principal to get total interest payments."

6. Fisher equation - Wikipedia

   en.wikipedia.org/wiki/Fisher_equation

   The Fisher equation plays a key role in the Fisher hypothesis, which asserts that the real interest rate is unaffected by monetary policy and hence unaffected by the expected inflation rate. With a fixed real interest rate, a given percent change in the expected inflation rate will, according to the equation, necessarily be met with an equal ...

7. Effective interest rate - Wikipedia

   en.wikipedia.org/wiki/Effective_interest_rate

   The effective interest rate is calculated as if compounded annually. The effective rate is calculated in the following way, where r is the effective annual rate, i the nominal rate, and n the number of compounding periods per year (for example, 12 for monthly compounding): [1]