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Annual Percentage Rate (APR) Calculator
Loan Amount: 
Loan Fees: 
Interest Rate (%): 
Pay Term (Month): 
Closing Fees: 
     
Monthly Payment: 
Total Payment: 
Total Interest Payed: 
Direct-ratio APR (%): 
Constant-ratio APR (%): 
N-ratio APR (%): 



Annual Percentage Rate (APR) is the equivalent interest rate of a loan including all loan fees and interests payed. The monthly payment is calculated using following formula:
  
Where:
P: Monthly payment
C: Initial loan amount
E: All loan fees
r: Interest rate (%)
N: Pay terms

The total amount payed (T) is:
   T = P * N + F

The total interest payed (I) is:
   I = P * N - C - E

The direct-ratio APR formula is:
   a = 6M * B/(3C(N+1) + B(N+1))

The constant-ratio formula is:
   a = 2M * B /(C(N+1))

The N-ratio formula is:
   a = M(95N + 9) * B/(12N(N+1)(4C + B))

Where:
a: APR
M: Number of payments per year
B: Total finance charges
F: Closing Fees

APR calculation Example:
A $300,000 loan with $4,000 other fees and an annual interest rate 5%, the payback term is 10 years.
The monthly payment = (300000 + 4000) * 0.05 * (1 + 0.05)120 / ((1 + 0.05)120 - 1) = 3224.39
The total payment = 3224.39 * 120 = 386927
The total interest = 386927 - 300000 = 86927
The Direct-ratio APR is 5.241%.
The Constant-ratio APR is 5.747%.
The N-ratio APR is 5.307%.

Note: The most frequently used method by the lender is the actuarial method, while the formula for which is complicated due to the loan structure.