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DREAM HOME,
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DREAM HOME,
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Simple and Easy Mortgage Loans
Simple and Easy Mortgage Loans

Mortgage Calculations by Hand

First you must define some variables to make it easier to set up: P = principal, the initial amount of the loan I = the annual interest rate (from 1 to 100%) L = length, the length (in years) of the loan, or at least the length over which the loan is amortized.

The following assumes a typical conventional loan where the interest is compounded monthly. First we'll define two more variables to make the calculations easier: J = monthly interest in decimal form = I / (12 x 100) N = number of months over which loan is amortized = L x 12

Now for the big monthly payment (M) formula ... it is:

J M = P x ------------------------ 1 - ( 1 + J ) ^ -N where 1 is the number one (it does not appear too clearly on some browsers)

So to calculate it, you would first calculate 1 + J then take that to the -N (minus N) power, subtract that from the number 1. Now take the inverse of that (if you have a 1/X button on your calculator push that). Then multiply the result times J and then times P.

The one-liner for a program would be (adjust for your favorite language):

M = P * ( J / (1 - (1 + J) ** -N))

So now you should be able to calculate the monthly payment, M. To calculate the amortization table you need to do some iterations (i.e. a simple loop). Here are the simple steps :

Step 1: Calculate H = P x J, this is your current monthly interest
Step 2: Calculate C = M - H, this is your monthly payment minus your monthly interest, so it is the amount of principal you pay for that month
Step 3: Calculate Q = P - C, this is the new balance of your principal of your loan.
Step 4: Set P equal to Q and go back to Step 1: You thusly loop around until the value Q (and hence P) goes to zero.

Many people have asked how to find N (number of payments) given the payment, interest and loan amount. The answer to the actual formula is in the book: The Vest Pocket Real Estate Advisor by Martin Miles (Prentice Hall). Here's the formula:

N = -1/Q * (LN(1-(B/M)*(R/Q)))/LN(1+(R/Q))

Where:

  • Q = amount of annual payment periods
  • R = interest rate
  • B = principle
  • M = payment amount
  • N = amount payment period
  • LN = natural logarithm

 1st Rate Home Mortgage, Inc. 
All Rights Reserved

 1st Rate Home Mortgage, Inc. 
All Rights Reserved

888.844.7077
NMLS ID: 37411 | http://www.nmlsconsumeraccess.org/ | Texas Consumer Complaint and Recovery Notice

Alaska, Arizona, California, Colorado, Florida, Hawaii, Idaho, Illinois, Maryland, Michigan, New Mexico, Oregon, Texas, Utah,
Virginia, and Washington
AK37411, AZ0940290, CA BRE-01863044, CA DBO-603G892, FL MLD1188, HI-37411, ID MBL-7153, IL MB.6761146,
MD 21315, MI FL0018183, NM 03711, OR ML-4837, UT 9896852, VA MC-5623, and WA CL37411
 



 

 

 

888.844.7077
NMLS ID: 37411 | http://www.nmlsconsumeraccess.org/ | Texas Consumer Complaint and Recovery Notice

Alaska, Arizona, California, Colorado, Florida, Hawaii, Idaho, Illinois, Maryland, Michigan, New Mexico, Oregon, Texas, Utah,
Virginia, and Washington
AK37411, AZ0940290, CA BRE-01863044, CA DBO-603G892, FL MLD1188, HI-37411, ID MBL-7153, IL MB.6761146,
MD 21315, MI FL0018183, NM 03711, OR ML-4837, UT 9896852, VA MC-5623, and WA CL37411