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How Do You Calculate a Mortgage Payment Without a Mortgage Calculator?

By
Mortgage and Lending with imortgage

Arizona Mortgage PaymentsCalculating an exact mortgage payment without a calculator on a loan is no small task, but there are some simple rules-of-thumb you can use to get a close estimate.

With the exception of the MIT Blackjack Team, performing this type of complex math in your head often leads to frustrating rants.

When coming up with a rough estimate, it is important to understand the individual components that factor into the overall monthly mortgage payment.

Yes, the thousands of dollars you send to your lender every year may cover more than just the mortgage, but referring to one simple formula will help you gauge what the new payment will be as you're out looking for new properties that may be in your price range.

What's In A Mortgage Payment?

A mortgage consists of 4-6 parts:

  • Principal - the balance of the loan
  • Interest - the fee paid to borrow the mortgage money
  • Property Taxes - based on county assessed value and residence type
  • Hazard Insurance - in the case of fire or property damage (may include a separate flood policy)
  • Mortgage Insurance - more than 80% LTV on conventional loans, or with FHA financing

Most lenders use the acronym (PITI), which includes Principal, Interest, Taxes and Insurance.

And in the case where a separate Mortgage Insurance Premium is required, we add another "I" to the end of that creative series of letters.

Another monthly expense that you have to consider is the monthly dues that come with properties that have a homeowner's association (common in condominiums and other developments). This isn't a payment made to your lender, but you will have to qualify with that payment and it is also best practice for you to factor that in the monthly cost of your new home.

Confused yet? Don't worry, this is slightly easier than most state bar exams.

The Mortgage Payment Cheat Sheet:

Ok, you've made it this far and haven't closed your browser, so that is a good thing.

Please keep in mind, this top secret formula will by no means be exact.

Mortgage Payment Formula (based on a basic 30 year fixed rate mortgage):

For every $1000 you borrower, your TOTAL monthly mortgage payment will be $8.

So, if you purchase a home for $250,000 with a $50,000 down payment - borrowing a total of $200,000, then a good estimated total monthly PITI payment would be roughly $1600.

But don't forget to add your homeowners association dues to that monthly payment.

What If I Pay Taxes and Insurance Separately?

Well now we're at the easy part. If you elect to pay taxes separate from your mortgage, the cheat sheet is reduced from $8 per $1000 down to $6 per $1000.

So there you have it. $8 for every $1000 borrowed.

Again, please keep in mind that this is not going to give you an EXACT payment. You may be purchasing a property with higher real estate taxes or your insurance premiums may be higher than average depending on the state you live in.

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Related Articles - Mortgage Payments:

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Jeffrey DiMuria 321.223.6253 Waves Realty
Waves Realty - Melbourne, FL
Florida Space Coast Homes

that is really nice info and I bet a lot of agents are going to be bookmarking this post for future use.

Feb 15, 2011 04:41 PM
Tommy Taylor
Taylor Properties & TexasForSale.net - Kerrville, TX
CNE- Texas Hill Country Realtor

Thanks for the quick tip. Always nice to get a refresher on these things.

Feb 15, 2011 04:43 PM
Patricia Feager, MBA, CRS, GRI,MRP
DFW FINE PROPERTIES - Flower Mound, TX
Selling Homes Changing Lives

Thanks for the clear and easy steps to figure it out. I always refer my clients to a lender but it sure helps to understand!

Feb 15, 2011 04:50 PM
Maya Swamy
Funds Available - Long Beach, CA
Ph.D. Long Beach, CA - fundsavailable.com

Doesn't the $8 depend on property tax rates? Here in California our property taxes are 1.25% of purchase price.e It is then a little more accurate to say an interest rate per thousand.

Feb 15, 2011 04:53 PM
Tim Bradley
Contour Investment Properties - Jackson Hole, WY
Commercial Real Estate Expert in Jackson Hole, WY

More importantly, the payment relies on the amortization term and the interest rate. A 15 year note is going to have a MUCH higher payment than a 30 year note.

Feb 15, 2011 04:58 PM
Brian West
imortgage - Gilbert, AZ
Arizona Lender

Jeffrey, glad you find it useful

Tommy - you are welcome!

Patricia - Any time! But I would still always refer them to the lender as it creates an extra layer of bonds with the client and also assures the client receives accurate info for your area and their circumstances, loan type, loan term, etc.. The example is pretty much based on typical 30 year fixed rate mortgages

Maya - you are absolutely correct! If you look at the very last statement in the post above "Related Articles", you will see that discussed. Great point though! The estimate formula actually works extremely well here in AZ where I am licensed

Feb 15, 2011 04:58 PM
Brian West
imortgage - Gilbert, AZ
Arizona Lender

Tim - very true, just as I responded to Patricia and I added that to my post as an additional caviat. Thanks for the comment

Feb 15, 2011 04:59 PM
Jon Quist
REALTY EXECUTIVES ARIZONA TERRITORY - Tucson, AZ
Tucson's BUYERS ONLY Realtor since 1996

Good cheat sheet tips, but with lower interest rates now in effect is the figure really still $8.00 per thousand?

Feb 15, 2011 05:26 PM
Fred Cope
Reliant Realty in Nashville, TN - Nashville, TN
Looking For Homes With A Smile

Brian,  25 years ago, this same question existed; and for nostalgic purposes, here were the most popular answers:

1. Call Daddy's banker and ask him.

2. Look in the Yellow Pages: find some mortgage company, dial the number and ask "What would the monthly payment be on $200,000.  Of course the excited L.O. hoping to get the loan grab his chart and desktop calculator, and enthusiastically punched the keys.  After answering the question and asking for the business, the LO heard the caller say, "Thank you, but i already have a loan officer, but this is his day to play golf."

3. Call your neighbor who sells real estate, and ask her.  When she solicited the business, she heard, "Thank you, but my friend's mom is helping me buy a home; but she is at a Mary Kay meeting."

4.  The inquirer flipped the local loan officer's business card over, found the factor and did the arithmetic--you know, the one the neighbor agent gave them.

 

We loan officers, marketed factor charts as laminated cards,  calendar inserts, post-it note pads, and of course we entered those factors on our rate sheets.  We would distibute at least 500 rate sheets across 20 to 25 realty offices each day.  Like a blind hog, we would root out any loan application we could find in any of those offices.  By the way, back then loan originators were welcome guest in any real estate office, and especally with donuts.  A calculator sat on a desk top, and was plugged into a wall outlet.  Rolls of paper were kept nearby.

How things change and yet remain the same.

 

Feb 15, 2011 05:30 PM
Brian West
imortgage - Gilbert, AZ
Arizona Lender

Hi Jon - with interest rates where they are and have been, the factor is about $6 per $1,000. The $8 take taxes and insurance in to account, but as mentioned this is only a way of ballparking a payment. Obviously many things can affect the actual payment. I also figure if the estimated payment using $8 is higher than actual, it's better than estimating a lower one. Thanks for stopping in

Fred - thank you for the journey down memory lane (even though some of which went too far back for me :) I too have received calls like that, for me however are the ones that just want a free credit report. By the way, what the heck are Yellow Pages? haha

Feb 16, 2011 01:31 AM
Fred Cope
Reliant Realty in Nashville, TN - Nashville, TN
Looking For Homes With A Smile
Brian, Yellow pages was after yell'n down the holl'r, and before that cowboy started sell'n yella wood. I guess that is what they do with all the trees that used to be cut down to make yellow page books.
Feb 17, 2011 04:26 AM