Keeping a Personal Mortgage Calculator

by Diana Hellman 05/19/2019

If the nerd in you comes out as soon as someone starts talking numbers, you might find yourself wondering how hard it is to create a mortgage calculator. Technically called an amortization calculator, the numbers you put into the calculation tell you what your payment each month breaks down to in terms of what goes to the principal (the amount to pay down your loan) and interest (the money the lender makes for loaning you the money).

Getting set up

You can download a spreadsheet to fill in for Excel or Numbers. If you don’t use Excel or Numbers, you can create one in Google sheets (a free online spreadsheet program with a Google account). You will also need a few numbers to set up your amortization schedule.

  • The loan amount. This is the amount you intend to borrow. So, in general, it will be the amount of the sales price of the home minus the down payment. It might include some of the closing costs or points, or other amounts so bear that in mind and adjust your calculator once you get the final numbers at closing.
  • The annual interest rate. For a fixed-interest mortgage, this amount will remain the same throughout the life of the loan. For a variable interest or adjustable loan, each time the rate changes, you should set up a new table going forward.
  • The loan period. Usually, you calculate this in years, so even if your loan is for a partial year, express it in decimals. So, fifteen years and six months would be 15.5.
  • The number of payments per year. Usually, this number is 12 since you make payments every month. In rare cases or for particular types of loans, it could be 4 for quarterly payments or even one if you only pay one time each year.
  • You also need the start date of the loan. Typically, loan calculators assume that the first payment is due at the beginning of the next month after the start date.
  • Optional extra payments. Some calculators also have a formula for voluntary additional payments. For example, if you want to pay off your mortgage to coincide with your retirement, you could try various additional payments until the loan zeros out on that date. That way, you would know exactly how much extra to pay each month to achieve your goals.

These calculators do not account for taxes and insurance since those numbers are subject to change even though you pay them with your monthly payment. If you have questions about how to use a mortgage calculator or how to figure out what your payments might be, speak with your lender for a detailed explanation.

About the Author
Author

Diana Hellman

 Diana Hellman's passion for Larchmont inspires her more than 20 year real estate practice. As a certified buyer's representative, "The development of a solid and trusting relationship with my buyers and sellers is what I strive for." This success, primarily built on client referrals and repeat business, comes from her knowledge of what makes Larchmont unique: it's school system, recreational facilities, services and the special qualities that pervade this village's atmosphere. A former educator with a background in psychology, Diana knows that people don't want a sales pitch, but rather reliable, timely information. She and her husband have been residents of Larchmont for over 40 years. Her 3 children have attended the Mamaroneck Public Schools. She can give you expert advice with the sale or purchase of your home. Awards/Distinctions Multi-million dollar club- Westchester Board of Realtors International Diamond Society (8 million plus in sales), 5-Star agent in 2024. Gold Award- WBR (5-8 million dollars in sales) Silver Award – WBR (3-5 million dollars in sales) Memberships National Association of Realtors New York State Association of Realtors Westchester Board of Realtors Westchester Multiple Listing Service Community Former executive board member of the Central School Former selection school delegate for election of school board candidates Former executive board member of the Friends of the Emelin Theatre Former executive board member of the League of Women Voters