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Adjustable Rate Mortgage Payment Calculator to Calculate ARM Payments and Interest

Calculator Preferences
Adjustable Rate Mortgage Payment Calculator Sign
Adjustable Rate Mortgage Payment Calculator

This calculator will calculate the initial payment, maximum payment, and adjusted payments for an ARM loan. Includes a printer friendly summary, adjustment chart, and amortization schedule. The Learn tab includes:

  • ARM definition and basics.
  • Types of ARMs.
  • ARM warnings.
Learn More

Selected Data Record:

A Data Record is a set of calculator entries that are stored in your web browser's Local Storage. If a Data Record is currently selected in the "Data" tab, this line will list the name you gave to that data record. If no data record is selected, or you have no entries stored for this calculator, the line will display "None".

DataData recordData recordSelected data record: None
ARM amount:ARM loan amount:Adjustable rate mortgage amount:Adjustable rate home mortgage amount:

Adjustable rate home mortgage amount:

Enter the dollar amount of the home loan (principal amount), but without the dollar sign and any commas.

Start rate:Starting rate:Starting annual interest rate:Starting annual interest rate:

Starting annual interest rate:

Enter the starting annual percentage rate (APR) of the home loan. Enter as a percentage without the percent sign (for 6%, enter 6).

# of years:Number of years:Loan term in years:Home loan term in number of years:

Loan term in number of years:

Select the term of the home loan in number of years.

Months before 1st rate adjust:# of months before 1st rate adjustment:# of months before 1st rate adjustment:Number of months before 1st rate adjustment:

Number of months before 1st rate adjustment:

Enter the number of months before the first rate adjustment will be made (usually 36, 60, 72, 84, 120, or 180).

Months between adjustments:# of months between adjustments:Number of months between adjustments:Number of months between adjustments:

Number of months between adjustments:

Enter the number of months between rate adjustments once the initial rate adjustment has been made (usually 12 months, but can be as many as 180 months).

Expected adj:Expected adjustment:Expected adjustment:Expected adjustment:

Expected adjustment:

Enter the percentage amount you expect the rate to increase or decrease by for each adjustment period. Enter a minus (-) sign before the percentage if you expect rates to fall during the course of the payoff. Enter as a percentage but without the percent sign (for .0025, which is 1/4 point, enter .25).

Rate cap:Interest rate cap:Interest rate cap:Interest rate cap:

Interest rate cap:

Enter the maximum allowable interest rate on the ARM. Once the maximum is reached, the Adjustable Rate Mortgage Payment Calculator will fix the rate for the remainder of the repayment term. Enter as a percentage without the percent sign (for 6%, enter 6).

Initial pmt:Initial payment:Initial monthly payment:Initial monthly principal and interest payment:

Initial monthly principal and interest payment:

Based on your entries, this how much your starting monthly house payment will be. This does not include property tax or insurance payments.

Total pmts:Total all pmts:Total of all monthly house payments:Total of all monthly house payments:

Total of all monthly house payments:

Based on your entries, this is the total of all of your monthly house payments (principal plus interest).

Interest cost:Interest cost:Interest cost:Interest cost:

Interest cost:

Based on your entries, this is how much interest you will pay between now and when you finish the home loan repayment.

Max payment:Maximum payment:Maximum monthly payment:Maximum monthly payment:

Maximum monthly payment:

Based on the entered rate cap, this is the maximum monthly payment for the ARM.

If you would like to save the current entries to the secure database, tap or click on the Data tab, select "New Data Record", give the data record a name, then tap or click the Save button. To save changes to previously saved entries, simply tap the Save button. Please select and "Clear" any data records you no longer need.

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Help and Tools

Help and Tools:

This section, which you can Unstick or Hide in the Calculator Preferences (just above the top of the calculator), contains the following tabs (content too long to fit within bordered frame can be scrolled up and down):

About: Click this tab for an introduction to the calculator.

Instructions: Click this tab for step-by-step instructions for using the calculator.

Terms: Click this tab for a list of the descriptions that are located within each popup help button (info icons).

PCalc: Click this tab for a handy "pocket" calculator you can use when you need to calculate an entry needed for the calculator.

Data: Click this tab to save a set of entries or a note in between visits. Entries and notes will be stored to your web browser's local storage (if supported by your browser of choice), meaning they can only be recalled with the same device and web browser you were using when you saved them. If you'd like to save entries and notes between devices you can do so by subscribing to the Ad-Free Member Version.



Add or remove this page to/from my favorites.

Adjust Calculator Width:

Move the slider to left and right to adjust the calculator width. Note that the Help and Tools panel will be hidden when the calculator is too wide to fit both on the screen. Moving the slider to the left will bring the instructions and tools panel back into view.

Also note that some calculators will reformat to accommodate the screen size as you make the calculator wider or narrower. If the calculator is narrow, columns of entry rows will be converted to a vertical entry form, whereas a wider calculator will display columns of entry rows, and the entry fields will be smaller in size ... since they will not need to be "thumb friendly".

Show/Hide Popup Keypads:

Select Show or Hide to show or hide the popup keypad icons located next to numeric entry fields. These are generally only needed for mobile devices that don't have decimal points in their numeric keypads. So if you are on a desktop, you may find the calculator to be more user-friendly and less cluttered without them.

Stick/Unstick Tools:

Select Stick or Unstick to stick or unstick the help and tools panel. Selecting "Stick" will keep the panel in view while scrolling the calculator vertically. If you find that annoying, select "Unstick" to keep the panel in a stationary position.

If the tools panel becomes "Unstuck" on its own, try clicking "Unstick" and then "Stick" to re-stick the panel.