Adjustable Mortgage Calculator

Payment reset calculator

What happens to my payment when my ARM adjusts?

Your note sets a limit on how far the rate can move at each change and over the life of the loan. Enter what the note says and this works out the next payment, the most that payment can become, and how high it could go if the rate rose at every opportunity.

Which describes you?
Your loan today

The unpaid principal balance on your most recent servicer statement. Not your original loan amount.

Your note rate, on your statement or your latest rate-change notice.

Count the payments between now and your maturity date. A loan with 25 years left has 300.

Principal and interest only. Leave out escrow, taxes, insurance, mortgage insurance and HOA dues. If you leave this blank it gets calculated instead, which is slightly less exact.

On your ARM rider or your last adjustment notice. Enter 0 if the change is happening now.

The first change usually has its own, larger limit. Later changes use the ongoing limit.

What the rate is based on

These come from your promissory note or ARM rider, or from the Adjustable Interest Rate table on a Loan Estimate.

Nobody knows what the index will be on your change date. Pick a value you want to see the effect of. Today's value is a reasonable starting point.

A fixed number added to the index. It is written in your note and does not change.

Most notes round the index plus margin to the nearest one-eighth of a percent. Your note states which.

Limits in your note

A limit of 0 means the rate cannot move that way at all. That is not the same as having no limit, so choose No limit rather than typing 0 if your note is silent.

Does your loan do any of this?

This calculator only handles ordinary loans where every payment pays down the balance. Tick anything your note describes and it will tell you rather than guess.

Add taxes, insurance & other housing costs

Every field here is optional. Only the figures you enter are included, and anything left blank counts as zero. Nothing on this site estimates a cost for you: no taxes worked out from a home value, no insurance from a location, no mortgage insurance from a loan-to-value ratio, no HOA dues from a property type.

Pay my loan off faster

Optional. Enter when you would like the loan gone and this shows the principal and interest payment that would get you there, using the balance and rate you entered above.

A number of years shorter than the time you have left. This uses the balance and the rate you entered, and assumes that rate never changes.

Your results will appear here once you fill in the loan.