No, I don't.  I have mortgage professionals handle that part of a transaction.  

YES, I use Jason E. Gordon's APP, it's called his phone number: as a Realtor, I do not quote rates, amortization nor fees, I send them to the Mortgage Master. (Actually though, Jason really does offer an APP with a calculator on it that's customized to his business).

There was a time when this was a must know...That time has passed

No I do not

I do not.

No as there are so many now I find it unncessary. I threw out my calculator a few years ago also (fancy HP thing).

No I don't but I am going to check to see if Bankrate has one-good idea!

Yes, it's a (704) area code - they'll reach one of my mortgage professionals! 

I have an app from  title company..I list more than work with buyers...I have them work with mortgage professionals.

Looks like Kenneth J. Jones has this once covered for you.  I do not. I leverage my lender. 

I have buyers get that information from my lender.

No, I leave that information to the lenders

Yup: RE CALC  its free

I just use the one that came with the phone, for anything more complex I have Excel.

I don't... I do not do these calculations... my mortgage lenders do them with my clients.

I do not

No I do not but the lenders we partner with do plus all of our buyers are pre-qualified by them far in advance of actually going out to look at homes.

No.

I just got a title app that has that on it.  It's only an estimate though and I tell people best to talk with a lender.

I have app on my phone from a title company. My lender also provides one a long time ago.

I leave the mortgage calculations to lenders but in a pinch I use an HP 12C.  

I use Karl's Mortgage Calculator. It's free!

Michael J. Perry Yes, powerOne financial calculator app.

I have different ones. Capitol Abstract has a mortgage calculator and I use an online one from Pat Zaby.

I have one on my website. I use it all the time!

I do have one. It shows the schedule of payments, too. It's called...Simple Loan Calculator. 

No.

Michael J. Perry - I use KW's app - and rarely used it.

 Part of what Kenneth J. Jones said.  They will get my HP-12C when they pry it from my cold dead fingers.

I have one on ly web site that is easy to get to

I have my own application with a mortgage calculator in it. 

Yes. I use the mortgage loan calculator. It comes in handy when clients want to know what their PITI ranges at according to different scenario of downpayments.

it's been along time since I needed that.... but I did find a little green mortgage payment book!!!  another "oldie"...

I do not. I have been doing this so long I can calculate a ballpark figure in my head and leave the exacts to the lender.

We have on on our website but I can remember the times I have calculated a mortgage for someone on half of one of my hands.  I refer them to their lender for this and we make sure to have all the numbers spelled out before an offer is made.  -Kasey

I use the one on my website or if more details are required, I have them contact the mortgage lenders that are available to give quotes.

Michael,

We would suggest what Kenneth J. Jones mentioned.

No, I can do this from web sites, I find that easier.

Try Office Calculator Free app for your smartphone. But I also use a Surface tablet on the road, and Microsoft Win 10 has a fantastic one from MSN Money I use in client discussions because of the larger flip screen and the fancy chart (people like images better than numbers).

And... you can just ask Cortana. She'll mortgage calculate for you.

I designed an Excel spreadsheet when I do more advanced calculations at the office to take into account insurance, taxes, HOA...etc...

On my smartphone, I have an advanced app as well - which I seldom use (because I prefer the more complex calculations to do at my desk) called US Mortgage Calculator. 

Of course, I have an HP Financial Calculator on my desk gathering dust. It's soooooooo old school, really don't need it anymore, and I don't have to carry it anymore thanks to my smartphone.