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Karl's Mortgage Calculator Pro

August 05, 2025

More About Karl's Mortgage Calculator Pro

This is the Pro version of Karl's Mortgage Calculator. The only change from the free version is that the adverts have been removed.
Calculate mortgage payments given principal, interest and term. Reverse calculate any one variable given the other three.

Enter a down payment amount or percentage and let the calculator show how large a mortgage you require.

See how the monthly payment changes when you factor in additional monthly or annual loan costs such as PMI, HOA, taxes and insurance.

The calculator supports Fixed and Adjustable Rate Mortgages (ARM) loans with up to five changes in interest rates. Interest-only mortgages loans are also supported.

You can pay off your mortgage early with extra payments. Add one-off, monthly and annual extra payments. Choose up to six additional extra payment amounts and payment periods and the calculator will show how much money you can save on the loan.

Choose from weekly to annual loan payments and adjust the compounding period from daily through annual periods. The calculator supports Canadian mortgages along with UK annual rest mortgages.

Multiple rounding options on loan calculations are also available. Choose between no rounding, round half up, half down, to even, to ceiling and to floor.

The calculator also supports the input and display of multiple currencies.

Latest Version

Update
August 05, 2025
Developer
Dr Karl Jeacle
Apps
Finance
Platforms
Android
Downloads
10,889
License
$1.99
Package Name
com.drcalculator.android.mortgagepro
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User Reviews

KG #Google

4 years ago

Well done to the developer, used the free version for many years and now returning my loyalty I have bought the paid version. Amazing app, keep up with the good work and thank you.

Armando Cendejas

5 years ago

Excellent and easy to use. Data, tables and charts are intuitive. I highly recommend this app for anyone currently-in or beginning a mortgage.

A Google user

5 years ago

Used this calculator for years and love it. We've bought and refinanced many houses and condos. This app was a great help. I bought the pro version to support the developer.

A Google user

6 years ago

Been using this Mortgage Calc for years! It is still the best, the most accurate, and the most user friendly mortgage Calc in the playstore. Directly upgrade to PRO within hours using the free version. Thanks a lot Karl!

Ryan Gt2liff

4 years ago

I am a loan officer and I use this all the time on the go, it's straight forward useful and works great. I used the free version for a while and loved it and decided to upgrade to support Karl and his solid work, I highly recommend!

Vikki Breadner

4 years ago

Been using the free version for a while. Upgraded to pro to support the Dev. It's the only app I've found that allows extra payments, shows Int. saved over mort term & projected length of time to pay off. It closely aligns with my actual mort bal in my banking app. No slider bars (a huge Yay!) Manual inputs only. Many useful features. I've tried many others only to discard them immediately. None even come close to matching the features and functionality of this one. Best Mort/Loan app yet 👌

A Google user

6 years ago

I have used the free version of this calculator for many years. It is great. I noticed today that i never paid for the full version, so i did. it's so worth it if you need a very realistic estimate for your buyers. Great app!

Richard Ward

5 months ago

Just going through mortgage process and this app is acurrate to the penny. But seems strange if on a 5 year fixed I pay extra 5000.00 in month 60 then it's a smaller overall saving and mortgage still 18 years. But same amount at month 61 then much larger saving and knocks off almost 2 years?

A Google user

5 years ago

Great app. Lets me save multiple be loans, so I can easily compare them without having to re-enter my data. I have been using this app for 2 years. I like it so much, I bought the Pro version. Thamks Karl!

Patrick Dunn

4 years ago

Just bought the Pro version to support the developer as the free version is so damn useful. One simple request - please add a month number since mortgage start to the Payment and Period tables. Especially as the number is tied to all the payment options.

Eric Tchao

1 year ago

I never write reviews but made an exception here and purchased the pro version to support the developer. This is an incredibly powerful mortgage calculator and does exactly what you need without any of the nonsense. I'm not in love with the UI but that can be overlooked by how useful it is.

Matt O

3 years ago

Awesome app. All the mortgage calculators I've found out there have not been able to show me what I need to know. This is awesome, hence why I paid for the premium to show my thanks to the developer. Extra payments especially and it's an app which is very convenient.

Anthony C

1 year ago

[Ok on the PMI...] It's a pretty good Mortgage app and has a reasonable purchase price and has good email support. But, it could use a MISC Fee's field, especially when points are used, and when fees are separate from the principal amount for amortization purposes.

Richard Brent

2 years ago

A must have app for anyone with a mortgage. It took me a while to properly understand the different inputs but now that I have it's been invaluable in calculating different options for payments against a mortgage. Saved me £££ thanks to the developers.

A Google user

5 years ago

I love this app. I have been able to match my 1098 and loan disclosures to this app down to the penny. This app can do everything I want - Interest totals over the course of the loan, how my loan is affected if I make extra payments, and how much my monthly payment will be with escrow are just a few. There are also amortization tables. I love numbers and I feel like this app gives me the power to easily deal with lenders quickly so I can double check what I am being told. Get this app!

Cuong T

3 years ago

The problem with this app is when making "extra payment". It does not calculate the new balance when the interest rate changes. I made two loan account, one with extra payment and one without. For example, I made a $25000 extra payment in January then change the interst rate for April. The total payment for May should be lower then the account with no extra payment. Unfortunately, the total payment for both account are the same weather you put extra money or not.

Jean-Christophe Branche

1 year ago

I only had to use this app for a few minutes to grasp how powerful and well presented it is in totality. The icing on the cake was using the summary page to show my wife the projections and she was instantly able to follow something I would never have gotten her to understand with my excel amortization sheets (not an indictment on females). No hesitation in upgrading to support the dev.

Chelle

1 year ago

App just became unusable. While working on my own mortgage calculations, the app suddenly quit allowing me to make ANY changes and started randomly entering figures that make ZERO sense. Cannot clear any fields. Cannot start over. Cannot start with a clean slate unless I uninstall the app???

Kevin S

2 years ago

I don't write reviews, I had to for this app. There had to be a ton of work put into this calculator, it matches my bank perfectly and being able to select mortgage types for each country should make everyone who buys this very happy. I bought it primarily to see the impact of extra payments to pay down mortgage early. Thanks for this app, it was exactly what I needed.

DuckDuckGo IsMuchBetter

2 months ago

Liked the free version so much that I bought it. Besides no ads (which honestly I don't recall ever seeing any of in the free version), another unmentioned plus the the $1.99 version is it takes up a LOT less space, 2.88 MB versus just under 18 MB for the free version. That's probably due to the ads. Two bucks is a no-brainer.

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