Karl's Mortgage Calculator Pro

186 reviews
Content rating
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About this app

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.
Updated on
May 29, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
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No data collected
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Ratings and reviews

170 reviews
Vikki Breadner
July 27, 2021
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 ๐Ÿ‘Œ
27 people found this review helpful
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A Google user
April 12, 2020
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!
18 people found this review helpful
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Cuong T
May 14, 2022
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.
2 people found this review helpful
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Dr Karl Jeacle
April 29, 2022
Hi Cuong T, I can't replicate this problem. When I enter an extra payment and then an interest rate change, the payment is lower for me. Have you changed any of the default loan settings? If you can email me more details, that would be useful. Thanks, Karl.

What's new

- Fix crash when small number of repayments
- Remove colours from report email

- Update FHA rates
- Fix reverse calculation when interest is zero

- Fix prepayment fields not displaying

- Fix Canadian insurance downpay %

- Fix rotation while in Settings