# Karl's Mortgage Calculator

> Mortgage calculator for loan payments, early payoff, and cost analysis. (iPhone/iPad app by Karl Jeacle.)

- Source: https://appshunter.io/ios/app/karls-mortgage-calculator/id1025852681 (this page in markdown: same URL + `.md`)
- Developer: [Karl Jeacle](https://appshunter.io/developer/1025852680)
- Category: Finance, Business
- Price: Free
- Rating: 4.40/5 from 121 App Store ratings · 89 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 17 MB
- Languages: American English
- Released: 2015-12-04
- Data updated: 2026-08-18
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/karls-mortgage-calculator/id1025852681/reviews.md

## What is Karl's Mortgage Calculator?

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 ten 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.

## Key features

- Calculate mortgage payments
- Reverse mortgage calculation
- Factor in additional loan costs
- Support for Fixed and ARM loans
- Early payoff with extra payments
- Multiple currency support
- International mortgage types

## Recent user reviews (10 of 89)

All indexed reviews: https://appshunter.io/ios/app/karls-mortgage-calculator/id1025852681/reviews.md

### 5/5 — AMAZING APP!

*2026-05-30*

I absolutely LOVE this app! I’ve used it for two house mortgages running “what-if” scenarios trying to target reasonable early payoff dates and understanding how much money I save in interest I don’t have to pay the bank. The app is easy to use and easy to pivot your payoff strategy when financial changes happen and you have to put less or can put more into the house. Seeing the payoff graphs, tables, and summary views are so nice. I use all the features on this app. The app is simple but powerful. Very user friendly but not underpowered. Great job! This is probably the first review I’ve ever posted about a mobile app because I just loved it so much.

### 1/5 — PORN

*2026-04-12, version 2.5.2*

Can you explain why pornographic ads run across the bottom of each page of the app?

### 5/5 — Best Mortgage Scenarios

*2026-03-25*

If you want a detailed and easy to use calculator you can use to estimate future principal payments and payoff scenarios with both incremental monthly progress, monthly progress and overall totals - this is what you are looking for.

### 5/5 — Spot on!

*2025-11-10*

I have been using this calculator for about 4 years and it’s been spot on. The estimate has been accurate. I recommend it to all my clients.

### 5/5 — Exceptionally good!

*2025-11-09, version 2.5.2*

It has become a great tool for me in my daily work

### 1/5 — Does Not Work

*2025-10-17, version 2.5.2*

Unable to lock the values and it changes my previous inputs automatically when trying to input the numbers.

### 5/5 — Hands-down best Mortgage app

*2025-03-27, version 2.5.2*

Absolutely love this app such flexibility, and reporting. I immediately bought the paid version of the app instead.

### 5/5 — Have a Mortgage? Get This App!!

*2024-07-13, version 2.5.2*

This app has been a total game changer! It enabled us to assess our ability and to make a plan to pay off our mortgage sooner, which we did!! We cannot thank you enough Karl for developing this app, everyone with a mortgage should get it!

### 2/5 — Issues

*2024-04-30, version 2.5.2*

I used to love this app but now it doesn’t seem to calculate the extra payment no matter how I input it

### 4/5 — ₹

*2024-02-17, version 2.5.2*

Please add ₹ also

## Frequently asked questions about Karl's Mortgage Calculator

### What can this mortgage calculator do?

This app allows you to calculate mortgage payments based on principal, interest, and term. It can also reverse calculate any of these variables if the other three are known. You can factor in additional costs like PMI, taxes, and insurance to see their impact on your monthly payment.

### Does the app support different types of mortgages?

Yes, the calculator supports Fixed and Adjustable Rate Mortgages (ARM) with up to five interest rate changes. It also supports interest-only mortgage loans, providing flexibility for various borrowing situations.

### Can I calculate early mortgage payoff with this app?

Absolutely. The app enables you to plan for early mortgage payoff by adding extra payments. You can input one-off, monthly, or annual extra payments, and the calculator will show potential savings on your loan.

### What currencies and international mortgage types are supported?

The calculator supports the input and display of multiple currencies, making it versatile for international users. It also includes support for Canadian mortgages and UK annual rest mortgages.

### Is this app free to use?

The app is free to download and use, supported by advertisements. There are no in-app purchases mentioned, indicating a straightforward ad-supported model.

## Version history (last 5 releases)

### 2.7.1 — 2026-07-22

2.7.1
- Better screen zoom handling

### 2.7 — 2026-07-10

2.7
- Darker color scheme
- EU user consent for GDPR
- Indian currency
- Bug fixes

### 2.5.2 — 2023-05-30

2.5.2
- 50 extra payments (was 30)
- 50 interest rates (was 9)
- Fixed payments (negative amortization)
- Preserve term reduction on rate change setting
- Stacked amortization graph setting
- Zero interest rate is now valid
- Email subject is loan name
- Email breaks out monthly expenses
- 100B principal, 10B repay
- Remove ads menu option
- Fix only five interest rates saved
- Updated insurance rates
- Remove analytics tracking

### 2.2 — 2017-11-16

This app has been updated by Apple to display the Apple Watch app icon.

2.2
- USDA loans
- new FICO ranges and MGIC rates
- updated CMHC rates
- show total/LTV in tables
- highlight current date in tables
- more currencies added
- iPhone X support
- bug fixes

### 2.1 — 2017-05-23

Email report
Balloon loans
Bug fixes

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## More apps by Karl Jeacle

- [Karl's Mortgage Calculator Pro](https://appshunter.io/ios/app/karls-mortgage-calculator-pro/id1299095698)

All apps by Karl Jeacle: https://appshunter.io/developer/1025852680

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-18.*