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Karl's Mortgage Calculator Pro

by Karl Jeacle

  • Finance
  • Paid
  • Small & simple · 90
View on the App Store
Rating
4.8
10 ratings
Top 91%among 275 Finance apps
Last update
Jul 24, 2026
Version 2.7.1
Size
15 MB
Category
Finance
Tracked since
Oct 9, 2026

Estimated revenue

A model estimate with a likely range, not a reported figure.

No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.

How this estimate is made

Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.

Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.

Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.

Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.

Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.

Full method

Screenshots

As shown on the App Store listing.

About this app

Text from the App Store listing.

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.

What’s new

Release notes for the latest version, as written by the developer.

v2.7.1
Original · root

2.7.1

  • Darker color scheme
  • Indian currency
  • Bug fixes

Rank history

Daily position in the US charts. #1 is at the top.

Best rank
#13
Current rank
#90
Days charting
7 of 7

On the charts today

Small & simple score

How realistic it is for a small team to build something like this.

90/100

Small & simple

  • Developer size70% · 25

    Developer: 2 apps on the charts

  • Audience size100% · 20

    Ratings: 10

  • App size100% · 10

    Size: 15 MB

  • Price model100% · 15

    Price model: paid

  • Demand proof90% · 30

    Best rank #6, 22 countries

An indicator, not a fact. We can't see team size. Calculated Oct 25, 2026 · method i2

How the score works

Gap check · UK

Is this US chart app missing in UK?

In the UK store, not on any chart

Store check Oct 22, 2026

This is a candidate, not a verdict. Charts show at most 100 apps, so not charting does not mean no demand. Check the UK store before you decide.

See all gaps

Version history

  • 2.7.1LatestReleased Jul 24, 2026