David Chen is a Certified Financial Analyst with over 10 years of experience in mortgage analytics and iOS financial-app design.
Use this web clone of Karl’s Mortgage Calculator Apple to generate fast P&I, total interest, and payoff timelines—identical logic to the iconic iOS app, no download required.
Karl’s Mortgage Calculator Apple Clone
Karl’s Apple-Style Formula
Monthly P&I: M = P × [ r(1+r)^n ] / [ (1+r)^n – 1 ]
Extra Payments: Subtract from principal each month; recalculate amortisation.
Formula Sources: Karl’s iOS App | A+ FCU
Variables
- Principal: Original loan amount.
- Interest Rate: Annual nominal rate.
- Term: Amortisation period in years.
- Extra per Month: Additional principal payment (Karl-style).
Related Calculators
- Karl’s Bi-Weekly Calculator
- Karl’s Refinance Calculator
- Karl’s Lump-Sum Calculator
- iOS-Style Amortisation Table
What Is Karl’s Mortgage Calculator Apple Clone?
It replicates the exact logic and clean UI of the iconic iOS app: instant P&I, total interest, and time saved with extra payments. No download, no ads, mobile-first—perfect for quick client demos or personal use.
How to Use Karl-Style Calculator (Example)
- Enter the loan principal (e.g., $400,000).
- Input the interest rate (e.g., 6.2%).
- Set the term (e.g., 30 years).
- Add any monthly extra (e.g., $200) and click “Calculate” to see months saved and interest reduction.
Frequently Asked Questions (FAQ)
Does this match Karl’s app exactly? Yes—same formula and extra-payment logic to the cent.
Can I use this on iPhone Safari? 100% responsive; save to home screen for instant Karl-style access.
Are comparison rates included? No—add any fees manually to compute your personal comparison rate.
Is the amortisation table exportable? This widget gives summary totals; duplicate the formula in Excel for full schedules.