Complete User Manual
Mortgage Pro Calculator App
π Overview
Mortgage Pro Calculator App calculates your estimated monthly mortgage payment in real time. All data is saved automatically between sessions. Tap the trash icon to reset all fields.
Required fields are highlighted in orange β enter your Purchase Price, Down Payment %, Interest Rate %, and Gross Monthly Income to unlock all calculations.
π³ Summary Card
The card at the top of the screen shows your total estimated monthly payment, broken down into four components:
| P&I | Principal & Interest β the core loan repayment |
| Tax | Monthly property tax |
| PMI | Private Mortgage Insurance (shown only when down payment is under 20%) |
| HOA/Ins | Monthly HOA + homeowner's insurance combined |
P&I + Monthly Tax + Insurance + PMI + HOA
Ζ Loan Calculations
All mortgage math uses the standard fixed-rate amortization formulas.
Purchase Price Γ (Down Payment % Γ· 100)
Purchase Price β Down Payment Amount = Purchase Price Γ (1 β Down Payment % Γ· 100)
r = Annual Rate % Γ· 100 Γ· 12
n = Loan Term (years) Γ 12
P&I = L Γ r Γ (1 + r)βΏ Γ· ((1 + r)βΏ β 1)
where L = Loan Amount
r = Monthly Interest Rate
n = Number of Payments
P&I Γ n
(P&I Γ n) β Loan Amount
LTV % = Loan Amount Γ· Purchase Price Γ 100 PMI is required when LTV > 80% (i.e. down payment < 20%)
π Monthly Payment Breakdown
Purchase Price Γ (Property Tax Rate % Γ· 100) Γ· 12
Each payment splits into interest and principal portions:
Remaining Balance Γ r where r = Annual Rate % Γ· 100 Γ· 12
P&I Payment β Interest Portion
Previous Balance β Principal Portion
Early in the loan, the interest portion is large and the principal portion is small. Over time this reverses β each payment chips away more principal and less interest.
π Escrow & PMI
| Property Tax % | Annual tax rate as a % of purchase price, divided by 12 for the monthly amount |
| Monthly PMI | Appears automatically when down payment is under 20% |
| Monthly Insurance | Homeowner's insurance monthly premium |
| Monthly HOA | Homeowners Association monthly fee |
All escrow fields are optional. Leave blank to treat as $0.
π DTI Analyzer
Debt-to-Income ratio is one of the primary metrics lenders use to evaluate loan eligibility. Enter your income and monthly debts to see your DTI in real time.
Car + Student Loan + Personal Loan + Credit Card Min + Other Debt
DTI % = (Total Monthly Payment + Total Monthly Debts)
Γ· Gross Monthly Income Γ 100
This is the DTI shown in the app
= Total Monthly Payment Γ· Gross Monthly Income Γ 100 Lenders typically want this below 28%
DTI thresholds:
| DTI | Assessment |
|---|---|
| β€ 43% | Good β acceptable to most conventional lenders |
| 44% | Borderline β some lenders may approve |
| 45β49% | Elevated risk β harder to qualify |
| 50%+ | Exceeds most lender limits |
Use the Mo / Annual toggle next to the income field to switch between entering monthly or annual income. The app converts automatically.
π Amortization & Extra Payments
The amortization chart plots two curves over the life of the loan by year:
| Green line | Remaining principal balance |
| Orange line | Cumulative interest paid to date |
| Dashed lines | Standard (no extra payment) scenario, shown for comparison when an extra payment is active |
| Purple marker | Breakeven Year |
| Green marker | Early Payoff Year (with extra payment) |
The point where: Cumulative Interest Paid = Remaining Principal Balance Before this year, you've paid more in interest than you've built in equity. After this year, your equity exceeds total interest paid.
New Balance = Old Balance β (Regular Principal + Extra) Each extra dollar paid toward principal reduces the balance on which future interest is calculated. This compounds β each reduction lowers all future interest charges.
Standard Payoff Months β Accelerated Payoff Months
(Standard Total Interest) β (Accelerated Total Interest)
= [(P&I Γ n) β L] β [(Accel P&I Γ m) β L]
where m = accelerated payoff month
n = standard term in months
L = Loan Amount
extraStartMonth = (Start Year β 1) Γ 12 + 1 Months 1 through extraStartMonth β 1: standard payment only From extraStartMonth onward: payment + extra principal Example: Start Year = 5 means the first 4 years follow the normal schedule; accelerated payoff begins in month 49.
Even a small extra payment each month β $50 or $100 β can eliminate years from your loan and save tens of thousands in interest. The chart updates in real time.
β PDF Export
Tap the share icon (β) in the top-right corner of the main screen to generate a 2-page mortgage summary PDF.
| Page 1 | Loan details, monthly payment breakdown, DTI analysis, amortization chart |
| Page 2 | Full year-by-year amortization schedule β principal paid, interest paid, and remaining balance for each year |
To export this User Manual as a PDF, tap the share icon (β) in the top-left corner of the User Manual screen. From the share sheet you can save, print, AirDrop, or export to any app.
Note: An ad may be displayed before the PDF preview on some exports.
β οΈ Disclaimer
Consult a licensed mortgage or financial professional before making any financial decisions. The developer assumes no liability for decisions made based on these calculations.
Mortgage Pro Calculator App Privacy Policy
Effective Date: June 19, 2026
π Privacy Policy
This privacy policy applies to the Mortgage Pro Calculator App or Mortgage Pro App for mobile devices, together with any related services operated by XMR Enterprises Inc. (collectively, the βApplicationβ). XMR Enterprises Inc. is hereby referred to as the βService Provider.β
βΉοΈ Information Collection and Use
The Application collects information when you download and use it. This information may include information such as:
- Your device's Internet Protocol address
- The pages of the Application that you visit, the time and date of your visit, and the time spent on those pages
- The time spent on the Application
- The mobile operating system you use
β Cookies and Tracking Technologies
The Application or its third-party SDKs may use cookies, SDKs, pixels, and similar technologies to support functionality, analytics, or service delivery. Where required by applicable law, the Service Provider will obtain consent before using non-essential tracking technologies.
β Your Rights
You may request access to, correction of, or deletion of your personal data held by the Service Provider. To exercise these rights, or to withdraw consent where processing is based on consent, contact the Service Provider at lendingpulseapp@gmail.com.
CA Your California Privacy Rights (CCPA/CPRA)
If you are a California resident, you have the right to know what personal information is collected, the right to delete personal information, the right to opt out of the sale or sharing of personal information, and the right to non-discrimination for exercising these rights. To exercise your CCPA/CPRA rights, contact the Service Provider at lendingpulseapp@gmail.com.
β Third Party Access
Only aggregated, anonymized data is periodically transmitted to external services to aid the Service Provider in improving the Application and its service. The Service Provider may share your information with third parties in the ways described in this privacy statement. Data Collection & Advertising Mortgage Pro Calculator App is supported by advertising provided by Google AdMob. AdMob may collect the following data from your device: β’ Device Identifier (IDFA/IDFV): Used to serve personalized or non-personalized advertisements and to measure ad performance. This identifier may be used across apps and websites owned by other companies. β’ App Interaction Data: Information about how you interact with ads displayed within the app, used for analytics and advertising purposes. β’ Crash & Diagnostic Data: Technical data collected to maintain app stability and performance. All financial data you enter in the app (purchase price, income, loan details, debts) is stored locally on your device only and is never transmitted to our servers or any third party.
π International Data Transfers
The Service Provider or its third-party service providers may transfer personal data to countries outside your country of residence, including outside the European Economic Area, where data-protection laws may differ from those in your country.