Mortgage Calculator Online
Calculate monthly mortgage payments, total interest, and complete loan payoff schedule.
Input Parameters
Live Result
Details
Steps
Calculate Net Borrowed Principal (Home Price - Down Payment)
Calculate Monthly Principal & Interest (P&I) Amortization
Compute Full PITI Monthly Obligation
Quick Answer & Understanding Your Result
A Mortgage Calculator determines your total monthly housing payment (PITI: Principal, Interest, Property Taxes, Homeowners Insurance, and PMI) based on home price, down payment, loan term, and interest rate.
Core Components of a Monthly Mortgage Payment (PITI)
- Principal & Interest (P&I): Fixed monthly debt service computed via standard amortization annuity formulas.
- Property Taxes: Local municipal property taxes held in escrow (~0.5% to 2.5% of assessed property value annually).
- Homeowners Insurance (Hazard): Annual property casualty insurance split into 12 monthly escrow payments.
- Private Mortgage Insurance (PMI): Required when making a down payment of less than 20% on conventional loans.
Key Lending Benchmarks
- Standard Down Payment: 20% to avoid PMI (minimum 3% to 3.5% for conventional / FHA loans).
- Front-End DTI Ratio: Housing costs should ideally remain under 28% of gross monthly income.
Enter your home price, down payment, and interest rate above to calculate your comprehensive monthly payment.
Formula & Calculation Logic
Mathematical FormulaP is loan amount (Home Price - Down Payment); r is monthly interest rate; n is total months (e.g. 360 for 30 years).
Step-by-Step Guide
Enter Home Price
Input purchase price of the property.
Set Down Payment
Specify down payment percentage or dollar amount.
Enter Rate & Term
Input interest rate and select 15-year or 30-year fixed loan.
Review Total PITI
Inspect monthly payment breakdown including taxes and insurance.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| $400,000 Home with 20% Down ($320k Loan) at 6.5% | 20% down avoids PMI; fixed monthly payment of $2,022 pays off $320k principal. | ||
| 15-Year Fixed ($300,000 Starter Home, 10% Down at 5.75%) | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
Consumer Financial Protection Bureau (CFPB) - Mortgages Guide
Freddie Mac - Primary Mortgage Market Survey
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Monthly P&I = P × [r(1+r)ⁿ] / [(1+r)ⁿ - 1]
Last Reviewed: August 21, 2026
Primary Source: Consumer Financial Protection Bureau (CFPB) - Mortgages Guide
Reference Document: Freddie Mac - Primary Mortgage Market Survey
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated financial results are modeled based on standard financial and mathematical formulas. For actual contracts or commercial loans, official amortizations will depend on lender-specific terms, fees, and regulatory provisions.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.