Mortgage Calculator
Estimate your monthly home mortgage payments, principal, interest, taxes, and amortization.
Securing real estate in the United States requires navigating complex lending guidelines and bank underwriting requirements. The Mortgage Calculator is designed to analyze details of your home purchase budget, helping you estimate mortgage amortization, property tax escrow accounts, or private mortgage insurance (PMI) thresholds.
Whether you are comparing conventional, FHA, or VA financing options, this tool helps you check how different down payments and interest rates impact your total carrying costs. Understanding these calculations before meeting with a lender is crucial for protecting your credit and structuring home financing terms efficiently.
Loan Details
20.0% of home price
Monthly Payment
Total Monthly Payment (PITI)
Principal & Interest: $0
How to Use the Mortgage Calculator
To calculate your home financing costs, enter the key purchase parameters in the form above. Start with the home purchase price, your planned down payment (in dollars or percentage), and the interest rate. If you are modeling mortgages, select the loan term — typically a 15-year or 30-year fixed term.
You can also input localized estimates for property taxes, homeowners insurance, and monthly HOA fees. Click "Calculate" to run the amortization engine, which displays your monthly payment breakdown (PITI), total interest costs, and a full amortization schedule showing how equity grows over time.
Formula & Calculation Logic
Calculations inside the Mortgage Calculator rely on standard time-value-of-money and tax-bracket arithmetic. For amortization and loans, we use the standard annuity equation:
M = P * [ r(1 + r)^n ] / [ (1 + r)^n - 1 ]
where M is the monthly payment, P is the principal loan amount ($280,000), r is the monthly interest rate (0.065 / 12), and n is the total number of payments (360 months). Taxes are estimated progressively by applying standard deductions to gross income, with the remainder evaluated across IRS bracket percentages. Savings projections compounding monthly or annually apply standard exponential formulas to model long-term returns..
Taxes are estimated progressively by applying standard deductions to gross income, with the remainder evaluated across IRS bracket percentages. Savings projections compounding monthly or annually apply standard exponential formulas to model long-term returns.
Real Example Calculation
Let's look at a realistic US financial scenario. Suppose you want to calculate the cost of buying a home in the United States with a fixed-rate loan.
- Test Scenario: buying a home in the United States with a fixed-rate loan
- Test Inputs: Home Price: $350,000, Down Payment: $70,000 (20%), Interest Rate: 6.5% APR, Term: 30 years
Plugging these variables into our calculation model yields an output of $1,769.82 per month (Principal & Interest). Over the life of the calculation, this results in PMI is eliminated because of the 20% down payment, and you will pay $357,135 in total interest over 30 years. Using this tool allows you to plan your household budget under current IRS deductions. This illustrates how even small changes in interest rates or contribution amounts compound total results over time.
Frequently Asked Questions
How is my monthly mortgage payment calculated?
Your principal and interest (P&I) payment is calculated using the amortization formula: M = P[r(1+r)^n] / [(1+r)^n - 1]. But your total monthly housing cost (called PITI) also includes Property taxes, Insurance (homeowner's), and sometimes PMI if your down payment is under 20%. Our calculator includes all these components for a complete picture.
What is the average 30-year mortgage rate in the United States in 2026?
In 2026, average 30-year fixed mortgage rates in the US are in the 6.0%–7.5% range, depending on your credit score, down payment size, and lender. A rate below 6.5% is considered competitive. Improving your credit score from 680 to 740+ can reduce your rate by 0.5–1.0%, saving tens of thousands over the loan's life.
How much house can I afford on a $75,000 or $100,000 salary?
The standard US rule is that your total monthly housing costs should not exceed 28% of your gross monthly income (the "28/36 rule"). On $75,000/year ($6,250/month), your max PITI payment is ~$1,750. On $100,000/year, it's ~$2,333. Enter your income and these numbers into our calculator to find your target home price range.
Should I choose a 15-year or 30-year mortgage?
A 30-year mortgage has lower monthly payments but costs significantly more in total interest. A 15-year mortgage has higher payments but you'll pay 50–60% less in interest and build equity much faster. For example, on a $350,000 loan at 6.5%, the 30-year costs about $452,000 in total interest; the 15-year costs only about $194,000. Use this calculator to compare both.
What is PMI and when do I have to pay it?
PMI (Private Mortgage Insurance) is required by most US lenders when your down payment is less than 20% of the home's purchase price. It typically costs 0.5–1.5% of the loan amount annually, adding $100–$300/month to a typical payment. PMI can be canceled once you reach 20% equity in your home.
How much do I need for a down payment to buy a house in the US?
Conventional loans typically require 5–20% down, but FHA loans allow as little as 3.5% with a credit score of 580+, and VA loans (for veterans) and USDA loans (rural areas) can require 0% down. A larger down payment lowers your monthly payment, eliminates PMI sooner, and reduces total interest paid significantly.
What are closing costs and how much should I budget in the US?
Closing costs are fees paid at the time of purchase, typically 2–5% of the home purchase price. On a $300,000 home, expect $6,000–$15,000 in closing costs. These include lender fees, title insurance, appraisal, and prepaid taxes/insurance. Use our Closing Cost Calculator for a detailed breakdown.
How does refinancing affect my mortgage payment?
Refinancing replaces your existing mortgage with a new one — ideally at a lower rate or shorter term. If rates drop 1% or more below your current rate, refinancing typically makes financial sense (break-even is usually 2–3 years). Our calculator can also help you model a refinanced payment by simply entering your new loan amount, rate, and term.