Mortgage Calculator
Know Your Payment Before You Buy
Buying a home is likely the largest financial decision you’ll ever make — and yet most buyers don’t know their real monthly payment until they’re sitting across from a lender. Our free mortgage calculator changes that. In under two minutes, you’ll see a complete, accurate monthly payment estimate that includes principal, interest, property taxes, homeowner’s insurance, PMI, and HOA fees.
Use it to set a realistic budget, compare loan scenarios, and walk into every lender conversation already knowing your numbers. Scroll down to use the calculator, then read our in-depth guide on everything mortgages below.
Mortgage Payment Calculator
Adjust any field — results update instantly when you click Calculate
What Is a Mortgage Calculator — and Why You Need One
A mortgage calculator is a digital tool that applies the standard loan amortization formula to your specific inputs, estimating the monthly cost of buying a home. Unlike a rough estimate, a good calculator factors in every component of your housing payment: the principal and interest on the loan itself, property taxes, homeowner’s insurance, private mortgage insurance (PMI) if applicable, and HOA fees.
The reason this matters: most buyers dramatically underestimate their total monthly payment by focusing only on the principal and interest. Adding taxes and insurance alone can increase your payment by 20–40% depending on your location and loan size.
Understanding Every Input in the Calculator
Home Price & Down Payment
Your loan amount is the difference between the home price and your down payment. A larger down payment means a smaller loan, lower monthly payment, and less interest paid over time. Crucially, a down payment of 20% or more eliminates PMI — private mortgage insurance that protects the lender and can cost $50–$300/month.
Interest Rate
Even a small rate difference has an outsized impact over 30 years. On a $350,000 loan, the difference between 6.5% and 7.0% is roughly $110/month — and over $39,000 in total interest paid. Use the calculator to model the exact difference for your loan size before accepting any rate.
Loan Term
The 30-year fixed rate is the most common mortgage in the United States because it offers the lowest monthly payment. But it comes at a significant cost: you’ll pay interest for twice as long as a 15-year loan. The right term depends on your cash flow, financial goals, and how long you plan to stay in the home.
- 30-year loan: Lowest monthly payment, most flexibility, most total interest paid.
- 15-year loan: Higher monthly payment, builds equity twice as fast, saves tens of thousands in interest.
- 20-year loan: A good middle ground many buyers overlook — meaningfully lower interest than 30 years with a more manageable payment than 15.
Pro tip: If you take a 30-year loan but make one extra payment per year, you can cut roughly 4–5 years off the loan term and save thousands in interest — with none of the commitment of a shorter-term loan.
What Is PMI and When Can You Remove It?
Private Mortgage Insurance is required on conventional loans when your down payment is less than 20% of the home’s value. It protects the lender — not you — against default risk. PMI typically costs between 0.5% and 1.5% of the loan amount annually, divided into monthly payments.
The good news: PMI is not permanent. Once your loan-to-value ratio (LTV) drops to 80% — either through payments, appreciation, or both — you can request PMI removal. Under the Homeowners Protection Act, lenders must automatically cancel PMI when your LTV reaches 78% based on original value.
How to Use the Amortization Table
The amortization schedule is one of the most illuminating outputs of any mortgage calculator, and one of the most overlooked. It shows you, year by year, exactly how much of each payment goes to principal versus interest.
In the early years of a 30-year mortgage, the overwhelming majority of each payment goes toward interest. On a $400,000 loan at 6.8%, your first payment of ~$2,607 includes only $339 in principal — the rest is interest. This ratio gradually shifts over time as your balance decreases.
Understanding this curve helps you make smarter decisions about extra payments, refinancing timing, and how long to stay in a home before selling.
Before You Talk to a Lender: Use This Calculator First
Many buyers make the mistake of letting a lender define their budget for them. Getting pre-approved for $500,000 doesn’t mean you should borrow $500,000. Run your own scenarios first, establish the monthly payment you’re comfortable with, and work backward to find the home price that fits your real budget — not the maximum you could technically qualify for.
Frequently Asked Questions
Our calculator uses the standard loan amortization formula and produces accurate estimates for fixed-rate mortgages. Property tax and insurance figures depend on the values you enter — use your actual local tax rate and insurance quote for the most accurate result. The calculator does not account for closing costs, which are typically 2–5% of the loan amount and paid separately at closing.
For a conventional loan, most lenders require a minimum credit score of 620, though scores of 740+ will qualify you for the best available rates. FHA loans allow scores as low as 580 (with 3.5% down) or even 500 (with 10% down). VA and USDA loans often have more flexible requirements. Your credit score is one of the most powerful levers on your interest rate — improving it before applying can save significant money over the life of the loan.
A common guideline is the 28/36 rule: spend no more than 28% of your gross monthly income on housing costs, and no more than 36% on all debt payments combined. For a household earning $8,000/month, that means a maximum housing payment of $2,240. Use our calculator to find the home price that produces a payment at or below that threshold — factoring in taxes and insurance, not just principal and interest.
It depends on your priorities. A 15-year mortgage typically offers a lower interest rate, builds equity twice as fast, and saves a substantial amount in total interest — but requires a significantly higher monthly payment. A 30-year mortgage gives you more monthly cash flow and flexibility but costs more in total. If you can comfortably afford the 15-year payment without straining your budget, it’s often the better long-term financial choice. If the higher payment would leave you without an emergency fund or retirement contributions, the 30-year gives you room to breathe.
PMI (Private Mortgage Insurance) is required on conventional loans when your down payment is less than 20% of the home’s purchase price. It protects the lender — not you — and typically costs 0.5%–1.5% of the loan amount per year. You can avoid PMI by: (1) making a 20% down payment, (2) using an 80-10-10 piggyback loan, (3) choosing a VA loan if you’re eligible (no PMI required), or (4) choosing a lender-paid PMI option that rolls the cost into a slightly higher interest rate.
Yes — dramatically so, especially in the early years of the loan when most of your payment goes toward interest. On a 30-year $350,000 loan at 6.8%, making just one extra payment per year reduces your loan term by approximately 4–5 years and saves over $60,000 in interest. Even adding $100–$200/month to your principal payment every month compounds significantly over time. The key is to specify that extra payments are applied to principal, not future interest.
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