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Mortgage Calculator

Last reviewed: May 2026

How to use the ToolBook Mortgage Calculator

Calculate your total monthly mortgage payment in seconds. Adjust any input to see the PITI breakdown, amortization schedule, payoff date, and year-by-year chart update instantly.

  1. Enter the home price

    Type or drag the slider to set the total purchase price of the home you are considering. The tool supports prices from $50,000 to $2,000,000.

  2. Set the down payment

    Choose your down payment as a percentage of the home price. The loan amount updates automatically. A 20% down payment avoids PMI on most conventional loans.

  3. Adjust the interest rate and loan term

    Enter the annual mortgage rate offered by your lender and pick the repayment term in years. Compare a 15-year vs 30-year term to see the trade-off between monthly payment and total interest.

  4. Add property tax and insurance

    Set the annual property tax rate (percentage of home value) and monthly homeowner's insurance premium. These are added on top of the principal and interest to show your full PITI payment.

  5. Include HOA fees and PMI if applicable

    Enter your monthly HOA dues and estimated PMI cost. PMI is typically required when your down payment is less than 20%. These are included in the total monthly payment calculation.

  6. Read the results

    The summary shows your total monthly payment broken into each component, plus the estimated payoff date and recommended income. Scroll down for the interpretation, year-by-year bar chart, and full amortization table.

Frequently asked questions

What is PITI in a mortgage payment?

PITI stands for Principal, Interest, Taxes, and Insurance. It represents the four components of a typical monthly mortgage payment. Principal reduces the loan balance, interest is what the lender charges, property taxes fund local government services, and insurance protects your home. We break down all four in the results so you can see exactly where every dollar goes.

How does a larger down payment affect my monthly cost?

A larger down payment reduces the loan amount, which lowers both the monthly principal-and-interest portion and the total interest paid over the life of the loan. Putting down 20% or more also lets you avoid private mortgage insurance (PMI), saving an additional $50 to $200+ per month depending on the loan size. Use the slider to compare different down payment scenarios instantly.

Should I choose a 15-year or 30-year mortgage?

A 15-year mortgage has higher monthly payments but a lower interest rate and dramatically less total interest. A 30-year mortgage keeps monthly payments affordable but costs significantly more over the full term. For example, on a $280,000 loan at 6.5%, a 30-year term costs roughly $357,000 in interest while a 15-year term costs about $147,000. We recommend trying both tenures in the calculator to see the trade-off for your specific numbers.

What is PMI and when is it required?

Private Mortgage Insurance (PMI) is required by most lenders when your down payment is less than 20% of the home price. PMI typically costs 0.5% to 1.5% of the original loan amount per year and is added to your monthly payment. Once your equity reaches 20%, you can request PMI removal. Use the PMI slider to add your estimated monthly cost and see how it affects your total payment.

Are HOA fees included in a mortgage payment?

HOA (Homeowners Association) fees are not part of the mortgage itself, but lenders include them when calculating your debt-to-income ratio and overall affordability. Monthly HOA fees typically range from $100 to $700+ depending on the community and its amenities. We include an HOA field so you can see the true total monthly housing cost in one place.

How is property tax estimated in this calculator?

We calculate monthly property tax as a percentage of the home price divided by 12. The default rate of 1.2% reflects the US national average, but actual rates vary widely by state and county, from under 0.5% in Hawaii to over 2% in New Jersey and Illinois. Adjust the property tax slider to match your local rate for a more accurate estimate.

What is the difference between fixed-rate and adjustable-rate mortgages?

A fixed-rate mortgage locks in the same interest rate for the entire loan term, so your principal-and-interest payment never changes. An adjustable-rate mortgage (ARM) starts with a lower introductory rate that resets periodically, usually after 5 or 7 years. ARMs can save money early on but carry the risk of higher payments later. This calculator models a fixed-rate loan. If you have an ARM, re-enter the new rate after each reset to see the updated payment.

How much income do I need to afford a mortgage?

A common guideline is the 28% rule: your total monthly housing payment (principal, interest, taxes, insurance, HOA, and PMI) should not exceed 28% of your gross monthly income. We calculate and display the recommended minimum annual income based on this rule so you can gauge whether a home fits your budget.

Does this calculator include closing costs?

No. Closing costs are one-time fees paid at the time of purchase and typically range from 2% to 5% of the loan amount. They include appraisal fees, title insurance, origination fees, and prepaid items like the first year of homeowner's insurance. We focus on the recurring monthly payment so you can plan your ongoing budget accurately.

How accurate is this mortgage calculator?

The principal-and-interest calculation is mathematically exact for a standard fixed-rate, fully amortizing loan. Property tax, insurance, HOA, and PMI are estimated based on the values you enter. Real-world payments may differ slightly due to escrow adjustments, lender-specific rounding, or rate changes. For budgeting and comparison purposes, the numbers are precise.