Mortgage Calculator
Calculate monthly mortgage payments and total cost.
How to use Mortgage Calculator
Enter Your Loan Amount
Locate the 'Loan Amount' field at the top of the calculator. Type the total home price or loan amount in dollars (e.g., 350000). The field accepts values from $10,000 to $10,000,000.
Input Your Interest Rate
Click the 'Interest Rate (%)' field below the loan amount. Enter your annual interest rate as a decimal (e.g., 6.5 for 6.5%). Use rates between 2% and 12% for typical mortgages.
Set Your Loan Term
Select the 'Loan Term (Years)' dropdown menu. Choose 15, 20, or 30 years. The most common selection is 30 years for primary mortgages.
View Your Results
Results display automatically below the input fields showing: Monthly Payment (principal + interest), Total Amount Paid over loan term, and Total Interest Paid. All values update in real-time as you adjust inputs.
Adjust and Compare
Modify any field to see instant calculations. Compare scenarios like different interest rates or loan terms side-by-side. No need to reset—simply edit values and results recalculate immediately.
How to Use a Mortgage Calculator Online — Free Guide (2025)
A mortgage calculator helps you understand your monthly payments and total borrowing costs before applying for a home loan. This free online tool instantly shows your principal, interest, and total costs based on loan amount, interest rate, and term length.
Why Use a Mortgage Calculator?
Understanding your mortgage payment matters. Most homebuyers don't realize how much interest they'll pay over 30 years. A $350,000 loan at 6.5% interest costs approximately $432,000 in total payments—meaning $82,000 goes to interest alone. Using a mortgage calculator helps you make informed decisions about down payments, loan terms, and home prices you can actually afford.
Step-by-Step Guide to Calculate Your Mortgage
Step 1: Determine Your Loan Amount
Start with your home's purchase price, then subtract your down payment. Most lenders require 3%-20% down. For example: $400,000 home - $80,000 (20% down) = $320,000 loan amount. Enter this number in the 'Loan Amount' field.
Step 2: Find Your Interest Rate
Your interest rate depends on several factors: credit score (700+ gets better rates), down payment percentage (20% down typically gets 0.5% lower rates), loan type (Conventional vs. FHA), and current market conditions. Check your lender's quote or visit Freddie Mac's Primary Mortgage Market Survey for current rates. Enter this rate in the calculator—for example, 6.5 for a 6.5% rate.
Step 3: Choose Your Loan Term
Most mortgages are either 15-year or 30-year terms. A 30-year mortgage offers lower monthly payments ($2,228 on $350,000 at 6.5%), while a 15-year mortgage has higher monthly payments ($2,927) but saves about $150,000 in interest. Select your preferred term from the dropdown.
Step 4: Review Your Results
The calculator instantly displays three key numbers: Monthly Payment (principal + interest), Total Amount Paid (all payments combined), and Total Interest Paid (money going to lender). Use these numbers to evaluate affordability and compare different scenarios.
Practical Mortgage Calculator Tips
Compare Multiple Scenarios
Test different loan amounts, interest rates, and terms. See how putting down 15% versus 20% affects your monthly payment. Calculate how a 1% interest rate difference impacts your total cost. For example: $350,000 at 5.5% costs $1,981/month, while 6.5% costs $2,228/month—a $247 monthly difference.
Don't Forget Additional Costs
The calculator shows principal and interest only. Your actual monthly payment (called PITI) includes: Principal and Interest, Property Taxes (0.3%-1.5% of home value annually), Insurance ($800-$1,500 annually), and sometimes HOA fees or PMI (Private Mortgage Insurance if down payment is under 20%).
Use Current Market Rates
Interest rates change daily. As of 2025, rates typically range from 5.5%-7.5% depending on loan type and creditworthiness. Check your lender's current rates before calculating. Even a 0.5% difference significantly affects your total cost.
Account for Your Credit Score Impact
Borrowers with 760+ credit scores get the best rates. Those with 620-639 scores may pay 1.5%-2% higher rates. If your credit needs improvement, calculating your potential payment at different rate tiers helps set savings goals.
Common Mortgage Calculator Questions Answered
What's considered affordable?
Lenders typically approve mortgages up to 28% of your gross monthly income (housing costs) or 36% of total debt. Earn $5,000/month? You could afford roughly $1,400 monthly in housing costs.
Should I get a 15-year or 30-year mortgage?
Choose 30-year if you value flexibility and lower monthly payments. Choose 15-year if you can afford higher payments and want to build equity faster. A middle ground: 30-year with extra monthly principal payments (like paying $2,500 monthly instead of $2,000).
How does a larger down payment help?
Larger down payments lower your loan amount, reduce monthly payments, and eliminate PMI (mortgage insurance). A $100,000 down payment versus $50,000 reduces your loan by $50,000—saving roughly $150,000 in interest over 30 years.
Next Steps After Calculating
Once you've used the mortgage calculator to find your target payment, get pre-approved with a lender to lock in actual rates. Compare offers from at least 3 lenders—rates vary by $100+ monthly. Review all terms carefully, including closing costs, prepayment penalties, and rate lock periods.
Start your home-buying journey with accurate numbers. Use this free mortgage calculator today to see exactly what you'll pay and make confident decisions about homeownership.