Mortgage Calculator
Calculate mortgage payments
Instructions
Enter Loan Amount
Input the total loan amount (principal) you're borrowing for your mortgage.
Enter Interest Rate and Term
Input the annual interest rate and loan term in years (typically 15 or 30 years).
Review Payment Details
See your monthly payment, total interest paid over the life of the loan, and total amount paid.
Formula
Monthly Payment = P × [r(1+r)^n] / [(1+r)^n - 1]
Where: P = Principal, r = Monthly Rate (Annual Rate / 12), n = Number of Payments (Years × 12)
Example 1: $300,000 Loan
Loan Amount: $300,000
Interest Rate: 6% annually (0.5% monthly)
Loan Term: 30 years (360 payments)
Monthly Payment = $300,000 × [0.005(1.005)^360] / [(1.005)^360 - 1]
Monthly Payment = $1,798.65
Total Interest = ($1,798.65 × 360) - $300,000 = $347,514
Example 2: $250,000 Loan at 4.5%
Loan Amount: $250,000
Interest Rate: 4.5% (0.375% monthly)
Loan Term: 30 years
Monthly Payment = $1,266.71
Total Interest = $205,017
About Mortgage Calculator
The Mortgage Calculator helps you with homebuyers, homeowners, and real estate professionals to calculate monthly mortgage payments, total interest costs, and the total amount paid over the life of a loan. This calculator uses the standard amortization formula to provide accurate payment calculations based on your loan amount, interest rate, and loan term. Understanding your mortgage payment is crucial for budgeting, loan comparison, and making informed home buying decisions.
This calculator helps you understand the true cost of borrowing by showing not just your monthly payment, but also the total interest you'll pay over the life of the loan. This information is essential for comparing different loan scenarios, understanding the impact of interest rates and loan terms, and planning your long-term financial commitments. Whether you're buying your first home, refinancing an existing mortgage, or comparing loan options, this calculator provides the insights you need.
The calculator uses the standard mortgage payment formula that accounts for compound interest, ensuring accurate calculations that match what lenders use. By inputting different scenarios, you can see how changes in interest rates, loan terms, or loan amounts affect your monthly payment and total interest costs. This helps you make informed decisions about down payments, loan terms, and whether to pay points to lower your interest rate.
When to Use This Calculator
- Home Purchase Planning: Calculate monthly payments before house hunting
- Loan Comparison: Compare different loan scenarios and interest rates
- Budget Planning: Determine if you can afford a specific loan amount
- Refinance Evaluation: Calculate new payment amounts when refinancing
- Interest Analysis: Understand total interest costs over the loan term
- Term Comparison: Compare 15-year vs. 30-year mortgage options
Why Use Our Calculator?
- Accurate Calculations: Uses standard mortgage payment formulas
- Complete Analysis: Shows monthly payment and total interest
- Easy to Use: Simple interface for quick calculations
- Free Tool: No registration or fees required
- Financial Planning: Helps with mortgage and home buying decisions
- Mobile Friendly: Calculate on any device
Understanding Mortgage Payments
Mortgage payments are calculated using an amortization formula that ensures each payment covers both interest and principal. In the early years of a mortgage, a larger portion of each payment goes toward interest, while in later years, more goes toward principal. This is why the principal balance decreases slowly at first and more rapidly as the loan matures.
The total interest paid over the life of a loan can be substantial. For example, on a $300,000 loan at 6% for 30 years, you'll pay approximately $347,514 in interest, nearly as much as the original loan amount. This is why it's important to understand the total cost of borrowing, not just the monthly payment. Making extra payments, choosing a shorter loan term, or securing a lower interest rate can significantly reduce total interest costs.
Real-World Applications
Home Purchase Decision: A buyer is considering a $350,000 home with 20% down ($70,000), resulting in a $280,000 loan. At 5.5% for 30 years, the monthly payment is $1,589.81, and total interest is $292,331. This helps them understand the full cost of homeownership.
15 vs. 30 Year Comparison: A borrower compares a $250,000 loan: 30 years at 5% = $1,342/month ($233,139 interest), while 15 years at 4.75% = $1,945/month ($100,100 interest). The 15-year loan saves $133,039 in interest but requires $603 more per month.
Refinance Analysis: A homeowner with a $300,000 balance at 6.5% ($1,896/month) considers refinancing to 5% ($1,610/month). The $286/month savings helps them evaluate if refinancing costs are worth it.
Important Considerations
- This calculator shows principal and interest only; add property taxes and insurance for complete payment
- Total interest paid is significant over 30-year loans; consider shorter terms to save interest
- Interest rates significantly impact monthly payments and total interest costs
- Making extra payments can reduce total interest and shorten loan term
- Loan terms affect both monthly payment and total interest (shorter terms = higher payments but less interest)
- Consider your long-term financial goals when choosing loan terms
Common Questions
How is monthly mortgage payment calculated?
Payments use the standard amortization formula so each month covers interest on the remaining balance plus principal, paying the loan to zero by the final month.
What's included in a mortgage payment?
Many people refer to PITI: Principal, Interest, Taxes, and Insurance. This tool estimates principal and interest only; add taxes, insurance, and HOA for a full housing payment.
How much interest will I pay over the life of the loan?
Total interest grows with rate, loan size, and term. Long 30-year loans often exceed the original principal in interest unless you prepay or refinance.
Should I choose a 15-year or 30-year mortgage?
15-year loans cost more each month but cut total interest and build equity faster. 30-year loans improve cash-flow flexibility; extra principal payments can mimic a shorter term.
How can I reduce my total interest paid?
Lower the rate, shorten the term, make biweekly or additional principal payments, or borrow less. Even one extra payment a year can shave years off a mortgage.
Does this calculator account for property taxes and insurance?
No. Budget those separately or use your lender’s escrow estimate to understand the full monthly housing cost.
Common Mistakes to Avoid
- Budgeting only P&I without taxes, insurance, PMI, or HOA
- Assuming the listed rate equals your locked APR after points and fees
- Choosing the longest term solely for the lowest payment
- Forgetting that ARM, interest-only, or balloon products need separate models