Mortgage Calculator
Calculate your monthly mortgage payments based on loan amount, interest rate, and term.
Your Results
Enter your details and click calculate to see your results.
What This Calculator Does
This mortgage payment calculator helps real estate professionals, investors, and homebuyers estimate monthly mortgage payments based on the loan amount, interest rate, and loan term. It factors in down payment, property taxes, and insurance to give you a comprehensive view of your total monthly housing cost. The tool also generates a first-year amortization schedule so you can see exactly how much of each payment goes toward principal versus interest.
The Formula
In this formula, M represents the monthly payment, P is the principal loan amount (home price minus down payment), r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments (loan term in years multiplied by 12).
Step-by-Step Example
Determine the principal
Start with the home price of $300,000. Subtract a 20% down payment ($60,000) to get a principal loan amount of $240,000.
Convert the interest rate
Take the annual interest rate of 6.5% and divide by 12 months. This gives you a monthly rate of 0.5417% (or 0.005417 as a decimal).
Calculate total payments
Multiply the loan term of 30 years by 12 months to get 360 total monthly payments over the life of the loan.
Apply the formula
Plugging in P = $240,000, r = 0.005417, and n = 360, the formula yields a monthly principal and interest payment of approximately $1,517.
Real-World Use Cases
First-Time Homebuyer
Compare monthly payments for different home prices and down payment amounts to determine an affordable budget.
Real Estate Investor
Calculate mortgage payments on a rental property to determine if expected rental income provides positive cash flow.
Refinancing Homeowner
Compare your current payment with a potential refinanced payment at a lower rate to see potential savings.
Common Mistakes to Avoid
Forgetting to subtract the down payment from the home price before calculating.
Using the annual interest rate directly instead of converting to a monthly rate by dividing by 12.
Ignoring property taxes and homeowners insurance, which can add $300 to $600+ per month.
Not accounting for PMI if your down payment is less than 20%.
Assuming the total cost equals the purchase price. Over 30 years at 6.5%, you may pay over $300,000 in interest alone.
Frequently Asked Questions
Accuracy and Disclaimer
This calculator provides estimates for informational purposes only. Results may not reflect your actual mortgage terms. Consult a licensed mortgage professional before making real estate or lending decisions.
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