How your monthly mortgage payment adds up
Your real monthly housing cost is far more than principal and interest. This calculator builds the full picture — the loan repayment plus property tax, home insurance, HOA dues, PMI, maintenance, and utilities — so you can see the true all-in number before committing to a home.
What goes into the payment
The core repayment (principal and interest) is fixed by your loan amount, interest rate, and term using the standard amortisation formula. On top of that sit property tax and insurance, any HOA fees, PMI if your down payment is under 20%, and the ongoing maintenance and utility costs that catch many first-time buyers off guard.
Ways to lower the monthly cost
A larger down payment shrinks the loan and removes PMI once you cross 20% equity. A longer term lowers the monthly payment but increases total interest, while a shorter term does the opposite. Even a small improvement in your interest rate can change the payment noticeably — try a few combinations to see the trade-offs side by side.
These figures are estimates to help you plan and are not a loan offer; your lender’s exact numbers depend on your credit, location, and loan product.
What does the mortgage calculator include?
This calculator includes principal & interest, property tax, home insurance, HOA fees, PMI (auto-calculated when down payment is under 20%), maintenance estimates, and monthly utilities — giving you the true all-in monthly cost.
What is PMI and when do I need it?
PMI (Private Mortgage Insurance) is required by most lenders when your down payment is less than 20% of the home's value. The calculator automatically estimates it at 0.6% of the loan annually and stops it once you reach 20% equity.
How is the principal and interest calculated?
It uses the standard amortisation formula based on the loan amount, annual interest rate, and term in years to calculate your fixed monthly payment.
Should I include maintenance costs?
Yes — most financial advisors recommend budgeting 1% of the home's value annually for maintenance and repairs. This calculator includes it as an adjustable field so you can see the real cost of ownership.
What is a good debt-to-income ratio for a mortgage?
Lenders typically prefer your total monthly debt payments (including the mortgage) to be under 43% of gross monthly income, with the mortgage itself under 28%.
Is a 30-year or 15-year mortgage better?
A 30-year mortgage has lower monthly payments but you pay significantly more interest over the life of the loan. A 15-year mortgage costs more each month but you build equity faster and pay far less total interest — often roughly half as much. Use this calculator to compare both terms side by side and see the difference for your loan amount.
How much does a 1% difference in interest rate matter?
On a $300,000 30-year mortgage, a 1% higher interest rate adds roughly $170–180 to the monthly payment and about $60,000+ in total interest over the loan term. Even a 0.5% difference is significant — always shop multiple lenders before committing.
What is an amortisation schedule?
An amortisation schedule shows how each monthly payment is split between paying down the principal and paying interest. In early years most of your payment is interest; over time the balance shifts toward principal. This is why extra payments in the first few years of a mortgage save the most interest.