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About the Mortgage Calculator
Buying a home is likely the largest financial commitment most people will make in their lifetime. A mortgage is simply a loan secured by real property, typically repaid in equal monthly instalments over 15 or 30 years. This calculator helps you understand your monthly payment, total interest cost, and full amortisation schedule before you sign anything.
How the calculation works
Each monthly mortgage payment has two main components: principal (the portion that reduces your loan balance) and interest (the lender's fee for the loan). Early in the amortisation schedule, the vast majority of each payment is interest; over time, the principal portion grows. This is why making extra principal payments early in a loan has an outsized effect on total interest paid and payoff time.
Fixed vs. adjustable rate mortgages
A fixed-rate mortgage locks your interest rate for the life of the loan, making monthly payments predictable regardless of what happens to broader interest rates. An adjustable-rate mortgage (ARM) offers a lower initial rate that resets periodically based on a benchmark index plus a margin. ARMs can save money if rates fall or if you plan to sell before the first adjustment, but they introduce risk if rates rise significantly.
Down payment and private mortgage insurance
Your down payment directly reduces the loan amount and affects your interest rate and monthly payment. Putting down less than 20% on a conventional loan typically triggers private mortgage insurance (PMI), an additional monthly cost that protects the lender against default. PMI generally ranges from 0.5% to 1.5% of the loan amount annually and can be removed once you reach 20% equity.
Amortisation and building equity
Amortisation is the process of paying off a loan through regular instalments. In the early years of a 30-year mortgage, you build equity very slowly because most of each payment covers interest. By year 10, the balance may have dropped by less than you expect. Making even one extra principal payment per year can shorten a 30-year mortgage by several years and save tens of thousands of dollars in interest.
Refinancing considerations
Refinancing replaces your existing mortgage with a new one, usually to get a lower rate, change the term, or access home equity. The key metric is the break-even point: divide your closing costs by your monthly savings to find how many months it takes to recoup the refinancing expense. If you plan to move before reaching that break-even, refinancing likely does not make financial sense regardless of the rate improvement.
Frequently Asked Questions
What credit score do I need to qualify for a mortgage?
Most conventional lenders require a minimum credit score of 620, though scores below 740 typically come with higher interest rates. FHA loans are available with scores as low as 580 (with 3.5% down) or even 500 (with 10% down). The higher your score, the lower your rate — improving a score from 680 to 740 can save a quarter-point or more on a 30-year mortgage.
How much house can I afford?
A common rule of thumb is to keep total housing costs (principal, interest, taxes, and insurance) below 28% of gross monthly income, and total debt payments below 36%. At current rates, a household earning $100,000 per year might qualify for a mortgage in the $350,000–$450,000 range depending on existing debts, down payment, and local property taxes.
What are closing costs and how much should I expect?
Closing costs typically total 2%–5% of the loan amount and include origination fees, appraisal, title insurance, attorney fees, prepaid interest, and escrow setup. On a $300,000 loan, expect $6,000–$15,000 in closing costs. Some lenders offer no-closing-cost mortgages that roll these fees into a higher rate — useful if you plan to sell or refinance within a few years, but more expensive long-term.
Is a 15-year mortgage better than a 30-year?
A 15-year mortgage carries a lower rate (typically 0.5–0.75% less than a 30-year) and builds equity much faster, but requires significantly higher monthly payments. The 30-year offers lower payments and more financial flexibility. Mathematically, the 15-year wins on total interest paid; many households benefit from the lower required payment of the 30-year even if they make extra principal payments voluntarily.
Disclaimer
Actual loan terms depend on creditworthiness, lender criteria, and market conditions, and may differ materially from these estimates.
This calculator is for informational and educational purposes only. Results are estimates based on the inputs you provide and assumptions that may not reflect your actual situation. It does not constitute financial, investment, tax, legal, or accounting advice. Verify results independently and consult a qualified professional before making financial decisions. Digital.Finance makes no guarantee of accuracy or completeness.