Global Mortgage Suite
High-precision mortgage calculations for US, UK, and KR markets.
Loan Parameters
Additional Costs
Estimated Monthly Payment
$3,469
Total Interest
$637,722
Total Paid
$1,248,722
Amortization Advantage
Paying just $347 extra monthly could save you $95,658 in interest.
Global Context
Your United States rate is 6.5% lower than the global high of 14.2% this quarter.
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Connect with verified lenders in our United States network to lock in this rate.
How Mortgage Payments Are Calculated
Overview
A mortgage is a loan secured by real estate, repaid in equal monthly installments over a fixed term — typically 15 to 30 years. Each payment goes partly toward interest (more in the early years) and partly toward principal (more in later years). Understanding how this 'amortization' works helps you make smarter decisions about loan terms, down payments, and refinancing opportunities. A small change in the interest rate or term can translate to tens of thousands of dollars over the life of the loan.
How It Works
The standard formula is M = P × [r(1+r)^n] / [(1+r)^n − 1], where M is the monthly payment, P is the loan principal, r is the monthly interest rate (annual rate ÷ 12), and n is the number of payments (years × 12). For a $300,000 loan at 6% annual interest over 30 years, this works out to roughly $1,799 per month — of which only $300 goes to principal in month 1, but $1,790 by month 360. Total interest paid: $347,514.
When to Use This
Run this before house hunting to know what monthly payment you can comfortably afford. Compare 15-year vs 30-year terms to see how much interest a shorter loan saves. Test the impact of putting an extra 5% down. Use it again every few years to evaluate whether refinancing makes sense — if current rates are 1%+ below your existing rate, refinancing often pays for closing costs within 2–3 years.
Frequently Asked Questions
Does this include property tax and insurance?
This calculator shows principal and interest (P&I) only. Your actual monthly payment (PITI) also includes property tax, homeowners insurance, and possibly mortgage insurance (PMI). Add roughly 1.5–2.5% of home value annually for taxes + insurance, divided by 12.
Is a 15-year mortgage really better?
Mathematically, yes — total interest paid is dramatically lower (often less than half). But monthly payments are 40–50% higher. A 30-year mortgage offers flexibility (you can voluntarily pay extra) without committing to the higher payment.
What's a good interest rate?
Rates vary by year, credit score, and loan type. As of mid-2020s, 30-year fixed rates have ranged from ~3% to ~8%. Compare your rate to the current 30-year fixed average — if you're 0.5%+ above, shop around.
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