Closing Costs Calculator

Free Closing Costs Calculator: calculate closing costs instantly with transparent formula, worked examples and tips. No signup.

A mortgage calculator computes the monthly payment, total interest cost, and full amortization schedule for a home loan based on the loan amount, interest rate, and term. With the US median existing home price at $420,400 (Q1 2024, NAR) and 30-year fixed mortgage rates ranging from 6.5–8.0% in 2024, understanding the full cost of a mortgage — not just the monthly payment — is essential before committing to what will likely be the largest debt most Americans ever carry. Over 30 years at 7%, a $400,000 mortgage accumulates $558,035 in interest — nearly 40% more than the original loan amount. and are essential companion tools for homebuyer financial planning.

US mortgages come in several main types: conventional (Fannie Mae/Freddie Mac conforming, max $766,550 in 2024 for most counties), FHA (3.5% minimum down with 580+ credit score), VA (zero down for eligible veterans and active-duty service members), and USDA (zero down for eligible rural borrowers). The 30-year fixed mortgage accounts for roughly 70% of US originations, offering predictable payments and protection against rate increases. Adjustable-rate mortgages (ARMs) offer lower initial rates but carry reset risk after the fixed period — a 5/1 ARM is fixed for 5 years, then adjusts annually based on a benchmark index plus margin.

Enter the home price and your down payment — the loan amount is price minus down payment. Conventional loans require 20% down to avoid Private Mortgage Insurance (PMI); FHA loans require as little as 3.5% down.
Enter the interest rate — check the Freddie Mac Primary Mortgage Market Survey (PMMS) or Bankrate.com for current national average rates by loan type.
Select the loan term: 30-year (lower payments, more total interest), 15-year (higher payments, much less total interest), or a custom term.
Add monthly property tax (annual county tax ÷ 12 — typically 0.5–2.5% of assessed value annually), homeowners insurance (~$100–$200/month), and PMI (0.5–1.5%/year of loan amount if LTV exceeds 80%).
Read your total monthly PITI (Principal, Interest, Tax, Insurance) — this is the true cost lenders evaluate against your gross income for debt-to-income qualification.
Compare different down payment scenarios: every $10,000 more down on a $400,000 loan at 7% saves approximately $70/month and $25,000 in total interest over 30 years.

Mortgage payment and total cost formulas

Monthly P&I = L × r × (1 + r)^n ÷ [(1 + r)^n − 1] where L = loan amount, r = monthly rate (annual rate ÷ 12 ÷ 100), n = number of months.

Total interest = (Monthly payment × n) − Loan amount

Worked example: $380,000 loan ($400,000 price minus $20,000 down) at 7.00% for 30 years. r = 7 ÷ 12 ÷ 100 = 0.005833. Monthly P&I = $380,000 × 0.005833 × (1.005833)^360 ÷ [(1.005833)^360 − 1] = $2,529/month. Total interest = $530,442. Add PMI at 0.8% ($253/month until 20% equity), property tax $400/month, insurance $150/month: total PITI + PMI = approximately $3,332/month until PMI cancels at 80% LTV.

Understanding your mortgage result

Affordability guidelines and 2024 market context

Front-end DTI (mortgage PITI ÷ gross monthly income): 28% is the traditional guideline; 31% is the FHA maximum; up to 45% for conforming loans with strong compensating factors. For a $100,000/year household ($8,333/month gross), the 28% front-end limit allows ~$2,333 PITI. At 7% for 30 years, that supports a loan of approximately $305,000 — meaning a $381,000 purchase with 20% down. The median US home price of $420,400 (Q1 2024) requires approximately $115,000 gross income to meet standard affordability guidelines with 20% down at a 7% rate.

Finance tips and best practices

Improve your credit score before applying — a score of 760+ vs 680 can save 0.5–1.0% in rate. On a $400,000 loan that amounts to $130–$260/month or $47,000–$93,000 over 30 years.
Shop at least 3–5 lenders — rate differences of 0.5–1.0% between lenders on the same loan are common; always compare official Loan Estimates, not verbal quotes.
Consider buying points — each discount point costs 1% of the loan and typically reduces the rate by 0.25%. On a $400,000 loan, 2 points = $8,000 upfront; breakeven is approximately 4 years at current rate savings.
Request PMI cancellation at 80% LTV — the Homeowners Protection Act (HPA) requires automatic PMI cancellation at 78% LTV based on original value, but you can request cancellation at 80% with an updated appraisal.
Refinance when rates drop 0.75–1.0%+ and you plan to stay 3+ years — calculate breakeven: closing costs ÷ monthly savings = months to breakeven.
Consider a 15-year mortgage if the payment is affordable — the rate is typically 0.5–0.75% lower than the 30-year, and total interest paid is 50–60% less.

Average US 30-year fixed mortgage rate peak: 8.03% in October 2023 — the highest since 2000 (Freddie Mac PMMS).
US median existing home sale price Q1 2024: $420,400 (National Association of Realtors, 2024).
Monthly P&I on a $336,320 loan (20% down on the median home) at 7.00%: approximately $2,238. With PITI: typically $2,900–$3,400 depending on location and tax rate.
Americans originated $1.58 trillion in mortgages in 2023 — down sharply from $4.4 trillion in 2021 due to rate increases (Mortgage Bankers Association, 2024).

Common mistakes to avoid

Evaluating affordability by monthly payment alone — a $2,500 P&I payment at 7% for 30 years costs $500,000+ in total interest; the same payment at 7% for 15 years costs only $150,000.
Forgetting closing costs — typically 2–5% of the loan amount ($8,000–$20,000 on a $400,000 loan); these are due at closing and must be included in upfront affordability analysis.
Underestimating ongoing ownership costs — property taxes, insurance, HOA fees, and maintenance (budget 1–2% of home value annually) add substantially to the true monthly cost of homeownership.
Choosing an ARM without modeling rate risk — a 5/1 ARM at 5.5% could adjust to 8.5%+ after year 5 if rates are elevated; always calculate the worst-case payment before selecting an ARM.

Mortgage calculations are mathematical illustrations and do not constitute a mortgage offer, commitment to lend, or financial advice. Actual payments include escrow for property taxes and homeowners insurance, and PMI if LTV exceeds 80%. The Truth in Lending Act (TILA) and RESPA require lenders to provide a standardized Loan Estimate within 3 business days and a Closing Disclosure 3 days before closing. Conventional conforming loan limits ($766,550 in most counties for 2024) and FHA loan limits are set annually by FHFA and HUD. Consult a licensed mortgage professional (NMLS-registered) or a HUD-approved housing counselor (free at HUD.gov) for personalized guidance.