Mortgage Calculators & Home Loan Tools

The 30-year fixed mortgage rate has settled into the 6.2–6.4% range through Q1 2026, down from the cycle peak above 7.7% in late 2023 but well above the sub-3% rates that defined 2020–2021. The Federal Reserve's holding pattern through Q4 2025 — pausing after the cumulative rate hikes of 2022–2024 — combined with cooling inflation has stabilized the long end of the curve, and Freddie Mac's weekly Primary Mortgage Market Survey has shown rates within a 30-basis-point band for nine consecutive weeks.

The headline issue isn't the rate — it's affordability. With the median U.S. existing-home price around $435,300 (NAR, late 2025) and the 30-year fixed near 6.30%, the monthly P&I on a 20% down purchase is approximately $2,160. Add property tax, insurance, and PMI (where applicable) and the typical PITI runs $2,500–$2,900. By the 28% front-end ratio, that requires roughly $112,000 in household income — well above the U.S. median household income of $80,610. The income-to-affordability gap is the widest it has been in 35 years, with the National Association of Realtors' Housing Affordability Index sitting at 96.2 — meaning the median household earns just 96% of the income needed to qualify for the median home with a 20% down payment.

For homeowners with sub-4% rates locked in 2020–2021 (roughly 62% of all outstanding mortgages per the Federal Reserve), the rate lock-in effect continues to suppress existing-home inventory. New listings remain ~30% below the 2017–2019 average. This affects buyers indirectly: fewer choices, more competition for what does come to market, and prices that haven't softened as much as some forecasters predicted. Expect a slow, asymmetric thaw — when rates eventually fall toward 5%, locked-in homeowners will list, and the resulting supply increase should moderate price growth without triggering a 2008-style collapse.

On the loan-product side, FHA loans continue to dominate the low-down-payment segment with about 20% of total origination volume, VA loans add another 10%, and USDA holds roughly 1–2%. Conventional 5–10% down with PMI has gained share against FHA as PMI premiums have stayed stable while FHA's MIP requirements remain locked in for the life of the loan. The 15-year fixed has seen renewed interest as borrowers prioritize total interest savings over monthly payment optimization — particularly among 50+ buyers planning to retire debt-free. Adjustable-rate mortgages remain a small fraction (under 8%) of new originations, well below their 2007 peak.

What this means for you: the right calculator is the one that matches your actual situation. Buyers in tight affordability brackets benefit most from running multiple scenarios — different down payment percentages, loan terms, and product types — to find the combination that works. Existing homeowners should focus on whether the math justifies refinancing (typically a 0.75%+ rate drop and 2+ years remaining) or whether extra principal payments deliver more value than competing uses for that cash.

The monthly payment formula. The standard amortizing mortgage payment is computed as 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 total number of payments (years × 12). For a $320,000 loan at 6.30% over 30 years, that's $1,981/month in principal and interest. Property tax, homeowners insurance, and PMI are added separately on top.

The 28/36 rule. Your housing payment (PITI) shouldn't exceed 28% of gross monthly income. Total debt payments (housing plus all other monthly debt) shouldn't exceed 36%. Lenders may approve up to 43% in some cases, but the 28/36 thresholds keep you in safer territory. On a $100,000 income, that's $2,333 max for housing and $3,000 max for total debt.

The 1% rule for refinancing. The traditional rule of thumb is to refinance when current rates are at least 1 percentage point below your existing rate. With closing costs typically 2–5% of the loan amount, this gives you a reasonable break-even period. The more precise calculation: closing costs ÷ monthly savings = months to recoup. If you'll stay in the home longer than that, the refinance pays off.

Total interest as percentage of principal. A useful sanity check on any mortgage scenario: divide total lifetime interest by the loan amount. A 30-year mortgage at 6.30% produces roughly 122% — meaning you'll pay $1.22 in interest for every $1 of principal. A 15-year mortgage at 5.65% produces about 49%. The shorter term plus lower rate roughly cuts lifetime interest by 60%.

The PMI math. Private mortgage insurance on conventional loans typically runs 0.46% to 1.50% of the loan amount annually, divided into 12 monthly payments. On a $320,000 loan at the midpoint (1%), that's $267/month in PMI on top of P&I — and it goes away automatically when your loan balance drops to 78% of the original home value (or sooner upon request at 80% LTV with good payment history).

Down payment vs interest rate trade. Putting down 20% rather than 10% on a $400K home saves $40,000 of borrowed principal, eliminates PMI (saving ~$3,200/year on this loan size), and typically gets you a lower rate. The lifetime cost difference: roughly $97,000 over 30 years. But that requires having an extra $40,000 in cash without depleting your emergency fund — for many buyers, the lower-down-payment route plus aggressive PMI removal at 78% LTV is more practical.