Every Tool, One Place

Most buyers shop by home price, but lenders approve by monthly payment and debt-to-income ratio. A $500,000 house with 10% down at one rate can cost less per month than a $470,000 house with 5% down at a higher rate once mortgage insurance, tax, and insurance are added. That is why LoanPay Logic puts the mortgage calculator at the center of the site: enter price, down payment, rate, and term, and you see principal, interest, tax, insurance, and HOA as one housing number you can actually budget around.

The conventional starting point is 20% down. At 20% equity most conventional lenders stop charging private mortgage insurance (PMI), which directly lowers the monthly payment without changing the rate. Smaller down payments keep buying within reach sooner, but PMI stays until you reach 20% equity by payments or appreciation, with automatic termination near 22% for qualifying loans. FHA loans follow a different rulebook with upfront and annual mortgage insurance premiums (MIP) under HUD guidelines — often for the life of the loan on small down payments. Before you fall in love with a payment estimate, check which insurance regime applies to your loan type.

Closing costs are the second surprise. Across the U.S. they typically run 2%–5% of the loan amount — lender origination, appraisal, title, prepaid escrow, and state recording charges — per Consumer Financial Protection Bureau (CFPB) and HUD home-buying guides. On a $400,000 loan that is roughly $8,000–$20,000 in cash to close on top of the down payment. Discount points let you trade upfront cash for a lower rate; lender credits do the reverse. Always compare offers with the official Loan Estimate form rather than headline rate alone.

How to use this site in 15 minutes

First, estimate the payment on the core mortgage calculator with realistic local tax and insurance — not the demo defaults. Second, open the comparison calculator and run 15-year versus 30-year terms, or two different rates, to see the lifetime-interest gap. Third, test payoff speed with the biweekly calculator: one extra principal payment per year can remove years from a 30-year schedule. Fourth, if you already own, model a lump-sum principal reduction in the recast calculator before paying for a full refinance. Each tool runs entirely in your browser — no sign-up, no uploaded figures.

Lenders size loans with debt-to-income math. Housing cost near 28% of gross monthly income is a comfortable planning target, with total debt — housing plus car, student, and card minimums — at or below 43% for Qualified Mortgages under CFPB Ability-to-Repay guidance. If your estimate pushes housing above 30% of gross pay, shrink the price band, raise the down payment, or extend the term before talking to a lender. For adjustable-rate scenarios, continue to the ARM calculator; for the buy-or-rent question, use the rent vs buy analyzer. Rate bands on this site are illustrative for comparison only — confirm your actual rate, points, and APR with a licensed lender and the official disclosures.

Beyond mortgages, the library covers retirement (FIRE number, ISA/SIPP), Amazon FBA margins, shipping weight, time zones, GPA, writing tools, and health estimators — over 250 free tools under one search. Mortgage content is written by Sarah Mitchell, Senior Mortgage Content Writer, and reviewed by James Carter, CPA, Financial Reviewer. Published 2024-06-15; last reviewed 2026-09-28. Calculations are estimates for planning, not quotes or advice — see our disclaimer, about page, and contact page.