About Mortgage Calc Tools

Hi, I'm Richard Scherzinger — the person behind Mortgage Calc Tools. I built this after going through the mortgage process myself and wanting clear answers without a sales pitch attached to every one.

I'm not a CPA or a financial advisor, and nothing here is professional advice. I'm just someone who got tired of calculators hidden behind email forms, so I built free ones that show their work. If a calculator here ever gives you a wrong number, email me and I'll fix it.

Why this site exists

We built Mortgage Calc Tools because buying a home is the biggest financial decision most people will ever make, and the math should not be a mystery. When we were shopping for our first mortgage, we wanted straightforward calculators that showed exactly how different scenarios would play out — without lead-generation forms, email walls, or sales pitches for specific lenders.

Most mortgage calculators online exist to capture your contact information and sell it to loan officers. They hide the full picture, ask for your phone number before showing results, or only show you the monthly payment without explaining the total cost. We believe mortgage math should be transparent, free, and independent.

What we believe

Calculators should show the full picture. Every calculator on this site displays a complete breakdown — monthly payment, total interest, amortization details, and comparison scenarios. We never hide results behind sign-up walls.

Free means free. No accounts, no email gates, no upsells. Our calculators run entirely in your browser — your financial data never touches our servers. We fund the site through advertising.

Honesty about limitations. Mortgage calculators use simplified models. Real mortgage terms include variable closing costs, PMI thresholds, escrow requirements, and lender-specific fees. We state these limitations clearly rather than presenting estimates as guarantees.

Education over products. We do not sell mortgages, recommend specific lenders, or receive referral commissions. Our articles explain concepts; they do not push products.

What we are not

We are not mortgage brokers, real estate agents, or licensed financial advisors. Nothing on this site is mortgage advice or a recommendation to buy, sell, or refinance. Our calculators are mathematical tools that apply standard mortgage formulas to the numbers you enter. They cannot account for your specific credit situation, local market conditions, lender requirements, or financial goals.

If you are making decisions about buying a home, refinancing, or taking on a mortgage — please consult a qualified mortgage professional. Our calculators give you a framework for understanding the numbers, but they are not a substitute for professional guidance.

Our calculators

Mortgage Payment Calculator — calculates your monthly mortgage payment including principal, interest, property taxes, and homeowners insurance for any loan amount and term.

Refinance Calculator — compares your current mortgage to a new loan to determine monthly savings, break-even point, and total interest saved over the remaining term.

Home Affordability Calculator — estimates the maximum home price you can afford based on your income, debts, down payment, and target debt-to-income ratio.

Amortization Schedule Calculator — generates a detailed year-by-year and month-by-month breakdown showing how each payment splits between principal and interest over the life of your loan.

Down Payment Calculator — calculates how long it will take to save your target down payment based on your current savings, monthly contributions, and savings rate.

Rent vs Buy Calculator — compares the true cost of renting versus buying over a specified time horizon, accounting for home appreciation, investment returns, tax benefits, and maintenance costs.

How We Build Our Calculators

Every calculator on this site uses industry-standard financial formulas. Our mortgage payment calculator applies the standard amortization formula: M = P[r(1+r)^n] / [(1+r)^n - 1], where P is the principal, r is the monthly interest rate, and n is the total number of payments. We then add monthly property tax and insurance to give you the full PITI (principal, interest, taxes, insurance) picture.

We test every calculator against known correct values before publishing. For example, we verify that a $280,000 loan at 6.75% over 30 years produces a monthly principal and interest payment of $1,816.36 — matching the output from standard amortization tables and verified financial calculators. When mortgage formulas involve more complex scenarios (like refinance break-even analysis or rent-vs-buy comparisons), we document our assumptions clearly on each calculator page.

All calculations happen locally in your browser using JavaScript. When you enter your home price, income, or other financial details, that data stays on your device. We have no server-side processing, no database of user inputs, and no way to see what you have entered. You can verify this by using our calculators in airplane mode — they work exactly the same.

How the Site Is Funded

Mortgage Calc Tools is funded through advertising via Google AdSense. Ads help us keep the calculators free for everyone. We do not charge for any calculator, sell user data, accept paid product placements, or receive referral commissions from mortgage lenders. The advertising on this site is served by Google and is not influenced by our editorial content. If you see an ad for a specific lender on this site, it is because Google's ad network chose to display it — not because we endorse or recommend that lender.

Our Commitment to Accuracy

Mortgage math matters. A small error in a payment calculation could lead someone to overestimate what they can afford, and the consequences of that mistake play out over decades. That is why we take accuracy seriously. We regularly verify our formulas against published amortization tables, cross-reference our outputs with established financial tools, and clearly state the assumptions and limitations of each calculator.

That said, no online calculator can account for every variable in your specific mortgage situation. Lender fees, discount points, PMI rates, local tax assessments, HOA dues, and dozens of other factors affect your real cost. Always use our calculators as a starting point for understanding the math — then work with a licensed mortgage professional who can provide numbers tailored to your exact situation.

Contact

Found a bug, have a calculator request, or want to report an error in our formulas? We take accuracy reports seriously. Email hello@homecalctools.com and we will investigate promptly.