Mortgage Calculator with PMI & Taxes — NerdWallet Compared
NerdWallet’s mortgage calculator provides a basic monthly payment estimate and is surrounded by lender advertisements and lead-capture forms. FreeToolsToGo’s mortgage calculator includes full PITI (Principal, Interest, Taxes, Insurance, PMI, HOA), a month-by-month amortization schedule, extra payment modeling, and CSV export — with no ads and no lead forms.
Side-by-side comparison
| Feature | NerdWallet Mortgage Calculator | FreeToolsToGo |
|---|---|---|
| Price | Free | Free, forever |
| Signup required | ✗ | ✗ |
| Files uploaded to server | ✗ | ✗ |
| Runs in your browser | ✓ | ✓ |
What FT2G tools replace NerdWallet Mortgage Calculator?
Replaces: Mortgage payment and amortization calculation
Full PITI with PMI tracking, amortization schedule, CSV export — no ads, no upsells
Replaces: General loan payment calculation
Auto, personal, student, and home equity loan types with amortization schedule
When NerdWallet Mortgage Calculator might still be the right choice
If you are actively rate-shopping, NerdWallet pairs its calculator with live lender rate tables, personalized quote matching, and editorial lender reviews — none of which a standalone calculator provides. It is also a better starting point for researching loan types and first-time buyer programs. Use NerdWallet for lender research; use this tool when you want the full payment math without the lead forms.
Why this tool exists
Most mortgage calculators on lender or comparison sites exist to capture leads — your monthly payment estimate is the bait, and the rate quote form is the hook. That model breaks down the moment you want to compare 6.50% vs 6.75% at a specific home price, or model the effect of biweekly extra principal payments, because the calculator deliberately hides amortization detail to keep you on the page longer. This tool exists because the math behind a mortgage is simple, well-published, and completely amenable to running in your browser: the monthly payment formula has been in the Consumer Financial Protection Bureau's consumer-disclosure guidance since 2011, and the IRS publishes the deductibility rules in Publication 936 each year. There is no analytics value in concealing those formulas. Your home price, down payment, and credit profile do not need to be shared with any server to compute a payment schedule.
How it works under the hood
The fixed-rate amortization formula M = P × [r(1+r)^n] / [(1+r)^n − 1] (where P = principal, r = monthly interest rate, n = number of payments) is published in CFPB Bureau Bulletin 2011-01 and reproduced verbatim in 12 CFR 1024 Appendix MS-1. Our implementation computes M to full floating-point precision, then walks the schedule month-by-month: each row's interest charge = previous balance × r, principal applied = M − interest, new balance = previous − principal. The schedule is drift-free because the inner loop never rounds the running balance — only the displayed cents per row are rounded.
PITI (Principal + Interest + Taxes + Insurance) extends the formula with three additional monthly accruals: property tax (annual rate × home value / 12), homeowner's insurance (annual premium / 12), and private mortgage insurance (PMI, charged when LTV > 80% at origination). PMI is dropped automatically in the schedule once cumulative principal paid plus the original down payment crosses the 20% equity threshold — the same trigger required by the Homeowners Protection Act of 1998 (HPA, 12 USC §4901–4910). HOA dues are passed through unchanged. Extra principal payments are subtracted from the balance after the interest accrual but before the next-month rate is applied, mimicking how lenders post payments under the Truth-in-Lending Act crediting rules.
Frequently Asked Questions
How is this different from the NerdWallet mortgage calculator?+
Three things: (1) we show the full month-by-month amortization schedule, not just the headline payment; (2) we include PMI, HOA, and extra-payment modeling that NerdWallet's embedded calculator skips; (3) we never show you a lender ad or capture your email. The underlying formula is the same — it's the CFPB-published formula and there is no proprietary math involved.
Does this include PMI?+
Yes. If your down payment is less than 20%, the calculator adds Private Mortgage Insurance to the monthly payment based on your loan-to-value ratio and credit-tier-typical PMI rates. The amortization schedule shows the exact month PMI drops off automatically (the month your principal balance crosses 78% of original home value, per the Homeowners Protection Act of 1998 trigger).
Can I model biweekly or extra principal payments?+
Yes. The "extra payment" input applies additional principal to each scheduled monthly payment. To simulate a true biweekly schedule (26 half-payments = 13 monthly payments per year, effectively 1 extra payment per year), set extra principal to about 1/12 of the regular payment. The schedule recalculates the payoff date and total interest saved.
Is the property tax estimate accurate?+
You enter your local effective property tax rate as a percentage of home value (typically 0.5%-3% depending on state and locality). The calculator applies that rate to the home value, not the assessed value — assessed values are usually 80-100% of market depending on jurisdiction. For an exact escrow estimate, ask your lender for their tax assumption; for a rough monthly payment, the home-value approximation is within a few percent.
Why does the total interest figure look so high?+
On a 30-year mortgage at typical rates, total interest paid often exceeds the principal borrowed — that is mathematically correct and is what the amortization formula produces. The early years are interest-heavy; the schedule visibly shifts toward principal payoff after roughly month 180 on a 30-year loan. The headline number sometimes shocks new buyers; the schedule shows where it comes from month by month.
Does this work for refinances or just new purchases?+
It calculates the payment and amortization for any fixed-rate loan. To compare a refinance, run two scenarios (current loan with remaining term, new loan with new rate and new term) and compare total interest. For a deeper refinance break-even analysis including closing costs, see the dedicated Refinance Calculator linked below.
How do I know the calculation is correct?+
The formula is in the CFPB regulations and reproduced in dozens of textbooks. Independent verification: plug your numbers into NerdWallet, Bankrate, or a bank's calculator — the headline payment should match to the cent. If it doesn't, check that you set the same rate, term, and down payment in both tools. The unit tests for this calculator include hand-traced expected values from the CFPB guidance.
Do I need to share my address, credit score, or income?+
No. Enter your home price, down payment, rate, and term. That is all the math needs. Lender-site calculators ask for your income and credit because they are routing you to a rate quote pipeline; the actual math does not require either input.