How It Works
Our calculator uses the same underwriting formulas that banks and lenders apply when reviewing mortgage applications. All calculations are based on standard amortization math, current Fannie Mae/Freddie Mac guidelines, and real market data from NAR, CFPB, and Freddie Mac.
Results are for educational purposes. Always consult a licensed mortgage professional before making financial decisions.
Frequently Asked Questions
Is this calculator free?
Yes — completely free. No sign-up, no email required, no hidden fees.
How accurate are the results?
Results use standard amortization formulas and national average assumptions for taxes, insurance, and PMI. Your actual costs will vary based on location, lender, and credit profile. Use these as a starting point, not a final answer.
What data sources do you use?
Rate data from Freddie Mac PMMS. Tax averages from US Census Bureau. PMI estimates from Urban Institute. Lending criteria from Fannie Mae and FHA guidelines.
Buying from abroad? International buyers (Singapore, UAE, Turkey, Canada) face additional overlay layers. Some lenders require 30% down for foreign nationals. Ask Zai which lenders accept international profiles —
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The part no calculator can tell you
Numbers like these tell you what you can afford. They cannot tell you whether a lender will say yes — and that varies more than almost anyone realises. In the complete 2025 federal record, approval rates across the 100 largest FHA lenders ran from 98.2% down to 21.3%. Same program, same year.
And it is not simply who applies where: holding state, loan amount, income, debt-to-income and loan-to-value constant, applicant mix explains only a 2.7× range in expected outcomes.
CFPB HMDA 2025, computed by FinanceRateCalc · rates reflect applicant mix as well as lender practice · historical observation, not a prediction · free, CC BY 4.0.
The Denial Dispatch
One finding a week from the federal mortgage record.
One chart, three paragraphs, every Saturday. Measured, not assumed.
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