MortgageMasher is a free US mortgage calculator built by P. Beal, a financial planning professional with 26 years in banking and financial planning, plus 19 years of direct small business ownership.
Most homebuyers know they need a mortgage calculator, but many free tools on the web are inaccurate or incomplete. They miss PMI, don't account for property taxes, or use simplified formulas that don't reflect real US mortgage rules.
MortgageMasher is built specifically for US mortgages. It handles FNMA guidelines, PMI thresholds, semi-annual compounding, property tax estimation, and full amortization schedules. Whether you're a first-time buyer or a seasoned investor, you get accurate numbers that reflect how your actual mortgage will work.
P. Beal brings 26 years of professional experience in banking and financial planning, combined with 19 years of direct small business ownership. This background informs every calculator and tool on Sharpline Tools—the focus is always on practical, numbers-based decision making rather than generic financial advice.
MortgageMasher is part of the Sharpline Tools network — a suite of free personal finance calculators built to give people fast, accurate, unbiased financial information. All Sharpline tools are free to use, require no account or sign-up, and are supported by advertising.
Sharpline also operates a web design and development service — Sharpline Digital — building custom websites for small businesses in British Columbia and across Canada.
MortgageMasher is an educational planning tool. All results are estimates based on the information you enter and are provided for informational purposes only. Results assume fixed interest rates and do not account for all possible loan variations, fees, or special programs.
MortgageMasher is not a licensed mortgage lender, loan advisor, or financial planning service. Nothing on this website constitutes financial, legal, or mortgage advice. Results should not be used as the sole basis for any financial decision.
For personalised mortgage guidance, please consult a licensed mortgage lender or financial advisor.