What We Build and How We Work
Mortgage calculators are most useful when their assumptions are visible. Our tools are designed to separate principal and interest from other housing costs, show editable inputs, and make scenario comparisons easy.
The calculators are educational tools, not lender offers or individualized financial advice. We document the formulas and assumptions on our Methodology page and use primary sources where rules or program details matter.
Our Core Promises:
- 🔒 No calculator signup — Core calculators can be used without creating an account.
- ⚡ Browser-side calculation — Core calculation inputs are processed in your browser.
- 📐 Documented methodology — We explain formulas, assumptions, and limitations.
- 📚 Source-based guides — Regulatory and program claims are checked against authoritative sources where available.
Explore 22 Free Tools
The tool set covers mortgage payments, affordability, refinancing, extra payments, debt-to-income, student loans, closing costs, and related planning scenarios.
Mortgage Calculator
Estimate principal and interest, taxes, insurance, mortgage insurance, and view an amortization schedule.
Calculate Now →Lifestyle Affordability
Compare a proposed housing payment with the living expenses and savings targets you enter.
Check Lifestyle →True Cost Revealer
Model maintenance, HOA, closing-cost, and other ownership assumptions alongside the mortgage.
Reveal Costs →Refi Decision Engine
Compare refinance payment savings, costs, and break-even timing using your assumptions.
Analyze Refi →Rate Time Machine
Compare today's buying power against historical interest rates and home prices.
Time Travel →Escrow Impact
Estimate how a property-tax change could affect the escrow portion of a monthly payment.
Check Escrow →