ToolStackIA publishes free mortgage calculators and plain-English guides for people buying, owning or refinancing a home in the United States.
Why we built this site
Mortgage paperwork is full of terms like amortization, escrow, PMI and APR that make a huge difference to what you pay, yet are rarely explained clearly. Our goal is simple: give you accurate tools and straightforward explanations so you can understand the numbers before you talk to a lender.
How we create content
- Numbers are calculated, not guessed. Every example in our guides is computed with standard financial formulas and checked twice.
- We cite primary sources such as the Consumer Financial Protection Bureau (CFPB), Fannie Mae, Freddie Mac and HUD.
- We keep content current and show the date each guide was last updated.
- Our calculators run in your browser. We do not collect what you type.
Who is behind ToolStackIA
ToolStackIA is written and maintained by Fabián E., founder and editor. It is an independent, self-funded project focused on one topic: helping U.S. homebuyers and homeowners understand the numbers behind their mortgage. Each guide is researched from primary sources such as the CFPB, Freddie Mac, Fannie Mae, HUD and FHFA, every example is calculated with standard amortization formulas and checked twice, and guides are reviewed and updated when rules or loan limits change. If you spot an error, please tell us and we will correct it. Fabián is not a licensed loan officer or financial advisor, which is why every guide points you to official sources and recommends confirming decisions with a licensed professional.
Independence
ToolStackIA is independent and supported by advertising. We are not a lender and do not sell loans. Read our Financial Disclaimer to learn more.
Questions or found an error? Contact us; we read every message.