About Deal Math
Deal Math is a free set of real estate investing calculators and Texas and Oklahoma investor guides, published by Sam Barth at realestate.samcbarth.com as part of the samcbarth.com network of sites.
What is on the site?
- Calculators for cash flow, cap rate, rental yield, mortgage payments, fix-and-flip profit, BRRRR, the 70% rule, wholesale fees and Texas and Oklahoma property tax. Every calculator shows its formula and a worked example built from the same code that runs the calculator.
- Guides to tax sales, foreclosures, probate property and sheriff sales in Texas and Oklahoma.
- County pages for the largest counties in both states.
- News: short summaries of housing and rate data that affect investors.
How is the content researched?
Legal and procedural facts come from the statutes themselves (the Texas Legislature's statutes site, the Oklahoma Statutes) and from official agency and county websites. Each guide and county page lists its sources and the date they were last checked. County pages include only facts we could confirm from official sources; they never list auction dates or properties, because those change every month.
News stories summarize a primary source, such as a Freddie Mac, Census Bureau or Federal Reserve release, and link to it. We do not invent figures, quotes or events. If you spot an error, please tell us and we will correct it.
Is this legal or financial advice?
No. Deal Math is educational. Laws and county procedures change, and every deal is different. Before you bid, buy or sign, confirm the details with the official source and with a licensed attorney, CPA, lender or real estate professional.
How is the site funded?
The site may show advertising, including Google ads. Ads never change the calculators' math or what the guides say. See the privacy policy for how ads and analytics use cookies.