NoteTools — Note & Real Estate Calculators
Ten free professional-grade calculators for mortgage note and real estate investors: note yield, partial purchases, discounted pricing, workout ROI, amortization with irregular payments, DSCR, and more.
Open the calculators →Ultimate Note Investor GOLD
Over 35 hours of training from the most experienced note investors on the planet — 48+ streaming videos, the 7-part Beginning Note course, and lifetime access for one price.
See the course →RF Design Toolkit
Free browser-based RF engineering tools: matching network design, cascade analysis, link budgets, LC filter synthesis, PLL phase noise, antennas, and an interactive Smith chart.
Open the toolkit →HP 10B Financial Calculator
A faithful, browser-based HP 10B — time-value-of-money, cash flows, IRR/NPV, and amortization, right in your browser with no install.
Launch the calculator →TVM — Time Value of Money Calculator
A fast, free time-value-of-money calculator: solve for present value, future value, payment, rate, or term on any loan or note.
Open the calculator →Common Power Series
A reference table of common power series: exponential, logarithmic, binomial, trigonometric, hyperbolic, and Bernoulli-number expansions with intervals of convergence.
Open the reference →Matrix Mathematics
A clear, visual guide to matrix mathematics: operations, linear equations, eigenvalues and eigenvectors, and why matrices power modern artificial intelligence.
Open the guide →IRA.RE — Real Estate With Your IRA
Your retirement account can own rental properties, land, and private notes — tax-deferred or tax-free. How self-directed IRAs and Roth IRAs unlock real estate investing.
Visit ira.re →Local Blitz — Digital Marketing
Digital marketing in Indianapolis and San Diego: SEO, AEO, paid media, and growth strategy for local and national businesses.
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