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Calculators

The math, computed. Never hallucinated.

The lessons teach you to set up the math and hand it off, because a language model computing a payment or an IRR is a wrong number with a confident face. These calculators are the other half: real, deterministic math in your browser — no AI in the loop — so the number is right and the assumptions are on the table.

Seller-finance termsPayment, balloon payoff, and total interest on a note you carry — the math the seller-carry lesson hands off.Pairs with: Structure the seller-carry terms→Land residual (max offer)Back into the most you can pay for the dirt — the subtraction stack the residual lesson refuses to compute.Pairs with: Back into the max land price→Takedown scheduleEscalated lot/pad takedowns, revenue, and IRR on the land basis — the compound math the takedown lesson won't do inline.Pairs with: Build the lot or pad takedown schedule→Deal margin (flip spread)Offer vs. resale minus your costs — the spread, the margin, and the breakeven resale, computed clean.Pairs with: Value raw land from your comps→
How do we know?

Every calculator on this page is closed-form arithmetic — amortization, subtraction stacks, compounding, IRR by Newton-Raphson — written out on each calculator's page under the same “How do we know?” heading. The math runs deterministically in your browser: plain JavaScript, zero API calls, no AI in the loop. View the page source and check it yourself.

The contrast case: what happened when we asked AI models to compute deal numbers →

Every calculator is a planning estimate from your inputs, computed here, not by an AI. None is a valuation, an appraisal, or tax, legal, or investment advice. Confirm figures with your own model and the right professional before you rely on them.