Calculators that get the conventions right
Free to use with no account. Each one states on the page which lender convention it follows, so you can tell whether its answer is the one your credit committee would get. If there is a calculation you keep rebuilding in a spreadsheet, write to support@altyst.ai and it moves up the list.
Loan sizing calculator
Size a commercial mortgage against loan to value, minimum DSCR, and minimum debt yield at the same time, and find out which of the three is holding your proceeds down.
DSCR, debt yield, LTV, the mortgage constant, interest only, and the balloon at maturity.
Open the calculatorMultifamily underwriting model
A working ten-year acquisition model in Excel. Rent roll, T-12 normalization, an eleven-year pro forma, debt sized on three tests, returns, and three two-way sensitivity grids. Yours to edit and pass on.
2,718 live formulas across eleven tabs, nineteen internal checks, no protected sheets and no macros.
Download the modelPut a tool on your own site
Every calculator here is embeddable. One iframe, no account, no key. The framed page loads no advertising script and sets no cookie on your readers. Keep the credit line and it is yours to use, including on a commercial site.
The code, the parameters, and exactly what the frame is allowed to do.
Get the embed codeWhy these are free and ungated
A calculator behind an email form is a lead capture with a calculator attached, and it offers a bad trade: your address in exchange for arithmetic you could do in a spreadsheet. Nothing here asks for an address, and no part of the answer is held back until you sign up.
They are also not toys. The loan sizing calculator is checked case by case against the same deterministic engine that runs inside the product, and the two agree to the cent. Anything published here has to clear that bar before it goes up. Where a convention is ambiguous the page names the one it follows, because a number without its convention is not an answer yet.
What they will not do is underwrite a deal. A calculator takes numbers you already know. The product reads the offering memorandum, the rent roll, and the T-12 to work out what those numbers are, then carries them through debt, leasing, exit, and the Excel workbook.
Past the calculator
Bring the documents and get the whole model instead of one ratio.