About Keysheet

Keysheet is a free, browser-based practice environment for the Texas Instruments BA II Plus financial calculator. It reproduces the key logic and worksheets — 2ND functions, TVM, cash flow, amortization, bond, depreciation and friends — so CFA, FRM and CFP candidates and business students can drill “which keys do I press” anywhere, without carrying the physical calculator.

Keysheet is not a Texas Instruments product and is not affiliated with or endorsed by Texas Instruments or CFA Institute. “BA II Plus” is a trademark of Texas Instruments. This site cannot be used in proctored exams — only the physical calculators on each exam organizer’s current list are allowed there.

How accuracy is tested

The computation core is a standalone TypeScript module that runs on decimal arithmetic (not binary floating point), and every worked example on this site is locked by unit tests in the repository. TVM, NPV, IRR, amortization and the other worksheets are checked against independently verified reference values before each build.

What it is not

It is not a pixel-perfect emulator of the hardware, an official simulator, or a exam-day device. Web practice builds understanding of the keystrokes; muscle memory still needs the real calculator.