Download of AcadCalc 1.0 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program's installer file is generally known as AcadCalc.exe.
The following versions: 2.0 and 1.0 are the most frequently downloaded ones by the program users. We recommend checking the downloaded files with any free antivirus. AcadCalc lies within Office Tools, more precisely Calculators. The actual developer of the free program is NYacad Inc.
From the developer:
AcadCalc: the program for calculations inside AutoCAD (any formats of numbers). Results of calculations can be used directly for performing AutoCAD commands: move, copy and others.
You may want to check out more software, such as iUnit, Pico Diagnostics or Any Place Calculator, which might be similar to AcadCalc.