Parameters and Formulas

Open with the fx button, Ctrl+K "Parameters", or the browser's Parameters section. Each parameter has a name, a formula, a kind (length, angle, count…) and an optional comment. Its value shows next to it, and errors appear immediately.

Any field in the app accepts a formula, for example:

width / 2 + 3 mm
2 * pi * r
atan(rise / run)
hole / 2
-(depth / 2 - inset)
30°

Supported	Details
Operators	+ - * / ^, parentheses, unary minus
Units	mm, cm, m, in, ft, " (inches), deg, °, rad
Functions	sin cos tan asin acos atan atan2 sqrt abs round floor ceil min max
Constants	pi, tau
Unit checking	Adding a length to an angle is an error, with a clear message
Bare numbers	Use the field's unit (the design unit for lengths, degrees for angles)
Safety	Names are validated, and circular references are detected and reported

Changing a parameter rebuilds everything that uses it.