I often try to add a max-width to a text frame, so you don't end up with wide texts that no one wants to read. So I made a quick little calculator that gives you a max width depending on font size and characters per line. textwidth.v0.build/

Text Width Calculator – v0 by Vercel

Chat with v0. Generate UI with simple text prompts. Copy, paste, ship.

textwidth.v0.build

A good solution for this can be setting it by rem rather than pixels, right? Then it scales according to the font width. Hopefully Figma and Framer will add that to more closely match web development

Even better is ch units. Literally the width of 0 in the current font, 60-72ch usually makes a nice line-length for paragraphs.