See your page the way Google's results page will show it

Google truncates by pixel width, not character count. Wide characters like "W" or "M" and capital letters take up more space than narrow ones like "i" or "l" - two 60-character titles can render at very different widths.

It's a close approximation using the pixel widths and fonts most SERP-preview tools reference, not a guarantee - Google's actual rendering varies by device, locale, and ongoing layout changes it doesn't publish in advance.

Mobile search results render in a narrower column, so the same title and description wrap and truncate sooner than they would on a wider desktop results page.

Not directly as a ranking factor, but a compelling description affects click-through rate - and Google frequently rewrites or replaces your description anyway if it thinks a snippet from the page itself answers the query better.