The short answer most articles give you is "between 150 and 160 characters." That answer is wrong, or at least incomplete, because Google doesn't measure meta descriptions in characters — it measures them in pixels. And since pixels-per-character vary by font, your usable budget changes depending on which words you pick.
This post is the long answer: the real cutoff, the rewriting problem, and how to write a description that actually shows up in the SERP.
The real cutoff: pixels, not characters
Google's desktop SERP truncates meta descriptions at roughly 920 pixels of width in the description font. On mobile it's tighter, around 680-720 pixels, varying by device.
A character isn't a fixed-width unit. The letter i is about 4px wide; W is closer to 13px. So a 155-character description full of narrow letters can fit comfortably, while a 140-character description full of wide letters and capitals gets truncated with an ellipsis.
In practice:
- 130 characters is a safe-everywhere number that almost never truncates on mobile or desktop.
- 155-160 characters is the desktop limit if your text uses average letter widths.
- Beyond 160 is a risk on desktop and a guarantee of truncation on mobile.
If you want to be exact, our snippet preview tool measures the actual pixel width of your title and description in real time. Toggle between desktop and mobile to see where the cut-off lands for your specific copy.
Why Google rewrites your description ~70% of the time
Here's the bigger problem most "X characters or less" articles ignore: Google rewrites your meta description on the majority of SERPs. Studies from Ahrefs and Portent put the rewrite rate at 60-70% across diverse keyword sets.
Why? Google increasingly believes the meta description should match the user's specific query, not the marketer's pre-written elevator pitch. When the query and your description don't align, Google pulls a passage from your page body that does — and serves that as the snippet instead.
This means three things:
- Writing a perfect 155-character description is no guarantee Google uses it. Your effort can be invisible.
- Writing one anyway is still worth it — Google does use yours about 30% of the time, and that's usually for the most commercially valuable, intent-clear queries.
- Your page body needs to read like a snippet too. If Google rewrites, it'll pull from your actual content. Make sure the first paragraph of your article answers the most likely query in clear, citable English.
What makes a meta description survive (i.e. not get rewritten)
Patterns that correlate with Google keeping your description:
- The query keyword appears verbatim in the description (so Google can bold it).
- It reads as a direct answer to a likely query, not as marketing copy.
- It's specific — "the best running shoes for marathon training" outperforms "great running shoes you'll love."
- It includes a benefit + a small dose of friction-removal ("free, no signup," "in under 60 seconds," "with examples").
Patterns that get rewritten:
- Vague brand boilerplate ("Welcome to Acme, where we help you succeed").
- Stuffed keywords with no narrative ("running shoes, marathon shoes, road shoes, trail shoes...").
- Misalignment between the title's promise and the description's content.
A pre-publish checklist
Before you publish a page, run the description through this checklist:
- Length. Under 130 characters for safety, under 160 for ambition. Use our snippet preview to check pixel width — it's the only number Google actually uses.
- Target keyword. Place it once near the start, naturally.
- Direct answer. Read it as if you were the user. Does it answer the query, or just describe the brand?
- Specificity. Is there at least one concrete fact (a number, a result, a list count) that distinguishes you from competitors?
- CTA. A small, low-friction call to action — "compare," "see examples," "get the checklist" — usually beats "buy now" for top-of-funnel pages.
A worked example
Bad description for a blog post about meta descriptions:
Welcome to our blog, where we discuss everything about SEO and meta tags. Read on to learn more about how to write great meta descriptions for your website.
It's vague brand boilerplate. Google will rewrite it. It also wastes 162 characters not saying anything specific.
Better:
Google measures meta descriptions in pixels, not characters. Here's the real 920px cutoff, why ~70% get rewritten anyway, and how to write one that survives.
Same length, but it answers a likely query verbatim, includes a concrete number (920px), names the rewriting problem the user is probably also wondering about, and frames a benefit. This is the description we shipped on this very post — see for yourself in the SERP when this article lands.
Tools to help
- Snippet Optimizer — pixel-accurate preview of your title and description as Google would render them, with mobile and dark-mode variants.
- AI Snippet Writer — generates multiple optimised description variants from a target keyword. Useful when you've stared at your own page for too long and need fresh angles.
- Schema Generator — adds Article and FAQPage JSON-LD so Google has more context for the SERP, which sometimes (but not always) reduces description rewriting on rich-result pages.
The 155-character rule is a useful first approximation. The pixel cutoff is the truth. The rewriting reality is the bigger story.