Content Decay Calculator
Estimate how much organic traffic your aging content is losing each year, and what a refresh program could win back.
Content decay is the quiet leak in every content program: pages that ranked last year slip a little every month as information ages and competitors update. One post slipping is noise. A whole library slipping is a real traffic and revenue problem. Estimate the size of yours:
Estimated traffic at risk over the next 12 months
4,950–9,900 visits
Based on your inputs, roughly 2,750 of your monthly visits land on content over a year old. Unmaintained, that segment typically declines 15–30% per year. This is an estimate from typical ranges, not a measurement; your exact number lives in your Search Console data.
How the estimate works (the honest math)
The calculator uses two transparent assumptions:
- How much of your traffic rides on older content.The longer you’ve been publishing, the more of your organic traffic lands on posts over a year old: roughly 20% for young blogs, 55% for blogs 1–3 years in, and 75% for mature libraries. (This is also why decay sneaks up on successful blogs: their best asset is their back catalog.)
- How fast unmaintained content declines.The typical planning range from our agency work is a 15–30% decline per year for aging, untouched content, faster in fast-moving niches, slower for genuinely evergreen topics.
Multiply those out against your monthly traffic and you get the 12-month at-risk range. It’s deliberately a range, and deliberately conservative: the point isn’t a fake-precise number, it’s seeing the order of magnitude you’re leaving undefended.
What to do about it
Decay is one of the highest-ROI problems in SEO because the fix builds on pages that already earned authority and links. The playbook: find the decaying pages in Search Console, prioritize by traffic lost and business value, then refresh, consolidate, or prune. We’ve written the manual version up in what is content decay and how to refresh old blog posts.
Or let the platform run it: Perennial’s Content Refresh watches your Search Console data, surfaces the pages that are slipping, rewrites them for freshness and intent, and re-publishes to the same URL, so the back catalog defends itself.
About the calculator
How accurate is the content decay calculator?
It’s an estimate built on typical ranges, not a measurement of your site. Real decay varies by niche, competition, and how often you already update content. Your exact number comes from comparing each page’s Search Console clicks year over year, which is precisely what Perennial’s Content Refresh automates.
What decay rate does the calculator assume?
It assumes traffic to content older than a year declines 15 to 30 percent annually when left unmaintained, applied to the share of your traffic that lands on older posts (which grows with the age of your library). Both assumptions are stated on the page so you can sanity-check them against your own data.
Can refreshing content really recover lost traffic?
Often, yes, because a decayed page already has authority, links, and ranking history. Updating it for accuracy, freshness, and current search intent is usually faster than ranking a brand-new URL. Results vary by page and market; no one can promise a specific recovery.
How do I find which of my pages are decaying?
In Search Console, compare each page’s clicks over the last 3 to 6 months against the same window a year earlier and sort by the biggest declines. Our SEO content audit guide walks through it, or Content Refresh runs the analysis continuously and queues the rewrites.
Stop estimating. Measure it.
Book a demo and we’ll pull your real decay numbers from Search Console, page by page, and show you what a refresh program would target first.