Internal Link Depth & PageRank Flow Modeller
Interactive calculator to model internal crawl depth distribution, calculate PageRank decay across click tiers, and estimate crawl budget waste.
Internal Link Depth & PageRank Flow Modeller
SEO Architecture EngineEvaluate your internal crawl depth distribution, calculate PageRank decay across click tiers, and identify crawl budget waste from deep URLs or orphaned pages.
Site Architecture Page Counts
Crawl Architecture & Equity Summary
PageRank Flow & Tier Distribution
Architecture Recommendations
- Resolve 8 orphaned URLs (1.9% of site) by linking them from contextual category hubs or HTML sitemaps.
- Flatten site hierarchy to bring 105 deep URLs (24.4%) to click depth 3 or fewer using breadcrumbs and faceted filters.
- Deep pages suffer from exponential PageRank decay. Boost internal link equity via related content modules and author entity links.
Why Crawl Depth Governs Indexation Frequency
Search engine crawlers allocate finite resources to each domain. Pages located 4 or more clicks from the home page receive exponential reductions in internal link equity and are crawled less frequently. Keeping key content within 3 clicks ensures consistent indexation.
Implementation Code & Script
Calculates exponential PageRank decay per crawl tier based on standard 0.85 damping factor.
export function calculateTierPageRank(depth: number, damping: number = 0.85): number {
return Math.pow(damping, Math.max(0, depth));
}
export function evaluateCrawlBudgetHealth(pagesAtDepth4Plus: number, totalPages: number): number {
if (totalPages === 0) return 0;
return Number(((pagesAtDepth4Plus / totalPages) * 100).toFixed(2));
}How to cite and attribute this tool
MIT LicenceThis resource is free, open and un-gated under the MIT Open Source Licence. You are encouraged to use, integrate and cite it with attribution:
@misc{geraghty_internal_link_depth_modeler,
author = {Geraghty, Gordon},
title = {Internal Link Depth & PageRank Flow Modeller},
year = {2026},
url = {https://gordongeraghty.com/resources/technical-seo/internal-link-depth-modeler},
note = {Head of Performance, Empire Amplify}
}Changelog & Version History
v1.0.0Initial release of link depth and PageRank flow modeller.