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Sports & Analytics Medium #elo#rating#analytics

ELO Rating System

Player or team rating updates after each match based on result and rating gap.

A free, animated elo rating system you can read here or embed on any website, from Scrollchart.

ELO Rating System

ELO Rating SystemRating exchange over 20 matches (K=32)AB

Two players exchanging ELO points over a series of matches. The expected-score curve as a function of rating difference is shown alongside, plus how K-factor controls volatility.

Good for

  • Rating-system explainers
  • Cross-sport ELO articles

Source & accuracy

This elo rating system is an editorial illustration built to represent the concept accurately. Where it shows figures, they are typical or representative values chosen to make the relationship clear, not a single underlying dataset. The diagram and its explainer are reviewed and maintained centrally, and updated over time as understanding improves.

Ratings move based on upsets and expectations

In the ELO system, a high-rated player expected to win a match gains few points for victory but loses many for defeat. A low-rated player gains more for a win because the upset was larger. The magnitude of change depends on the pre-game rating gap: beating a much stronger opponent swings more rating points than beating a peer. This self-adjusting mechanism prevents ratings from stalling and keeps them responsive to current form.

From chess to soccer to esports

ELO originated in chess but has spread to soccer rankings, esports, and online gaming platforms. The system requires only match results, no subjective judgment, making it reproducible and transparent. Millions of casual players know their ELO rating, and it drives matchmaking in competitive video games. Organizations like FIDE (chess) and esports leagues publish ELO ratings, making it one of the most widely adopted player-comparison tools.

Embed this diagram

Add this animated elo rating system to your own site. Copy one line of HTML, or use the embed builder for theme and sizing options.

Reference

What this is
A free, embeddable, animated elo rating system for any website.
Who uses it
Sports blogs.
How to embed
Copy one line of HTML. No signup. No watermark. Works in WordPress, Webflow, Ghost, Substack, plain HTML.
File size
iframe embed, ~80 KB gzipped (loads on demand, does not block your page paint).
License
Free forever. Editorial explainer text included; updated centrally over time.
URL
scrollchart.com/diagram/elo-rating-system

Embed format options

Copy the universal HTML snippet, the WordPress shortcode, or an iframe fallback - see the WordPress plugin page for details. Any format keeps the same Core Web Vitals profile and the same explainer text.

Embed snippet 
<div data-scrollchart="elo-rating-system" data-scrollchart-v="1"></div>
<script src="https://scrollchart.com/embed.js" async></script>

By embedding, you acknowledge the diagram and explainer text are served from scrollchart.com and may be updated from time to time to reflect new research or to link to relevant sources within the explainer.

Frequently asked questions

Where can I get a free animated "ELO Rating System" for my website?
Scrollchart provides "ELO Rating System" as a free, embeddable animated diagram you can add to any website with one line of HTML. No signup is required and there is no watermark. The diagram and its explainer text are served from scrollchart.com, so the embed stays current without any maintenance on your end.
How do I embed a elo rating system in WordPress or a static site?
Paste the HTML snippet from the Scrollchart diagram page into your WordPress post (in HTML/code view), your Webflow embed block, or directly into a static HTML file. No plugin is needed. The diagram loads from scrollchart.com and paints in as the reader scrolls.
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