---
title: "Reading time and categories on cards"
description: "How the overview shows an estimated read time and category badges for every post."
date: "2026-07-02"
keywords:
    - reading time
    - categories
    - overview
categories:
    - Reference
author: "Maya Lindholm"
author-image: "/assets/blog/authors/maya-lindholm.svg"
image: "/assets/blog/reading-time-and-categories/hero.en.jpg"
---

## Reading time is precomputed

The `Blog` class estimates a whole-minute reading time from each post's body at parse time, so
the overview can show "N min read" without loading the full article.

## Categories drive the filters

List one or more `categories` in front-matter and the overview turns them into filter buttons -
unless every post shares a single category, in which case the bar is hidden.