# Week number extension

> Do you find people who just have to use week numbers annoying? Week number extension is your tool for understanding their language.

Canonical page: [https://chrome-stats.com/d/week-number-extension](https://chrome-stats.com/d/week-number-extension)

## Overview

- **ID:** `week-number-extension`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Simen Eilevstjønn
- **Category:** other
- **Daily users:** 61
- **Rating:** 5.00 / 5 (3 ratings)
- **Version:** 1.3.1
- **Last updated:** 2021-01-04
- **First published:** 2020-02-04
- **Size:** 95 KB
- **Data as of:** 2026-09-12
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/week-number-extension/)

## Description

The Week Number Extension is a handy Chrome tool designed to help you quickly get the current ISO week number at a glance. If you ever find people using week numbers confusing or need to convert between week numbers and actual calendar dates, this extension is your perfect companion. It provides instant conversion from week number and year to dates and also allows reverse lookup from dates to week numbers.

Ideal for professionals, planners, or anyone working with week-based schedules, the extension simplifies understanding the ISO week system, making communication clearer and scheduling easier. By integrating seamlessly into your Chrome browser, Week Number Extension enhances productivity by removing ambiguity from week-related references.

## Rankings

- #14,813 — Overall
- #2 — week
- #17 — number
- #207 — extension
- #220 — extension guard

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- This permission has no access or impact on the user's system or data, thus carrying no risk.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/week-number-extension)