Week Numbers

Welcome to WeekNumbers.net

Ever seen a calendar that says "Week 42" and wondered what that means? You're in the right place.

What Are Week Numbers?

Week numbers are a system used to number the weeks in a year — typically from Week 1 to Week 52 (and sometimes Week 53). They’re especially common in Europe and international business settings, making scheduling easier across languages and time zones.

The most widely used system is the ISO 8601 week date standard, where:

Why Use Week Numbers?

Week numbers are used globally in a wide range of industries:

What You Can Do on This Site

Chek week numbers for 2025:

See Week Numbers for 2025
Fun Fact

Did you know? Week 1 in ISO format can actually start in the *previous calendar year*! For example, Week 1 of 2025 begins on Monday, December 30, 2024.

Start Exploring
Week Numbers of 2025

List of all the week numbers in 2025. There are total 01 weeks in 2025.

Current Week Number

Current week number is 14 from Mar 31, 2025 to Apr 06, 2025.

Week NumberDate StartDate End
Week 1Dec 30, 2024Jan 05, 2025

List the week numbers of the coming years.