What Week Is It?
Find out the current week number, or look up the week for any date. It's that simple.
What Week Is It?
38
September 15, 2025 - September 21, 2025
14 weeks left in 2025
Understanding Week Numbers
This tool helps you figure out the week number of the year. We use the ISO 8601 standard, which is a fancy way of saying that weeks start on a Monday and the first week of the year is the one with the first Thursday. It's the most common way to do it, and it keeps things consistent.
Frequently Asked Questions