WEEKNUM Google Sheet Formula

Generate Google Sheet WEEKNUM Formulas in seconds

Try Formula Generator View Examples

Interactive Formula Generator

Formula Generator

Create complex Google Sheets formulas with natural language. Simply describe what you want to calculate.

Upgrade to Sheet Alchemy Pro

Get advanced formulas, batch processing, and priority support

Upgrade Now

Input

Result

Your formula will be displayed here:

Your formula will appear here

Describe what you want to calculate and click Generate

Pro Features Available

Sheet Alchemy Pro includes additional advanced features to enhance your formula generation.

Advanced Formulas

Complex array formulas and dynamic ranges

Batch Processing

Generate multiple formulas at once

Unlimited History

Save and organize all your formulas

WEEKNUM Formula Syntax

=WEEKNUM("2023-03-15", 1)

Example Use Case

Calculating the week number within a year for a given date

Understanding the WEEKNUM Formula

The WEEKNUM function in Excel returns the week number (1-54) within a year for a given date. It's a date categorization tool for week-based analysis—like tracking weekly patterns or reporting on a weekly basis.

WEEKNUM("2023-03-15", 1) returns 11, the week number for March 15, 2023 in system 1. It takes a date and optional return_type argument, supporting various week numbering systems (1=Sunday start, 2=Monday start, others for ISO and alternate standards).

Why Use WEEKNUM?

WEEKNUM groups dates by week—think weekly reporting or periodic analysis. Its multiple week-counting systems offer flexibility for different business contexts, enabling sorting, filtering, or calculations based on the week of the year.

Example with Sample Data

Date, [Return Type]	Formula	Result
3/15/2023, 1	=WEEKNUM("3/15/2023", 1)	11 (week 11, system 1)
3/15/2023, 2	=WEEKNUM("3/15/2023", 2)	11 (week 11, system 2)
1/1/2023, 21	=WEEKNUM("1/1/2023", 21)	52 (ISO week system)

WEEKNUM identifies week position: March 15, 2023 is in week 11 of the year. It's a weekly classifier.