# Week Number Calculator

A 'Week Number Calculator' is an online tool that finds the week of the year corresponding to the given date.

## What is a Week Number Calculator?

Cuemath's 'Week Number Calculator' helps you to find the week for the given date within a few seconds.

## How to Use the Week Number Calculator?

Follow the given steps to use the calculator:

**Step 1:**Enter the date in the input box, according to the format.**Step 2:**Click on "**Calculate"**to find the week corresponding to the given date.**Step 3:**Click on**"Reset"**to enter the new value.

## How to Calculate the Week for the Given Date?

The week corresponding to the given date can be calculated with the help of the following three steps.

**Step 1:** Find the number of days in that year, till the given date.

**Step 2:** Note the day of the 1st of January of the given year.

**Step 3: **Calculate the odd day according to the day on which the 1st of January falls.

- If January 1 falls on a Monday, it means there are 6 odd days.
- If January 1 falls on a Tuesday, it means there are 5 odd days.
- If January 1 falls on a Wednesday, it means there are 4 odd days.
- If January 1 falls on a Thursday, it means there are 3 odd days.
- If January 1 falls on a Friday, it means there are 2 odd days.
- If January 1 falls on a Saturday, it means there is 1 odd day.

**Step 4: **Accordingly, subtract the number of odd days from the number of days calculated up to the given date.

**Step 5**: Divide the number of remaining days by 7, to find the week.

Let us understand this with the help of an example.

**Solved Example: **

Find the week which falls on April 15, 2021

**Solution:**

For this, we need to know the number of days from January 1 to April 15, 2021.

Number of days = 31 days of January + 28 days of February + 31 days of March + 15 days of April

= 31 + 28 + 31 + 15

=105 days

The 1st of January 2021 is a Friday and hence, there are 2 odd days.

Number of days = 105 - 2 = 103

Number of weeks = 103 ÷ 7 = 14.7

Therefore, the date 15th of April 2021 corresponds to the 15th week of the year.