How many weeks are there in a Year?

One calendar year has 365 days, which are divided into 7-day weeks. To know how many weeks there are in a year, you just divide the number of days there are in a year (365) by how many days there are in a week (7). 

The result will be the average number of weeks there are in a year, which is approximately 52.143, or 52 weeks plus 1 day

Every four years there is a leap year, which has 366 days. By the same calculations, we can understand that in leap years there are 52 weeks and 2 days.

If we want to get even more specific, we can say that:

  • 1 year = 52 weeks and weekends
  • 1 year = 12 months
  • 1 year = 0.1 decades
  • 1 year = 8.760 hours
  • 1 year = 525.600 minutes

The year 2021 in Numbers

During 2021 we will be able to enjoy:

  • 52 weekends
  • 52 Saturdays
  • 52 Sundays
  • 10 federal holidays *
  • 261 working days

*A federal holiday in the United States is a day that is recognized by the federal U.S. Government as a holiday. These are designated by the United States Congress in Title V of the United States Code (5 U.S.C. § 6103). This year's federal holidays fall on January 1st, January 18, February 15, May 31st, July 4th, September 6, October 11, November 11, November 25, and December 25.

The year 2021 in weeks

  • Week 00: December 28, 2020 to January 3rd, 2021
  • Week 01: January 4, 2021 to January 10, 2021
  • Week 02: January 11, 2021 to January 17, 2021
  • Week 03: January 18, 2021 to January 24, 2021
  • Week 04: January 25, 2021 to January 31, 2021
  • Week 05: February 1st, 2021 to February 7, 2021
  • Week 06: February 8, 2021 to February 14, 2021
  • Week 07: February 15, 2021 to February 21, 2021
  • Week 08: February 22, 2021 to February 28, 2021
  • Week 09: March 1st, 2021 to March 7, 2021
  • Week 10: March 8, 2021 to March 14, 2021
  • Week 11: March 15, 2021 to March 21, 2021
  • Week 12: March 22, 2021 to March 28, 2021
  • Week 13: March 29, 2021 to April 4, 2021
  • Week 14: April 5, 2021 to April 11, 2021
  • Week 15: April 12, 2021 to April 18, 2021
  • Week 16: April 19, 2021 to April 25, 2021
  • Week 17: April 26, 2021 to May 2nd, 2021
  • Week 18: May 3rd, 2021 to May 9, 2021
  • Week 19: May 10, 2021 to May 16, 2021
  • Week 20: May 17, 2021 to May 23, 2021
  • Week 21: May 24, 2021 to May 30, 2021
  • Week 22: May 31, 2021 to June 6, 2021
  • Week 23: June 7, 2021 to June 13, 2021
  • Week 24: June 14, 2021 to June 20, 2021
  • Week 25: June 21, 2021 to June 27, 2021
  • Week 26: June 28, 2021 to July 4th, 2021
  • Week 27: July 5, 2021 to July 11, 2021
  • Week 28: July 12, 2021 to July 18, 2021
  • Week 29: July 19, 2021 to July 25, 2021
  • Week 30: July 26, 2021 to August 1st, 2021
  • Week 31: August 2nd, 2021 to August 8, 2021
  • Week 32: August 9, 2021 to August 15, 2021
  • Week 33: August 16, 2021 to August 22, 2021
  • Week 34: August 23, 2021 to August 29, 2021
  • Week 35: August 30, 2021 to September 5, 2021
  • Week 36: September 6, 2021 to September 12, 2021
  • Week 37: September 13, 2021 to September 19, 2021
  • Week 38: September 20, 2021 to September 26, 2021
  • Week 39: September 27, 2021 to October 3rd, 2021
  • Week 40: October 4th, 2021 to October 10, 2021
  • Week 41: October 11, 2021 to October 17, 2021
  • Week 42: October 18, 2021 to October 24, 2021
  • Week 43: October 25, 2021 to October 31, 2021
  • Week 44: November 1st, 2021 to November 7, 2021
  • Week 45: November 8, 2021 to November 14, 2021
  • Week 46: November 15, 2021 to November 21, 2021
  • Week 47: November 22, 2021 to November 28, 2021
  • Week 48: November 29, 2021 to December 5, 2021
  • Week 49: December 6, 2021 to December 12, 2021
  • Week 50: December 13, 2021 to December 19, 2021
  • Week 51: December 20, 2021 to December 26, 2021
  • Week 52: December 27, 2021 to January 2nd, 2022

Some Fun Facts about Weeks

  • A week has 7 days because the Gregorian calendar follows the phases of the moon. Although the Moon takes 29.5 days to cycle through its phases, this is a hard number to base a time span on. It was the Babylons that rounded this cycle down to 28 days and divided into period units of 4, with 7 days each. This is why there are 4 weeks in a month.
  • In the English language, Saturday, Sunday and Monday are named after three of the planets considered to be gods - Saturn, Sun and Moon - while the other days are named after Germanic or Norse gods.
  • Although the international standard defines that the week starts on a Monday, in the United States the norm is still to count Sunday as the first day of the week.