Check out the reason behind how to convert 3 weeks to days, and use the free convertor and video for – how many days in 3 weeks?

## 3 weeks is equal to 21 days.

Quick Calculator for 3 weeks to days

## How many days are in 3 weeks?

Nowadays people use International System of Units, which has seconds, minutes, hours to measure time in a day, and makes everything easier. So how many days in three weeks, or how many days in 3 weeks?

A week is equal to 7 days, so if you need to convert 3 weeks into days, that is from a bigger unit (weeks) to smaller unit (days), you should use the big unit with number – 3 weeks, to multiply 7 days, then you will get the correct answer for how long 3 weeks in days is.

## Why are they called weeks?

The term week, also known as the week or worship, is a unit of time created by the ancient Babylonians. It is the basis for today’s working days and rest days, that is seven days.

The day of the week was called the Seven Yao in ancient China. During the Xia, Shang and Zhou periods in China, the Seven Yao was referred to the sun, the moon, and the five planets: Venus, Jupiter, Mercury, Mars, and Saturn, which were the seven major stars and were the important organizational components of astronomical signs at that time. Later, it was used as a unit of time – seven days for a week, so it was called week.

## How Long is days in 3 Weeks – Video

Got a different answer for how many days in 3 weeks? And what’s the advantage of the way you calculate? We’d love to hear your voice.

Leave your comment below, share with a friend and never stop wondering.❤️