How many days is 3 weeks?

3 weeks = 21 days

It is 21 days, so saying 21 days is fine — rounding is within 0.5%.

And how many weeks is 3 days?

3 days = 0.43 weeks

Formula: days = weeks × 7

1.2 weeks8.4days

1.4 weeks9.8days

1.6 weeks11.2days

1.8 weeks12.6days

2 weeks14days

2.2 weeks15.4days

2.4 weeks16.8days

2.6 weeks18.2days

2.8 weeks19.6days

3 weeks21days

3.2 weeks22.4days

3.4 weeks23.8days

3.6 weeks25.2days

3.8 weeks26.6days

4 weeks28days

4.2 weeks29.4days

4.4 weeks30.8days

4.6 weeks32.2days

4.8 weeks33.6days

5 weeks35days