Enter the time in years below to get the value converted to decades.

Do you want to convert decades to years?

How to Convert Years to Decades

To convert a measurement in years to a measurement in decades, divide the time by the following conversion ratio: 10 years/decade.

Since one decade is equal to 10 years, you can use this simple formula to convert:

The time in decades is equal to the time in years divided by 10.

For example, here's how to convert 5 years to decades using the formula above.

What Is a Year?

One year is the time it takes for the Earth to complete its orbit around the Sun. There are 365 days in a year, with the exception of the leap year when there are 366.

We have leap years because the Earth actually takes 365.2425 days to revolve around the sun, but we round to 365 for convenience. However, since we miss a quarter of a day per revolution around the sun, this means that we add an extra day to the year once every 4 years, hence the leap year.

Years can be abbreviated as yr (plural yrs), and are also sometimes abbreviated as y. For example, 1 year can be written as 1 yr or 1 y, and 2 years can be written as 2 yrs.

The decade is a time period of 10 years.

Table showing various year measurements converted to decades.
1 yr 0.1
2 yr 0.2
3 yr 0.3
4 yr 0.4
5 yr 0.5
6 yr 0.6
7 yr 0.7
8 yr 0.8
9 yr 0.9
10 yr 1
11 yr 1.1
12 yr 1.2
13 yr 1.3
14 yr 1.4
15 yr 1.5
16 yr 1.6
17 yr 1.7
18 yr 1.8
19 yr 1.9
20 yr 2
21 yr 2.1
22 yr 2.2
23 yr 2.3
24 yr 2.4
25 yr 2.5
26 yr 2.6
27 yr 2.7
28 yr 2.8
29 yr 2.9
30 yr 3
31 yr 3.1
32 yr 3.2
33 yr 3.3
34 yr 3.4
35 yr 3.5
36 yr 3.6
37 yr 3.7
38 yr 3.8
39 yr 3.9
40 yr 4