Years To Decades Conversion - Inch Calculator

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• Years to Decades Converter
• How to Convert Years to Decades
• What Is a Year?
• What Is a Decade?
• Year to Decade Conversion Table

Person Icon By Joe Sexton

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

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Sexton, J. (n.d.). Years to Decades Converter. Inch Calculator. Retrieved February 5, 2026, from https://www.inchcalculator.com/convert/year-to-decade/

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:

decades = years ÷ 10

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.

decades = (5 yr ÷ 10) = 0.5 decades

Years and decades are both units used to measure time. Keep reading to learn more about each unit of measure.

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.

Learn more about years.

What Is a Decade?

The decade is a time period of 10 years.

Learn more about decades.

Year to Decade Conversion Table

Table showing various year measurements converted to decades.

Years	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

More Year & Decade Conversions

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• years to microsecondsChevron Right Icon
• years to nanosecondsChevron Right Icon

Calendar IconConvert to Decades

• centuries to decadesChevron Right Icon
• months to decadesChevron Right Icon
• weeks to decadesChevron Right Icon
• days to decadesChevron Right Icon
• hours to decadesChevron Right Icon
• minutes to decadesChevron Right Icon
• seconds to decadesChevron Right Icon
• milliseconds to decadesChevron Right Icon
• microseconds to decadesChevron Right Icon
• nanoseconds to decadesChevron Right Icon