## Conversion formula

The conversion factor from days to years is 0.0027397260273973, which means that 1 day is equal to 0.0027397260273973 years:

1 d = 0.0027397260273973 yr

To convert 13 days into years we have to multiply 13 by the conversion factor in order to get the time amount from days to years. We can also form a simple proportion to calculate the result:

1 d → 0.0027397260273973 yr

13 d → T(yr)

Solve the above proportion to obtain the time T in years:

T(yr) = 13 d × 0.0027397260273973 yr

T(yr) = 0.035616438356164 yr

The final result is:

13 d → 0.035616438356164 yr

We conclude that 13 days is equivalent to 0.035616438356164 years:

13 days = 0.035616438356164 years

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 year is equal to 28.076923076923 × 13 days.

Another way is saying that 13 days is equal to 1 ÷ 28.076923076923 years.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that thirteen days is approximately zero point zero three six years:

13 d ≅ 0.036 yr

An alternative is also that one year is approximately twenty-eight point zero seven seven times thirteen days.

## Conversion table

### days to years chart

For quick reference purposes, below is the conversion table you can use to convert from days to years

days (d) years (yr)
14 days 0.038 years
15 days 0.041 years
16 days 0.044 years
17 days 0.047 years
18 days 0.049 years
19 days 0.052 years
20 days 0.055 years
21 days 0.058 years
22 days 0.06 years
23 days 0.063 years