years to days
This converter makes instant conversions from years to days as time duration. To use the converter, please provide a value in the input field. The converter will begin making conversions as the values are being typed in. To add or subtract time from a date, please use our date calculator. To add, subtract, multiply, and divide time, please use our time calculator. To calculate the time between two dates, please use our days calculator.
Year and day are both units of time. In everyday life, a year or day normally refers to a calendar year or calendar day, which are the approximations of the time taken for the Earth to orbit around the Sun and to rotate about its own axis, respectively. The most widely used calendar system in the world today is the Gregorian calendar. It was first introduced in October 1852 by Pope Gregory XIII to replace the Julian calendar.
How many days in a year?
A calendar year in the Gregorian calendar, or modern calendar, consists of 365 days in a common year or 366 days in a leap year. It has a complete leap cycle of 400 years, where every 4th year is a leap year except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400. Within the 400 years cycle, there are 97 leap years. Therefore, on average, there are 
= 365.2425 days in a calendar year.
How to convert years to days
Based on the definition of 365.2425 days in a calendar year on average, the year to day conversion formula is:
day = 365.2425 × year
Thus, to convert from years to days, multiply a value in years by 365.2425. For example, convert 2.4 years to days:
2.4 yr = 2.4 × 365.2425 d = 876.582 d