Years To Days Conversion


1 yr = 365 d

Want to convert from days to years instead?

Disclaimer: We've spent hundreds of hours building and testing our calculators and conversion tools. However, we cannot be held liable for any damages or losses (monetary or otherwise) arising out of or in connection with their use. Full disclaimer.

How to convert years to days (yr to d)

The formula for converting years to days is: d = yr × 365. To calculate the year value in days first substitute the year value into the preceding formula, and then perform the calculation. If we wanted to calculate 1 year in days we follow these steps:

d = yr × 365

d = 1 × 365

d = 365

In other words, 1 year is equal to 365 days.

Example Conversion

Let's take a look at an example. The step-by-step process to convert 9 years to days is:

  1. Understand the conversion formula: d = yr × 365
  2. Substitute the required value. In this case we substitute 9 for yr so the formula becomes: d = 9 × 365
  3. Calculate the result using the provided values. In our example the result is: 9 × 365 = 3285 d

In summary, 9 years is equal to 3285 days.

Converting days to years

In order to convert the other way around i.e. days to years, you would use the following formula: yr = d ÷ 365. To convert days to years first substitute the day value into the above formula, and then execute the calculation. If we wanted to calculate 1 day in years we follow these steps:

yr = d ÷ 365

yr = 1 ÷ 365

yr = 0.00273972602739726027397260273973

Or in other words, 1 day is equal to 0.00273972602739726027397260273973 years.

Conversion Unit Definitions

What is a Year?

A year is a unit of time measurement that represents the period it takes for the Earth to complete one orbit around the Sun. It is one of the fundamental units of the calendar, used to divide time into larger intervals and mark the passage of seasons and annual events.
To provide an example of a year, let's consider the Gregorian calendar year, which is widely used in many parts of the world. A Gregorian calendar year consists of 365 days, except for leap years that have 366 days. A leap year occurs every four years to account for the extra time it takes for the Earth to complete its orbit around the Sun.
For instance, if we consider the year 2023, it will have 365 days. This means that from January 1st to December 31st of that year, there will be a total of 365 days. However, in a leap year like 2024, an extra day, February 29th, is added, making it 366 days in total.
The concept of a year is deeply rooted in various aspects of human life. It serves as a basis for agricultural cycles, seasonal changes, and cultural celebrations. For example, farmers rely on the timing of a year to plan their planting and harvesting seasons. In many cultures, the start of a new year is marked by special celebrations, such as New Year's Day on January 1st.
Years are also used to measure age and track personal milestones. When we celebrate birthdays, we are essentially marking the completion of another year since our birth. Similarly, anniversaries and other significant events are often commemorated based on the number of years that have passed.
In scientific fields, the concept of a year is crucial for astronomical observations and calculations. Astronomers use years to determine the orbital periods of planets, moons, and other celestial bodies.
It's worth mentioning that different calendars exist worldwide, each with its own way of measuring a year. For instance, the lunar calendar is based on the cycles of the Moon, while the Islamic calendar follows the lunar cycle but has a different number of days per year.
In summary, a year is a unit of time measurement representing the period it takes for the Earth to complete one orbit around the Sun. The example of a Gregorian calendar year, such as 2023, illustrates how years are used to mark the passage of time, divide time into larger intervals, and determine important events and celebrations.

What is a Day?

A day is a unit of time measurement that represents the period of time it takes for the Earth to complete one full rotation on its axis. It is commonly used to divide time into 24-hour intervals and is fundamental to our daily lives and various aspects of scheduling, astronomy, and natural phenomena.
To provide an example of a day, let's consider a typical daily routine. A day typically begins at midnight (12:00 AM) and ends at the next midnight (11:59 PM). It consists of various activities such as waking up, working or attending school, meals, leisure time, and sleeping. These activities are typically planned and organized based on the concept of a 24-hour day.
In terms of astronomical observations, a day can be defined as the time it takes for a specific point on Earth to rotate once and return to the same position relative to the Sun. This rotation period is approximately 24 hours.
Another example is the measurement of a 24-hour time period in different industries and professions. For instance, in healthcare, a doctor might record vital signs and administer medication at specific intervals within a 24-hour day. In the transportation sector, flight schedules and train timetables are typically organized in 24-hour cycles.
Additionally, a day is divided into smaller units such as hours, minutes, and seconds. For example, a day consists of 24 hours, each hour contains 60 minutes, and each minute is composed of 60 seconds.
It's worth noting that the exact duration of a day is not precisely 24 hours due to various factors, including the Earth's axial tilt and its elliptical orbit around the Sun. To account for these variations, we have concepts such as mean solar time and coordinated universal time (UTC) to standardize timekeeping across different regions.
In summary, a day is a unit of time measurement representing the period it takes for the Earth to complete one full rotation on its axis. The examples of daily routines, astronomical observations, and various time-related activities demonstrate how days are used to organize our lives, measure time, and schedule events based on a 24-hour cycle.

Years To Days Conversion Table

Below is a lookup table showing common years to days conversion values.

Year (yr)Day (d)
1 yr365 d
2 yr730 d
3 yr1095 d
4 yr1460 d
5 yr1825 d
6 yr2190 d
7 yr2555 d
8 yr2920 d
9 yr3285 d
10 yr3650 d
11 yr4015 d
12 yr4380 d
13 yr4745 d

Other Common Year Conversions

Below is a table of common conversions from years to other time units.

1 year in nanoseconds31536000000000000 ns
1 year in microseconds31536000000000 µs
1 year in milliseconds31536000000 ms
1 year in seconds31536000 s
1 year in minutes525600 min
1 year in hours8760 hr
1 year in weeks52.1428571428571428571428571429 wk
1 year in months12 mo
1 year in decades0.1 decade
1 year in centuries0.01 c