Convert Years to Days
Convert Years to Days instantly. 1 Year (yr) equals 365.25 Days (d).
Years to Days conversion table
| Years (yr) | Days (d) |
|---|---|
| 1 yr | 365.25 d |
| 2 yr | 730.5 d |
| 3 yr | 1,095.75 d |
| 5 yr | 1,826.25 d |
| 10 yr | 3,652.5 d |
| 20 yr | 7,305 d |
| 50 yr | 18,262.5 d |
| 100 yr | 36,525 d |
| 500 yr | 182,625 d |
| 1,000 yr | 365,250 d |
1 Year = 365.25 Days · multiply Years by 365.25
About converting Years to Days
Years (yr) and Days (d) are both units of time, so converting between them is a single multiplication: multiply your Years figure by 365.25. Ten Years comes to 3,652.5 Days, and a hundred works out at 36,525 Days.
Rule of thumb: going from Years to Days multiplies, so the figure always grows — one Year is already 365.25 Days. If your answer came out smaller, you have the conversion the wrong way round.
What is a Year?
There is no single year. A Julian year is exactly 365.25 days; a Gregorian calendar year averages 365.2425 days, because its leap rule drops three leap days every four centuries; and the tropical year — the actual round trip of the seasons — is about 365.2422 days. The leap-year rules exist precisely to stop the calendar drifting away from that tropical figure. This converter uses the Julian year of 31,557,600 seconds, the convention astronomers use and the one the light-year is built on, but it is a chosen convention rather than a fact about the Earth.
What is a Day?
A day is exactly 86,400 seconds — and that is a statement about the unit, not about the Earth. A real solar day varies slightly depending on winds, tides and what the planet’s core is doing, and tidal friction is gradually lengthening it. The gap between the tidy unit and the untidy planet is what leap seconds patch over. Astronomers also distinguish the solar day from the sidereal day, one full rotation relative to the stars, which is about four minutes shorter because the Earth has meanwhile moved along its orbit.
To put both in perspective: a year is one lap of the Earth around the Sun, while a day is one turn of the Earth on its axis.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Days to Years converter, or browse all Time converters.
Frequently asked questions
How many Days are in one Year?
There are 365.25 Days in one Year.
How do I convert Years to Days?
Multiply the number of Years by 365.25. For example, 10 Years = 3,652.5 Days.
What is 100 Years in Days?
100 Years is equal to 36,525 Days.
How do I convert Days to Years?
Multiply the Days value by 0.002738 (or divide by 365.25).
Is this Years to Days conversion exact?
The figure is accurate to the precision shown. 1 Year = 365.25 Days is rounded for readability, so for engineering or scientific work carry more decimal places than the table displays.
What is a Year?
There is no single year. A Julian year is exactly 365.25 days; a Gregorian calendar year averages 365.2425 days, because its leap rule drops three leap days every four centuries; and the tropical year — the actual round trip of the seasons — is about 365.2422 days. The leap-year rules exist precisely to stop the calendar drifting away from that tropical figure. This converter uses the Julian year of 31,557,600 seconds, the convention astronomers use and the one the light-year is built on, but it is a chosen convention rather than a fact about the Earth.
What is a Day?
A day is exactly 86,400 seconds — and that is a statement about the unit, not about the Earth. A real solar day varies slightly depending on winds, tides and what the planet’s core is doing, and tidal friction is gradually lengthening it. The gap between the tidy unit and the untidy planet is what leap seconds patch over. Astronomers also distinguish the solar day from the sidereal day, one full rotation relative to the stars, which is about four minutes shorter because the Earth has meanwhile moved along its orbit.