Year (a)
The year is exactly 365.25 days (31,557,600 seconds) — twelve equal average months.
Years annualize scientific data, convert light-year distances, and anchor decade, century, and millennium scales.
Year to Day
Convert year to day instantly. Type in either field — results update live.
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Time Year Day
1 year = 365.25 days
Unit
Unit
Conversion table
Selected a values converted to d using the exact factor from this tool.
| a | d |
|---|---|
| 0.01 | 3.6525 |
| 0.1 | 36.525 |
| 1 | 365.25 |
| 2 | 730.5 |
| 3 | 1,095.75 |
| 5 | 1,826.25 |
| 10 | 3,652.5 |
| 20 | 7,305 |
| 50 | 18,262.5 |
| 100 | 36,525 |
| 1,000 | 365,250 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 a = 365.25 d
1 d = 0.0027378508 a
To convert year to day, multiply by 365.25.
To convert day to year, multiply by 0.0027378508.
Example: convert 10 a to d
10 × 365.25 = 3652.5 d
About these units
Short background on the units used in this conversion.
Day (d)
A civil day is exactly 86,400 seconds — 24 hours from midnight to midnight.
Days track weather forecasts, medication schedules, and project deadlines.
Frequently asked questions
How many days are in one year?
One year equals 365.25 days. Multiply your years value by 365.25 to convert to days.
What is the conversion formula?
d = a × 365.25The reverse is
a = d × 0.0027378508, using the same exact factors as this converter.Is this Year to Day converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.
All year conversions
Jump to any time conversion starting from year — including the reverse direction and every other unit in our dataset.
day (d) → year (a)
year (a) → second (s)year (a) → millisecond (ms)year (a) → microsecond (µs)year (a) → nanosecond (ns)year (a) → picosecond (ps)year (a) → femtosecond (fs)year (a) → attosecond (as)year (a) → minute (min)year (a) → hour (h)year (a) → week (wk)year (a) → month (average) (mo)year (a) → year (common, 365 days) (a)year (a) → year (leap, 366 days) (a)year (a) → year (tropical) (a)year (a) → year (sidereal) (a)year (a) → month (synodic) (mo)year (a) → day (sidereal) (d*)year (a) → hour (sidereal) (h*)year (a) → minute (sidereal) (min*)year (a) → second (sidereal) (s*)year (a) → decade (dec)year (a) → century (c)year (a) → millennium (mil)year (a) → fortnight (fn)year (a) → shakeyear (a) → septennial (sept)year (a) → octennial (oct)year (a) → novennial (nov)year (a) → quindecennial (quind)year (a) → quinquennial (quin)year (a) → planck time (tP)