Time converter
Years to Days
Converting Years to Days is a single multiplication when you know the factor. One yr equals 365.25 d, so multiply the value in yr by 365.25. The calculator below works in both directions and accepts decimals.
Formula 1 yr = 365.25 d
Need the other direction? Days to Years.
How to convert Years to Days
A Julian year is 365.25 days (31,557,600 seconds); calendar years vary. A day is 24 hours, or 86,400 seconds, ignoring leap seconds.
To convert Years to Days, multiply the value in yr by 365.25. For example, 10 yr × 365.25 = 3,652.5 d. This works because the ratio between the two units is constant for every value in time.
Worked examples
| yr | d |
|---|---|
| 1 yr | 365.25 d |
| 2.5 yr | 913.125 d |
| 5 yr | 1,826.25 d |
| 10 yr | 3,652.5 d |
| 25 yr | 9,131.25 d |
| 50 yr | 18,262.5 d |
| 100 yr | 36,525 d |
Reverse conversion
| d | yr |
|---|---|
| 1 d | 0.00273785 yr |
| 5 d | 0.01368925 yr |
| 10 d | 0.02737851 yr |
| 25 d | 0.06844627 yr |
| 50 d | 0.13689254 yr |
| 100 d | 0.27378508 yr |
When this conversion is useful
This is the calculation you need when you are planning a project, a sprint or a schedule and need consistent units. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 yr is 365,250 d.
Is the conversion exact?
Seconds, minutes, hours, days and weeks are exact. Months and years here use average Julian values (30.4375 days and 365.25 days), so a calendar conversion can differ slightly.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
yr to d conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Years (yr) | Days (d) |
|---|---|
| 1 yr | 365.25 d |
| 2 yr | 730.5 d |
| 3 yr | 1,095.75 d |
| 4 yr | 1,461 d |
| 5 yr | 1,826.25 d |
| 6 yr | 2,191.5 d |
| 7 yr | 2,556.75 d |
| 8 yr | 2,922 d |
| 9 yr | 3,287.25 d |
| 10 yr | 3,652.5 d |
| 11 yr | 4,017.75 d |
| 12 yr | 4,383 d |
| 13 yr | 4,748.25 d |
| 14 yr | 5,113.5 d |
| 15 yr | 5,478.75 d |
| 16 yr | 5,844 d |
| 17 yr | 6,209.25 d |
| 18 yr | 6,574.5 d |
| 19 yr | 6,939.75 d |
| 20 yr | 7,305 d |
| 21 yr | 7,670.25 d |
| 22 yr | 8,035.5 d |
| 23 yr | 8,400.75 d |
| 24 yr | 8,766 d |
| 25 yr | 9,131.25 d |
| 26 yr | 9,496.5 d |
| 27 yr | 9,861.75 d |
| 28 yr | 10,227 d |
| 29 yr | 10,592.25 d |
| 30 yr | 10,957.5 d |
| 31 yr | 11,322.75 d |
| 32 yr | 11,688 d |
| 33 yr | 12,053.25 d |
| 34 yr | 12,418.5 d |
| 35 yr | 12,783.75 d |
| 36 yr | 13,149 d |
| 37 yr | 13,514.25 d |
| 38 yr | 13,879.5 d |
| 39 yr | 14,244.75 d |
| 40 yr | 14,610 d |
| 41 yr | 14,975.25 d |
| 42 yr | 15,340.5 d |
| 43 yr | 15,705.75 d |
| 44 yr | 16,071 d |
| 45 yr | 16,436.25 d |
| 46 yr | 16,801.5 d |
| 47 yr | 17,166.75 d |
| 48 yr | 17,532 d |
| 49 yr | 17,897.25 d |
| 50 yr | 18,262.5 d |
| 60 yr | 21,915 d |
| 70 yr | 25,567.5 d |
| 80 yr | 29,220 d |
| 90 yr | 32,872.5 d |
| 100 yr | 36,525 d |
Frequently asked questions
How many Days are in 1 Years?
1 yr equals 365.25 d.
How do I convert Years to Days?
Multiply the yr value by 365.25. Example: 25 yr = 9,131.25 d.
What is 2.5 yr in d?
2.5 yr = 913.125 d.
Is the yr to d conversion exact?
Seconds, minutes, hours, days and weeks are exact. Months and years here use average Julian values (30.4375 days and 365.25 days), so a calendar conversion can differ slightly.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.