Convert between years and days instantly with this years to days calculator. Enter a number of years to see how many days that equals, or flip it around and enter days to get years.
Years to days converter
The calculator updates in real-time as you type. Toggle the checkbox to switch between using 365.25 days per year (accounting for leap years) or a simple 365-day year.
Quick reference: years to days
Here are some common conversions people search for:
| Years | Days (365.25/Leap Years) | Days (365) |
|---|---|---|
| 0.5 years | 183 days | 183 days |
| 1 year | 365 days | 365 days |
| 2 years | 731 days | 730 days |
| 3 years | 1,096 days | 1,095 days |
| 5 years | 1,826 days | 1,825 days |
| 10 years | 3,653 days | 3,650 days |
| 18 years | 6,575 days | 6,570 days |
| 21 years | 7,670 days | 7,665 days |
| 50 years | 18,263 days | 18,250 days |
| 100 years | 36,525 days | 36,500 days |
Some milestone conversions: 5 years is roughly 1,826 days (260 weeks). A decade clocks in at about 3,653 days. And a full century? That's 36,525 days - assuming you account for leap years.
Why 365.25 days per year?
A standard year has 365 days, but every four years we add a leap day (February 29th). Over a four-year cycle, that averages out to 365.25 days per year.
For short time spans, the difference is negligible. But over decades, it adds up - 100 years is 36,500 days using 365, but 36,525 days using 365.25. That's 25 extra days over a century!
Days to years: the reverse conversion
The second section of the tool converts days to years. Enter any number of days and get the equivalent in years, plus a breakdown into years, months, and days. Try some famous milestones:
- 1,000 days = 2.74 years (the famous "thousand days" milestone)
- 10,000 days = 27.4 years (there's a Tool album by that name)
- 20,000 days = 54.8 years (Nick Cave's documentary)
- 30,000 days = 82.1 years (about average life expectancy)
Other time conversion tools
Visit our collection of other time conversion tools if you'd like to switch between other units of time. Here's what we have:
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