Convert between days and years instantly with this days to years calculator. Enter a number of days to see how many years that equals, or flip it around and enter years to get days.
Days to years 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: days to years
Here are some common conversions people search for:
| Days | Years (365.25/Leap Years) | Years (365) |
|---|---|---|
| 30 days | 0.08 years | 0.08 years |
| 90 days | 0.25 years | 0.25 years |
| 180 days | 0.49 years | 0.49 years |
| 365 days | 1.00 years | 1.00 years |
| 500 days | 1.37 years | 1.37 years |
| 730 days | 2.00 years | 2.00 years |
| 1,000 days | 2.74 years | 2.74 years |
| 1,825 days | 5.00 years | 5.00 years |
| 3,650 days | 9.99 years | 10.00 years |
| 10,000 days | 27.38 years | 27.40 years |
The famous "1,000 days" milestone? It equals about 2 years and 9 months. And "10,000 days" (there's a Tool album by that name)? That's roughly 27.4 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 - 10,000 days is 27.40 years using 365, but 27.38 years using 365.25. (cc: Tool.)
Years to days: the reverse conversion
The second section of the tool converts years to days. Enter any number of years (decimals work too) and get the equivalent in days and weeks. Try entering milestone ages:
- 18 years = 6,575 days (adulthood in most countries)
- 21 years = 7,671 days (legal drinking age in the US)
- 65 years = 23,741 days (traditional retirement age)
- 100 years = 36,525 days (a century!)
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:
Also try our other calculators and tools.
