Days in Year Calculator
Check days in a year.
Calculate days in any year instantly. Free leap year days checker (365/366).
Calculator Inputs
About Days in Year
Check days in a year.
Applies the full Gregorian leap rule.
Where it is used
Financial calendars, planning.
How to use the Days in Year
- Year — enter the value (e.g. 2026).
- Calculate — press the Calculate button to see the result instantly above.
Formula
366 if (y%4=0 and y%100!=0) or y%400=0 else 365.
Examples
2026
year:2026
Result: 2026 has 365 days (common year)
Frequently Asked Questions
- 1800 leap?
- No — divisible by 100 but not 400.