Day of the Year Calculator
Find the ordinal day number for any date and see how many days are left in that year.
This is handy for planning, schedules, weather records, school projects, and date-based tracking.
Result
--
Run the calculation to see the ordinal day.
| Metric | Value |
|---|---|
| Day number | -- |
| Days left in year | -- |
| Total days in year | -- |
| Leap year | -- |
| Year progress | -- |
Quick Answer
The day of the year is the date's position in the calendar year, starting with January 1 as day 1.
How to Calculate
- Enter a date.
- Click Calculate.
- Read the day number and the remaining days in the year.
Formula
Day of the year = number of days since January 1 + 1
Days left = total days in the year - day number
Worked Examples
Example 1: January 1 is day 1.
Example 2: December 31 is day 365 in a normal year and day 366 in a leap year.
Example 3: March 1 is day 60 in a non-leap year and day 61 in a leap year.
How to Interpret Your Results
| Output | Meaning | Action |
|---|---|---|
| Day number | The selected date's position in the year. | Use it for annual planning or records. |
| Days left | How many days remain after that date. | Helpful for deadlines and year-end schedules. |
| Leap year | The year has 366 days instead of 365. | Adjust date-based calculations if needed. |
Frequently Asked Questions
The calculator handles leap years, so February 29 is only valid in leap years.
Yes. The date field defaults to today's date, so you can calculate it immediately.
It shows how far through the year the chosen date is as a percentage.
Related Calculators
References
- OmniCalculator reference page
- The ordinal day is counted from January 1 as day 1.
- Last reviewed: March 2026.