Overview
The day-of-year number helps track progress through an annual plan or read reports that use ordinal dates. The tool also shows the share of the year elapsed and remaining.
Formula
Count the days from the start of the year to the chosen date, then add 1 because January 1 is day one. Divide by the year length for the percentage.
How it works
Pick the date
Any day within the year.
Read the number
The day order and remaining days appear.
Check the share
See how much of the year has elapsed as a percentage.
Worked examples
February 1
In a common year, February 1 is day 32 of the year.
December 31
The last day is 365 in a common year and 366 in a leap year.
Frequently asked questions
Does the count include today?
Yes, the selected date itself is included in the day-of-year number.
Do leap years matter?
Yes. The year length and the numbering after February differ between common and leap years.
What is the elapsed share?
It is the day number as a percentage of the year length, useful for progress tracking.
This calculator is for educational and informational purposes only and is not a substitute for professional advice.