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Calculator Tools
Calendar Calculators

Day of the Year Calculator

Ordinal day number for a date, and the date for a given day number.

Also known as julian day number, ordinal date calculator, what day number is it.

Enter values

Results update as you type.

Result

Day of the year

310

Days remaining
55
Year completed
84.93%
Days in this year
365
Week number
45
Quarter
Q4

About the Day of the Year Calculator

Ordinal day number for a date, and the date for a given day number.

Also known as: julian day number, ordinal date calculator, what day number is it, days into the year.

How to use this calculator

  1. Enter calculate.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Day of the Year formula

day number = date − 1 January + 1

Worked example

Using the values pre-filled in the calculator above:

  • Calculate: Day number from a date
  • Date: 2026-11-06

the calculator returns:

  • Day of the year: 310
  • Days remaining: 55
  • Year completed: 84.93%
  • Days in this year: 365