How to calculate how many days are left in the year?
There're several ways to calculate how many weeks are left in the year:
Method One: Manual Calculation
Steps:
- Confirm 2025 is not a leap year
Since 2025 is not divisible by 4 (2025 ÷ 4 = 506.25), February has 28 days. - Determine the current date (e.g., September 15, 2025).
- Calculate days left in the current month:
September: 30 total days – 15 days passed = 15 days remaining. - Add days for subsequent months:
- October: 31
- November: 30
- December: 31
Total: 15 + 31 + 30 + 31 = 107 days left.
Method Two: Use a Date Calculator Tool
- Input the current date and December 31, 2025 into our online date difference calculator. You'll get the answer immediately.
Method Three: Excel/Google Sheets
- Formula:
=DATE(YEAR(TODAY()), 12, 31) - TODAY()
Note: Format the cell as a number to display the remaining days.