Calendar 2025 Week Numbers. It has 52 weeks and starts on wednesday, january 1st 2025. This page shows a calendar with calendar week numbers.

The last calendar week in 2025 begins on monday, the 29.12.2025 and ends on sunday, the 04.01.2026. 2025 begins on 01/01/2025 and ends on 31/12/2025.