Calendar
A clean monthly and yearly calendar with week numbers and quick navigation.
Related tools
- Date CalculatorAdd or subtract days, weeks, months, and years from any date to find a new date.
- Days Between DatesCalculate the exact duration between two dates in days, weeks, months, and business days.
- Age CalculatorFind your exact age in years, months, days and hours, plus your life in numbers: heartbeats, full moons and laps around the sun.
- Dog Age CalculatorConvert dog years to human years by size, with a cat age calculator and a full chart.
- Due Date CalculatorEstimate your pregnancy due date, how many weeks along you are, and your trimester dates from your last period.
- Week NumberLook up the ISO week number for today or any date, and see the weeks of the year.
How to use it
- 1
Open the calendar
The calendar loads on the current month with today highlighted automatically.
- 2
Navigate months
Use the arrows to move between months, or jump straight to any month of the year.
- 3
Read week numbers
The left column shows the ISO week number for each row, handy for planning.
- 4
Return to today
Press the Today button any time to snap back to this month.
Perfect for every need
Weekly planning
See ISO week numbers alongside dates to align with sprints, payroll, and schedules.
- Sprint planning
- Payroll cut-offs
- Shift rotations
Scheduling & deadlines
Quickly count days and pick dates for appointments, events, and due dates.
- Booking appointments
- Setting deadlines
- Event planning
Everyday reference
A distraction-free calendar you can open on any device without installing anything.
- Checking a weekday
- Finding a date fast
- Full-year view
Frequently asked questions
What are ISO week numbers?
ISO 8601 week numbering counts weeks starting on Monday, where week 1 is the week containing the year's first Thursday. This calendar shows that number in the left column.
Does the calendar start weeks on Monday?
Yes. Weeks run Monday through Sunday, matching the ISO standard used across most of the world for business and scheduling.
Can I view a whole year at once?
Yes. Visit /calendar/2026 (or any four-digit year) for a full twelve-month overview of that year.
Do I need to install anything?
No. The calendar runs entirely in your browser, works offline once loaded, and is free with no sign-up.