Days in a Month Calculator
Find how many days, weekdays and weekend days are in any month, and the weekday of its first and last day.
Your inputs
Results
Days in the month
28
- Weekdays (Mon–Fri)
- 20
- Weekend days
- 8
- First day
- Sunday
- Last day
- Saturday
✓Exact calculation — rounded only for display
What this calculator does
Month lengths vary from 28 to 31 days and the number of working days varies even more. This tool shows both, plus the weekday each month starts and ends on, for scheduling and payroll.
Formula and method
30 days for April, June, September and November; 31 for others; February 28 or 29 in leap years.
Worked example
Calculated by this tool with its default inputs:
Inputs
- Year: 2026
- Month: February
Results
- Days in the month: 28
- Weekdays (Mon–Fri): 20
- Weekend days: 8
- First day: Sunday
- Last day: Saturday
How to read the results
Weekday counts assume a Saturday–Sunday weekend.
Assumptions and limitations
- Use the working days calculator for other weekends.
Questions
Is there a trick for remembering month lengths?
The knuckle method: knuckles are 31-day months, gaps are shorter months.
Methodology and verification
- Result type
- Exact mathematical calculation (rounded only for display)
- Formula version
- 1.0
- Automated verification
- 3 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy