Business Days Calculator
Free Business days tool for time & date. Enter your details to get instant, tailored results and guidance. Free to use with no signup required.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Business Days = Total Days - Weekends
The calculator steps through every calendar day between your start and end dates and classifies each as a weekday (Monday-Friday) or weekend (Saturday-Sunday), summing the weekday count. This is the standard method used for shipping estimates, contract deadlines ('5 business days'), and payroll periods. It does not automatically exclude public holidays — subtract those manually for a jurisdiction-specific count, since holiday calendars vary by country, state, and employer.
Worked Examples
Example 1: Full calendar year 2024 (leap year)
Problem:Count business days from Jan 1 to Dec 31, 2024
Solution:Total calendar days = 366 (2024 is a leap year)\nWeekend days = 104 (52 weeks × 2)\nBusiness days = 366 - 104 = 262
Result:262 business days | 104 weekend days | 366 total days
Example 2: A 3-week project deadline
Problem:A contract is signed on a Monday and requires delivery 15 business days later — what calendar date is the deadline?
Solution:15 business days spans 3 full work-weeks (15 ÷ 5 = 3 weeks) plus the 2 intervening weekends\nTotal calendar days = 15 + 2×2 = 19 calendar days from the start date\nCounting forward 19 calendar days from a Monday lands on a Friday three weeks later
Result:15 business days ≈ 19 calendar days (skips 2 weekends)
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy