CountBusinessDays is a free, fast, privacy-friendly toolkit for calculating business days. It includes:
• Count business or calendar days between dates
• Add or subtract business days
• Invoice age & Net-term due dates
• Remaining business days this month/quarter/year
• Cascading deadlines & fiscal year tools
• ISO week calculator
• Custom holidays (saved only in your browser)
Supports U.S. Federal and Canadian holidays with correct observed dates.
