Plan workdays, invoice dates, and business deadlines without spreadsheet drift.
BusinessDayKit combines practical calculators with U.S. federal holiday data so you can count business days, add workdays, and estimate invoice due dates with a clear source trail.
Core calculators
Business Days Calculator
Use a focused tool with U.S. federal holiday handling and a clear calculation note.
Add Business Days Calculator
Use a focused tool with U.S. federal holiday handling and a clear calculation note.
Invoice Due Date Calculator
Use a focused tool with U.S. federal holiday handling and a clear calculation note.
Net 30 Due Date Calculator
Use a focused tool with U.S. federal holiday handling and a clear calculation note.
Built for AdSense-safe utility value
The site is built around calculators and verifiable calendar data rather than daily AI articles. U.S. federal holidays are sourced, dates are calculated by code, and explanatory copy is kept short.
Results are intended for general planning. Payroll, tax, labor-law, and contract obligations can vary by employer, state, agreement, and policy, so official sources should be checked for decisions.
Data sources
Federal holiday records reference the U.S. Office of Personnel Management holiday schedule. Pages include last-updated text so generated data remains auditable.
View 2026 holidays