nec4engine.com — Global NEC4 Engineering Tools Platform

NEC4 Tools for Engineers, by an Engineer

Free tools for NEC4 Compensation Events, Working Days, and Clause Reference. Built by a practising NEC4 professional for the global engineering community.

Contract Profile

Hong Kong Edition · Option A

Calendar Days Calculator

Calculate calendar days between dates, or add days from a start date. Ref: NEC4 Clause X60.1

Start Date

End Date

Include end date in calculation

⚠️ Result is for reference only. Actual CE periods should be determined per contract terms and professional advice.

Working Days Calculator

Business days between two dates, including or excluding weekends and public holidays. Ref: NEC4 Clause X60.1

Start Date

End Date

Include end date in calculation (+1 day)

Holidays for

What to exclude

Custom Holidays (optional)

⚠️ Result is for reference only. Actual CE periods should be determined per contract terms and professional advice.

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NEC4 Clause Search

Full clause reference with commentary

CE Cost Calculator

Option-aware cost assessment

Delay Analyzer

Programme impact analysis tool