Pipe / Conduit Hole Size Calculator

Sizing aid based on entered outside diameter and clearance. Project, firestop, sleeve and code requirements may require a different opening. Not a magnetic-drill or annular-cutter tool.

Units Application Pipe / conduit standard Nominal size Object outside diameter Clearance per side Sleeve? Sleeve OD (if yes) Drill (optional, filters bit lookup)

Uses verified standard rules when available. Project, firestop, sleeve and code requirements may require a different opening. No global OD+X authoritative rule.

Products for this page

Core drill

Hilti DD 110-W

6.375" max · corded

Handheld Hilti BI+ wet concrete / dry masonry coring in the DD 110-W diameter bands.

Check on Amazon Specs

Core drill

BLUEROCK 4Z1

4" max · corded

Budget handheld (optional stand) for 1", 4" holes in concrete, block, brick, or asphalt.

Check on Amazon Specs

Core drill

BLUEROCK 12Z1

12" max · corded

Check on Amazon Specs

Core drill

VEVOR 6.3" 2000W Handheld

6.3" max · corded

Larger handheld budget coring when 4" machines are too small and a stand is not required.

Check on Amazon Specs

Paid links. Specs on this site come from manufacturer documentation, not from the retailer.