What this tool answers
You need a first-pass hole-saw kit size before buying. Enter needed hole diameter in millimetres. The calculator names the smallest class on this site’s ladder — 68, 114, or 200 mm — or returns NO_MATCH. It is not a magnetic annular-cutter selector and not a drywall circle-cut depth calculator.
Diamond vs bi-metal vs adjustable
Diamond kits suit tile and stone with appropriate speed/wet practice. Bi-metal kits cover wood, plastic, and many metals within published limits. Adjustable circle cutters expand max diameter for large openings but still need material and RPM checks.
Class ladder on this site
Classes use published VEVOR US max-diameter claims checked 2026-09-10: 68 mm diamond tile kit, 114 mm (4.5 in) bi-metal kit, and 200 mm adjustable cutter. Matching rule: smallest class where published max diameter ≥ needed hole.
When the answer is NO_MATCH
If needed hole exceeds 200 mm, this site returns NO_MATCH. Typical next steps: a larger industrial cutter, a different process, or verifying units (inches vs mm). Do not force a consumer kit past this screen.
Sources
VEVOR US hole-saw product pages for max-diameter claims (checked 2026-09-10). Consumer practice matching saw type to material. Safety framing follows common manufacturer warnings on clamping, RPM, and PPE.