What this tool answers
You need a first-pass belt-disc combo sander before buying. The calculator takes the sanding belt width you need in inches, then names the smallest class on this site’s ladder (1, 4, or 6) that clears that width. It is not a motor-power certification, dust-collection design, or substitute for manufacturer instructions.
Belt width greater than zero
Accepted inputs are positive belt widths in inches. Zero and non-positive values return validation errors with no purchase CTA. Fractional widths are allowed when they are greater than zero.
Class ladder on this site
Classes are returned as belt-width ceilings with belt × disc labels: 1 (1 × 30 in belt · 5 in disc), 4 (4 × 36 in belt · 6 in disc), and 6 (6 × 48 in belt · 9 in disc). The tool picks the smallest class whose ceiling is greater than or equal to needed_belt_width_in.
Confirm live belt and disc sizes
Listings can change. Confirm the published belt size and disc diameter on the live product page before you buy. This site does not invent specs beyond the checked merchant pages.
Dust port and eye shield
Confirm dust-collection port size and any eye shield on the listing. Connect dust collection when available. An open belt or disc can throw grit — plan capture and PPE together.
Eye protection and workpiece control
Wear eye protection when sanding. Secure the workpiece; do not freehand thin stock against a moving belt or disc. Keep fingers clear of the belt tracking and disc face. This site does not certify shop setups.
When the answer is NO_MATCH
Belt widths above 6 in exceed this consumer ladder and return NO_MATCH with no CTA. Do not force a 6 × 48 class for a wider belt need — use a larger industrial machine or a different plan.
Sources
Shop practice of sizing belt-disc combos to the belt width you need. Manufacturer safety culture around dust ports, eye shields, eye protection, and workpiece clamping. VEVOR US belt-disc sander product pages for class sizes dated in products.json (checked 2026-09-10).