About & Methodology
Under Sink Fit turns cabinet measurements into safe organizer sizes using published, deterministic rules: a 0.5 in margin, estimated plumbing bands, height ceilings and the door opening as a hard limit. Recommendations are size classes with search links, never invented prices or reviews.
What this site is
Under Sink Fit is a measurement-first buying aid for under-sink storage. It exists because the thing that decides fit — your plumbing — never appears in a product listing. The site asks for the numbers a listing cannot know, applies published rules, and returns sizes that are safe to shop.
The rules, in the open
Every result is deterministic: the same inputs always produce the same outputs. The core constants: a 0.5 in safety margin on width and depth; a center plumbing band estimated at 28% of cabinet width (5–8 in) for a centered trap and 36% (7.5–11 in) for a disposal; a side-pipe band of 30% (5–8 in); rear losses of 1.5 in for protruding valves, 3.5 in for a filter or tank, 2 in for rear-wall plumbing; height ceilings of 10 in for a low trap and usable height minus 2 in for a mid trap; and the clear door opening as a hard pass-through limit for rigid boxes. These are conservative planning values drawn from common US trap and disposal geometry; your tape measure always overrides them.
What the recommendations are
Size classes, not specific models: honest dimension targets like “narrow slide-out, shop at or under 8 in wide.” The site shows no prices, no star ratings and no availability claims, because it cannot verify them; the product’s own specification table makes the final call. Retail search links appear only when the affiliate program is configured, and are always marked sponsored.
Sources, cited quietly
Reference numbers that come from outside — cabinet standards, residential plumbing code, disposal and filter spec sheets — are credited with compact icon links at the end of the section that uses them. The icons open the original document in a new tab and carry rel="nofollow": they exist so you can verify, not as navigation. Everything else on the site is computed from your inputs by the published rules above.
Units and audience
Written for US cabinets, in inches, with a one-tap centimeter toggle on results. Content is reviewed when the underlying rules or reference tables change; each page carries its date in the page metadata.
Contact and corrections
Spotted a number that does not match your cabinet reality? Email [email protected] — reference-table corrections ship fast.
Common questions
Does Under Sink Fit sell products?
No. It provides measurements, fit rules and size targets. When retail links are enabled they search Amazon for a size class and the site may earn an affiliate commission; purchases always happen on the retailer's site under its terms.
Are fit results guaranteed?
No: they are deterministic estimates from your inputs and published rules, with a 0.5 in margin built in. Your tape measure and the product's spec table make the final call.
Why show size classes instead of specific models?
Model specs and listings change weekly; dimension classes do not. Teaching the size that fits outlasts any specific link, and it keeps recommendations honest.
How are external sources handled?
Factual claims that come from a standard, a building code or a manufacturer's spec sheet are credited with small icon links at the end of the relevant section. They open in a new tab and are marked nofollow; they exist for verification, not navigation.