Under Sink FitMeasure first. Then buy.

Under-sink storage, by the numbers

Measure once. Buy storage that clears the pipes.

Every under-sink return starts the same way: the cabinet label said it would fit. This site works from the four numbers that actually decide fit — inside width, usable depth, height to the lowest bend, and the clear door opening — and turns them into safe shopping sizes.

Open the fit checker Measure first (5 min)

Check your own numbers

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in
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Three tools, one tape measure

Fit CheckerEnter cabinet measurements, get safe product dimensions, risk flags and a shortlist. Will It Fit?Paste a product's width, depth and height and check it against your cabinet. Layout PlannerTurn measurements into a zone-by-zone plan with exact size targets.

Find your exact problem

These pages target the searches people make after something did not fit: the pipe in the way, the door that is too narrow, the drawer that stops two inches short.

Offset or side pipeOne wide clear lane; how to size and use it. Garbage disposalWhat the body blocks and the side-lane math. Low-hanging trapEverything that exists under an 11-inch bend. Won't fit through the doorFive rescues before the return label. Drawer won't closeFind the blocker in four checks. Rental cabinetNo screws, no adhesive damage, full deposit.

Layouts by cabinet size

Pick your width and room. Each page maps all four trap positions with lane sizes, ceilings and a pre-filled fit check.

Kitchen

Bathroom vanity

Laundry sink

How the checker decides

  1. Subtract the margin. 0.5 in comes off width and depth before anything else; tight fits scrape and jam.
  2. Map the blocked band. The trap or disposal claims a center or side band estimated from your inputs; what remains are the clear lanes.
  3. Apply the door law. A rigid box can never exceed the clear door opening, no matter how wide the interior is.
  4. Cap the height. Everything under or near the trap stays below the lowest bend, with lift-out room.

The full rules, constants and their sources are published on the methodology page. No black box: your numbers in, the same numbers out, every time.

Common questions

What does Under Sink Fit actually do?

It turns cabinet measurements into buying limits: enter width, depth, height to the lowest pipe, door opening and plumbing layout, and it returns safe product dimensions, a zone map and size-matched organizer classes.

Why measure before shopping for an under-sink organizer?

Because the constraint is never the cabinet label: it is the door opening, the trap bend height and the clear lanes beside the plumbing. Products fail on those three numbers, and none of them appear in a product listing.

Is the fit checker free and does it need an account?

Free, no account, no saved data. Results are computed from the numbers you enter and shown on the page; share the result by copying the link.

Are the recommendations real products?

They are size classes: honest dimension targets like a narrow slide-out under 8 in wide, with links that search Amazon for that class. You verify the exact product's specs before buying; the site never invents prices or reviews.