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)
  • Published, deterministic fit rules
  • Sources cited on every reference number
  • No account, no saved data

Check your own numbers

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Open under-sink kitchen cabinet, neatly organized: slide-out drawer beside the P-trap, stacked bins, low tray and cleaning caddy, warm editorial light
A cabinet that was measured before it was shopped: every piece clears the trap, the valves and the door swing.

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. Water filter / RO systemThe tank took half the cabinet; here is the rest. Trash under the sinkThe full-lane commitment and the 17-inch disposal rule. Farmhouse sinkDeep bowls, low bends: the wide-and-low layout.

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. You verify the exact product's specs against the target before buying; the site never invents prices, ratings or reviews.

Where do the reference numbers come from?

From published standards and manufacturer spec sheets: cabinet sizes from industry sizing guides, trap sizes from residential code, disposal and filter footprints from the manufacturers' own documents. Each page credits its sources with compact icon links.