How to Measure Your Kitchen for New Cabinets in 7 Steps

You can change your mind about a door style, a finish, or the whole layout. What you can't talk your way out of is a cabinet that's two inches too wide. Measuring is the quiet step that decides whether installation day goes smoothly or turns into a second order and three more weeks of waiting.

It isn't difficult. It just has to be done in order, written down, and checked. Grab a tape measure, a pencil, and a sheet of graph paper, and work through these seven steps.

1. Sketch the Room First

Draw the kitchen as if you were looking down at it from the ceiling. Each wall becomes a straight line, each corner a point where two lines meet. Label the walls A, B, C, and D, rough in the doors, windows, sink, and appliances where they sit, and leave white space around the sketch for numbers.

What to have within reach

A 25-foot tape measure with a locking tab. A shorter tape is handy inside cabinets.
A pencil, not a pen. You will erase things.
Graph paper, or a floor-plan app you can type dimensions into.
Your phone, for photographs of awkward details — a bulging pipe, a window crank, an outlet tucked behind a counter.
A laser measure if you own one, but confirm critical numbers with a tape. Lasers struggle in bright rooms and won't tell you if a wall bows.

Write every dimension in inches, to the nearest eighth, and keep it that way — 100 inches rather than 8 feet 4 inches. Converting fractions halfway through a sketch is where mistakes start.

2. Measure Each Wall Run at Three Heights

Walls are rarely straight, and a wall is rarely the same length at the floor as it is at the ceiling. Measure corner to corner at three points:

Base cabinet height, about 34½ inches off the floor.
Wall cabinet height, roughly 54 inches, where the bottom of most uppers lands.
Near the ceiling or the bottom of the soffit, wherever your tallest units will sit.

If the numbers differ, the wall bows or the room is out of square, and the smallest number is the one your designer needs. The gap gets absorbed by filler strips or scribe molding — normal, but only if it's on the drawing.

Note any run that turns a corner. Measure it as one continuous bank with a corner at a specific point, not as two separate walls that happen to meet.

3. Record Every Opening

Windows and doors decide where cabinets can go, so they need more than a rough position on your sketch.

Windows

Write down the opening width and height, the sill height above the floor, and the distance from each side of the trim to the nearest corner. Note whether the window sits centered on the wall; three inches off-center changes the cabinets on either side. If a casement crank sticks out, measure how far — cabinet doors need to swing past it.

Doors

Measure the casing width and height, the gap from the casing edge to the nearest corner, and which way the door swings. A door opening into the kitchen can collide with a drawer stack, and the fix is sometimes a shallower cabinet rather than a new layout.

Outlets, switches, and vents

For each, record the height off the floor — most counter outlets sit between 42 and 48 inches — and the distance from a fixed corner. Outlets can be moved, but knowing where they are prevents a cabinet back panel from covering the switch you use every morning.

4. Measure Appliance Openings, Not Appliances

A spec sheet describes the appliance; your cabinets have to fit the hole it lives in. Measure each opening at the front, middle, and back — walls and cabinet ends taper — plus depth and height at both sides.

Refrigerator: opening width, depth, and height, including any cabinet above. Note the hinge side and how far the doors swing.
Range or cooktop: the opening width, and whether the range is freestanding or slide-in. Slide-ins usually need the countertop to overlap the range sides, which changes the cabinets beside it.
Dishwasher: opening width, plus the cabinet panel or adjacent cabinet the unit mounts to.
Over-the-range microwave or hood: opening width, cabinet height above, and where the vent runs.

Don't forget the small openings: a built-in microwave trim kit, a wine fridge, a trash pull-out, a coffee station with a raised counter. Each one is a dimension somebody has to build to.

5. Check Square, Level, and Ceiling Height

Pull two diagonal measurements across the room, corner to corner, and compare them. If they differ by more than about half an inch, the corners aren't square, and cabinets set into them will show a gap. Then check what stops being level once you look closely.

Ceiling height at each corner and in the middle of the room. If it varies, tall cabinets need scribing or a filler across the top.
Floor slope, checked with a long level or straightedge. Base cabinets get shimmed, but a real slope changes how much toe kick you trim.
Soffit depth and height at both ends. Soffits are often not parallel to the wall they sit on.

6. Note the Obstructions Nobody Remembers

Walk the room with your tape and look low, middle, and high. Anything sticking out of a wall or running along it belongs on the sketch, with a distance from a corner and a height off the floor.

Plumbing supply lines, drain traps, and shutoff valves
Gas lines and radiator pipes
Heating vents, returns, and baseboard heaters
Electrical panels, thermostats, doorbell chimes, and cable plates
Exposed ductwork along the ceiling
Baseboard height and thickness — cabinets sit against drywall, so baseboard usually has to come off or be notched

A pipe rising four inches off the floor vanishes behind a base cabinet. A pipe rising three feet does not, and it may decide where the sink base goes.

7. Recheck Before Anyone Orders Anything

Read the sketch back to someone else, number by number, while they watch the tape. Photograph the tape against each long wall and each tricky corner; photos show whether you measured to the trim or to the drywall, which is exactly the ambiguity that causes returns.

Mark the smallest dimension on every wall and highlight it. Then, before the order is placed, have whoever is designing or installing the cabinets do a final field measurement. Cabinet orders are built to the dimensions on that paperwork, and once production starts, changes mean delays and often extra cost.