How to Measure Your Kitchen for New Cabinets (Step-by-Step)
Getting accurate measurements before ordering kitchen cabinets is the single most important thing you can do to keep your remodel on time and on budget. Even a half-inch error can mean cabinets that don't fit around a window, a door that won't swing open properly, or an expensive return. The good news is that with a tape measure, a notepad, and this guide, most homeowners can do this themselves in under an hour—and our design team at HomeComforts Depot is always standing by to double-check your numbers for free.
The 30-second verdict
Skip the scroll — this is the answer.
What You'll Need Before You Start
Gather your tools first so you're not running back and forth mid-measurement. You'll need a 25-foot tape measure (longer is better for open-concept kitchens), a pencil, graph paper or a simple notepad, a level, and a stud finder if you plan to hang upper cabinets. A digital laser measurer is a nice upgrade if you have one, but it's absolutely not required.
It also helps to have a second person hold the tape at the far end of each wall—solo measurements across a 12-foot wall are notoriously prone to sag and error. Before you begin, clear countertops and move any furniture that's blocking a corner or an appliance alcove.
Step 1 — Sketch Your Kitchen Floor Plan
Draw a rough bird's-eye outline of your kitchen on paper. It doesn't need to be to scale at this stage—you're just creating a map you'll fill in with real numbers. Label each wall with a letter (Wall A, Wall B, etc.) so your notes stay organized and anyone reviewing your plan later can follow along instantly.
Mark the approximate locations of your refrigerator, range, dishwasher, and sink on the sketch. If you're planning to upgrade appliances at the same time, note the cutout sizes required by the new models—our free appliance fit check at the Marlton, NJ design studio is a great way to confirm those specs before you finalize anything.
Step 2 — Measure Each Wall (Three Times)
This is the most important step, and the one most DIYers rush. Measure each wall at three heights: near the floor, at mid-wall (roughly 36 inches up, or countertop height), and near the ceiling. Walls are rarely perfectly plumb, so you will frequently get three slightly different numbers. Always record the smallest measurement—that's your working width, because cabinets have to fit within the tightest point.
Write the measurement directly on your sketch next to the corresponding wall. Then measure the ceiling height from floor to ceiling in each corner and in the center of the room. Ceiling heights vary more than people expect, especially in older homes, and this affects how tall your upper cabinets can be.
Step 3 — Mark Windows, Doors, and Obstacles
For every window, record three numbers: the distance from the nearest corner to the edge of the window frame, the width of the window frame itself, and the height of the window sill from the floor. Upper cabinets need to clear window sills, and a sill that sits at 40 inches may limit your options depending on the upper cabinet depth you choose.
For every door, note the width of the door frame and which direction the door swings. A door that swings into the kitchen can block a full-height pantry cabinet if you're not careful. Also mark any fixed obstacles—radiators, load-bearing posts, gas shut-offs, electrical panels—because these can all influence which cabinet sizes you choose and where filler strips are needed.
Step 4 — Locate Plumbing, Electrical, and Gas Lines
You don't need to become a plumber to do this step—you just need to note where the sink drain, supply lines, and gas connection currently come through the wall or floor. Mark these on your sketch with an X. If you're keeping the sink in the same location, this determines the size of your sink base cabinet. Most standard sink bases are 30, 33, or 36 inches wide.
Electrical outlets are equally important. A well-placed outlet inside a cabinet can be rerouted, but that adds cost. Marking existing outlet locations now lets your designer place upper cabinets so outlets land in the backsplash zone rather than hidden behind a cabinet door.
Step 5 — Record Ceiling Height and Soffit Dimensions
Standard upper cabinets run 12 inches deep and come in heights of 30, 36, or 42 inches. If your ceiling is 8 feet, 36-inch uppers typically leave about 18 inches of clearance above the countertop—the standard comfortable reach zone. If you have soffits (those boxed-in areas above where cabinets will hang), measure their depth, height, and the distance from the wall so your designer knows whether to fill them in with crown molding or incorporate a taller cabinet to eliminate the gap entirely.
Step 6 — Calculate Your Cabinet Run
Now comes the fun part: translating your measurements into actual cabinet sizes. Standard base cabinets are 34.5 inches tall (36 inches with a countertop) and 24 inches deep. They come in widths from 9 inches to 48 inches in 3-inch increments. Upper cabinets are 12 inches deep and come in the same width increments.
Start at the corners and work outward, adding cabinet widths until you reach the total wall length. It's rare for a wall to land perfectly on a standard size, which is why filler strips (narrow pieces of finished wood) exist—they bridge the gap without awkward empty space. Most designers suggest planning for at least one filler strip per run. If you're designing around a built-in refrigerator or range, make sure to leave the exact manufacturer-specified clearance on either side.
Standard Cabinet Sizes at a Glance
Step 7 — Double-Check Everything Before You Order
Before submitting any cabinet order, walk through your sketch one more time and re-measure anything that felt tricky—an angled corner, a wall with a bump-out, or the area around a window. It's also worth using our online kitchen cabinet visualizer to see how different cabinet sizes and door styles look in your actual layout before you commit.
If you're ever unsure, bring your sketch and measurements into our free kitchen design studio. Our designers work with these numbers every day and can spot potential issues—like a swing-open door conflicting with a base cabinet pull-out—before they become expensive surprises. You can also explore our full range of shaker RTA cabinets and 10×10 kitchen pricing to budget accurately once your measurements are confirmed.
Shop this guide
Live prices · free nationwide shipping
Bring your sketch—or just your room dimensions—to our free kitchen design studio in Marlton, NJ and we'll build a full cabinet layout for you at no charge.
Get Your Free Design or call (844) 441-2003Frequently Asked Questions
Do I need to measure my kitchen before ordering RTA cabinets online?
Yes—absolutely. Ready-to-assemble cabinets ship in fixed sizes and are non-returnable once cut or assembled. Accurate wall, window, and ceiling measurements are required before any order is placed. Most cabinet suppliers (including us) offer free design services that use your measurements to produce a full layout before you spend a dollar.
How much space should I leave between upper and base cabinets?
The standard clearance between the countertop surface (36 inches from the floor) and the bottom of upper cabinets is 18 inches, giving you a comfortable backsplash zone and easy reach to items on the counter. Some homeowners go up to 20 inches for a more open feel, but going below 16 inches can make the space feel cramped and may restrict the use of small appliances like a stand mixer.
What is a filler strip and do I need one?
A filler strip is a narrow piece of finished wood (typically 3–6 inches wide) used to close the gap when your total cabinet run doesn't perfectly match your wall length. Almost every kitchen needs at least one. They're inexpensive and are ordered alongside your cabinets in a matching finish so the transition looks seamless. Your designer will specify where and how wide each filler needs to be once your measurements are reviewed.
Can I measure my kitchen myself, or should I hire a professional?
Most homeowners can measure their own kitchens accurately by following a systematic approach like the one in this guide. The key is measuring every wall in multiple spots and not rounding up. If your kitchen has an unusual shape—an angled wall, a peninsula, or a bay window—it's worth having a professional or an experienced designer review your sketch before you finalize the cabinet order. Our free design consultation in Marlton, NJ is available for exactly this purpose, with no purchase required.
