A cabinet door only looks right when it’s the right size. Measure well, and the doors sit even, the gaps line up, and everything opens and closes cleanly. Measure carelessly, and you end up with doors that rub, overlap, or leave crooked gaps.
The good news is that measuring cabinet doors is mostly straightforward once you know two things: how to measure the opening and how much to add or subtract based on how your doors sit. Get those right, and you can order a door and its frame that fit the first time. Let’s break it down.
What You Need to Know Before Measuring
Before you pull out the tape measure, a few minutes of groundwork saves you from mistakes later. Two things determine the size of every door you order: the kind of cabinet you have and how your doors sit in the opening. Sort those out first, along with the right tools, and the actual measuring goes quickly. Here is what to line up before you start.
Tools and Setup
You don’t need anything fancy. A good tape measure with clear 1/16-inch marks, a pencil, and some paper will do the job.
Before you measure anything, sketch your cabinet layout on paper and number each opening. Note which side the hinges go on for each door. This keeps every measurement matched to the right door, which matters as soon as you have more than one or two.
One habit worth building: measure the opening, not the old door. Old doors can warp, swell, or shrink over the years, so they are not a reliable guide. Trust the opening.
Framed vs. Frameless Cabinets
Before measuring, figure out which kind of cabinet you have, since it changes how the door sits.
- Framed (face frame): a flat frame runs around the front of the cabinet box. The door sits over or inside this frame.
- Frameless (European): there is no front frame, so the door covers the edge of the box directly.
Identifying this first tells you which measuring approach applies.
Overlay vs. Inset Doors
Cabinet doors sit in two main ways, and you measure them differently.
“Overlay” means the door sits on top of the frame and covers part of it. The amount it covers is the overlay, and the frame left showing is the reveal. Overlay comes in two common styles:
- Partial overlay: a standard 1/2-inch overlay, leaving about 1 inch of frame showing around each door.
- Full overlay: a standard 1-1/4 inch overlay, common on frameless cabinets, leaving only a thin reveal.
Inset means the door sits flush inside the opening, level with the frame, with a small even gap all the way around. There is no overlay, so you measure it by subtracting instead of adding.
Not sure what overlay your current doors use? Close the door, put a strip of masking tape on the frame right against the door’s edge on the hinge side, then open the door and measure from the inside edge of the tape to the edge of the opening. That distance is your overlay.
How Overlay and Hinges Match
Here is a step people skip, and it causes problems. The overlay size and the hinge have to match. A 1/2-inch overlay door needs a 1/2-inch overlay hinge, a 1-1/4-inch overlay door needs a 1-1/4-inch hinge, and so on.
Changing the hinge changes how far the door sits over the frame, which changes the size you need to order. So decide on your overlay and hinge before you start calculating door sizes, not after.
How to Measure Cabinet Doors Step by Step
Now the measuring itself. Every calculation below starts from the cabinet opening, so we will begin there, then cover single doors, double doors, and inset doors.
Start With the Cabinet Opening
Measure the opening width from the left inside edge to the right inside edge. Then measure the height from the top inside edge to the bottom inside edge. Record both to the nearest 1/16 inch.
Measure each opening separately, even if several look identical. Older cabinets can vary by a sixteenth or more from one opening to the next, and those small differences add up.
Sizing a Single Door
For a single overlay door, you add the overlay to both sides of each dimension. The formula is
Door size = opening + (overlay × 2)
For a 1/2-inch overlay, add 1 inch to the width and 1 inch to the height.
Example:
- Opening: 14 inches wide × 26 inches high
- Add 1 inch to each (1/2 inch overlay on both sides)
- Door to order: 15 inches wide × 27 inches high
Drawer fronts use the same math, so you can size those the same way.
Sizing Double Doors
When two doors share one opening, they only overlay on the outer three sides, and they need a small gap where they meet in the middle. The formula for each door is
Each door width = (opening width + overlay × 2 − 1/8 inch) ÷ 2.
Door height = opening height + (overlay × 2), the same as a single door.
Example:
- Opening: 30 inches wide × 27 inches high, 1/2 inch overlay
- Width: (30 + 1 − 1/8) ÷ 2 = 15-7/16 inches per door
- Height: 27 + 1 = 28 inches
- Order two doors: 15-7/16 inches wide × 28 inches high
That 1/8 inch gap in the middle keeps the two doors from touching when the material expands a little in humid weather.
Sizing Inset Doors
Inset doors sit inside the opening with a small gap all around, so you subtract instead of add. The standard is a 1/8 inch gap on each side, which means taking 1/4 inch off each dimension:
Door size = opening − 1/4 inch
Example:
- Opening: 16 inches wide × 34 inches high
- Subtract 1/4 inch from each
- Door to order: 15-3/4 inches wide × 33-3/4 inches high
Inset doors need the most care, since the gaps show on all four sides and any unevenness is easy to spot.
Doors That Share an Opening With Drawers
Sometimes a door is not the only thing in an opening. A common case is a drawer sitting above a door with no divider between them.
In that case, start with the full opening height, subtract the drawer front height, then subtract the gaps (one at the top, one between the drawer and door, and one at the bottom). What is left is your door height. Figure out the width the same way as for any single or double door above.
Here is a quick summary of the three main formulas:
| Door type | Width formula | Height formula |
| Single overlay | opening + (overlay × 2) | opening + (overlay × 2) |
| Double overlay (per door) | (opening + overlay × 2 − 1/8″) ÷ 2 | opening + (overlay × 2) |
| Inset | opening − 1/4″ | opening − 1/4″ |
One more note: these same formulas give you the outer size of any cabinet door, including an aluminum frame door. The way the door is built does not change how you size the opening and the overlay.
Tips for Accurate Measurements
A few simple habits prevent most measuring mistakes:
- Measure twice. Take the measurement, do the math, and then check both again before you order.
- Use a rigid tape that clearly shows 1/16-inch marks. Cloth tapes and rulers are less reliable.
- Get a second set of eyes. Have someone check your numbers and calculations.
- Make a diagram. Label every opening so nothing gets mixed up.
- Sanity-check the result. If one door size looks off next to its neighbors, measure that opening again.
- Watch older cabinets. Warping, water damage, and out-of-square openings can throw off your numbers, so measure carefully.
Turning Your Measurements Into a Made-to-Order Door
Careful measuring pays off most with a door built to your numbers. When a door is made to order, the shop cuts it to the exact opening and overlay you measured, so you avoid rounding to the nearest stock size and forcing an off-the-shelf door to fit. The measurements you took carry straight through to the finished door.
This is how Aluminum X Design makes aluminum frame cabinet doors. You measure the opening and pick your overlay the same way as any door, and the frame is built to that outer size. The difference is what sits inside the frame. An aluminum frame door holds a glass or wood panel, and the maker cuts that panel to fit the frame’s inner channel, so you do not measure the panel yourself. You provide the door size, and they handle the panel and fit from there.
A few things the team confirms with you when you order, since they depend on the specific frame profile:
- The frame’s size range, so your door fits within what the profile supports
- The panel choice, whether glass or wood
- The hinge boring and the overlay-hinge match, so the door sits correctly
The frames come in a few profiles, from wide to slim, in anodized finishes like black, bronze, and sand. Paired with concealed hinged door systems, the door size, panel, and hinge are coordinated together, which keeps the fit clean. The profiles are Italian-designed and made at the Chatsworth, California, facility.
Seeing a frame in person makes the overlay and fit easier to picture than any diagram. The California showroom is open by appointment if you want to see how the frames sit on an opening before you measure for your own.
Conclusion
Measuring a cabinet door comes down to three things: measure the opening accurately, decide how the door sits, and add or subtract the right amount so the finished door and its frame fit with even gaps. Do that carefully, and your doors will line up the first time, with no rework.
If you are planning aluminum frame cabinet doors and want them built to the measurements you took, Aluminum X Design designs and manufactures cabinet door frames in Chatsworth, California, supplying trade professionals across the US. Contact the team with your opening sizes and questions, and they’ll help you get the sizing right.
FAQs
How do I measure a cabinet door?
Measure the cabinet opening width and height to the nearest 1/16 inch, decide whether your doors are overlay or inset, then add the overlay (for overlay doors) or subtract the clearance gap (for inset doors) to get the finished door size.
How much bigger should a cabinet door be than the opening?
For the common 1/2-inch overlay, the door is 1 inch larger than the opening in both width and height, since the overlay adds 1/2 inch on each side. Other overlays change that amount.
What is the difference between overlay and inset doors?
Overlay doors sit on top of the frame and cover part of it. Inset doors sit flush inside the opening, level with the frame, with a small gap all around. They are measured differently, one by adding and one by subtracting.
How do I measure for double cabinet doors?
Measure the full opening, add twice the overlay to the width, subtract 1/8 inch for the center gap, then divide by two to get each door’s width. The height is figured out the same as a single door.
What size gap should be between cabinet doors?
A 1/8 inch gap is the common standard between two doors that share an opening. It gives clearance so the doors do not touch when the material expands slightly in humid conditions.
Do the overlay and hinge need to match?
Yes. The hinge overlay has to match the door overlay. A 1/2 inch overlay door needs a 1/2 inch overlay hinge. Using a different hinge changes how the door sits and can throw off the fit.
How do I measure for an aluminum frame cabinet door?
Measure the same way as any door: get the opening size, pick your overlay, and calculate the outer door size with the standard formulas. The frame is built to that size, and the maker cuts the glass or wood panel to fit the frame, so you do not measure the panel yourself.
