Cabinet Door Calculator

The cabinet door calculator adds twice the overlay to each opening dimension for a full overlay door, or subtracts twice the reveal gap for an inset door. It returns the door width and height in inches and the total door area in square feet for the number of doors you enter.

Last reviewed September 2026Method & sources Report an error

Not to scale.

Door Width

15.000 in

Breakdown
Door Width	15.000 in
Door Height	25.000 in
Total Door Area	2.60 sq ft

How to Calculate Cabinet Door

A full overlay door covers the cabinet opening plus a set overlap on each edge (commonly 1/2 in.), so door size is `opening size + (2 × overlay)` in both dimensions. The overlay is added on both the left/right and top/bottom sides. An inset door sits flush inside the opening instead. It needs to be slightly smaller than the opening to leave a small reveal gap for the door to swing without binding. Door size is `opening size − (2 × reveal gap)`.

Example: 14 in. × 24 in. opening, full overlay style, 1/2 in. overlay per side

A 14 in. × 24 in. opening, full overlay style, 1/2 in. overlay per side, 10 doors: 1. Door width: 14 + (2 × 0.5) = 15 in. 2. Door height: 24 + (2 × 0.5) = 25 in. 3. Area per door: (15 × 25) ÷ 144 = 2.60 sq ft 4. Total area: 2.60 × 10 = 26.04 sq ft The same opening as an inset door with a 1/8 in. reveal gap instead would need a 13.75 in. × 23.75 in. door, smaller than the opening rather than larger.

Cabinet Door: Compare Scenarios

Scenario	Door Width	Door Height	Total Door Area
Small (12x18 in. upper cabinet)	13.000 in	19.000 in	1.72 sq ft
Medium (14x24 in. base cabinet)	15.000 in	25.000 in	2.60 sq ft
Large (24x36 in. pantry cabinet)	25.000 in	37.000 in	6.42 sq ft

What Is Cabinet Door?

A cabinet door calculator converts a cabinet opening's dimensions into the actual door size to order or build. It accounts for the two common cabinet door styles. A full overlay door covers the opening and part of the face frame or box edge. An inset door sits flush within the opening. Getting this conversion right matters, because a door sized to the opening itself, rather than adjusted for overlay or inset gap, produces a door that doesn't fit correctly.

Cabinet Door: Pros and Cons

Pros

Handles both full overlay and inset door styles, since they adjust the opening size in opposite directions
Reports total door area alongside individual door dimensions, useful for estimating material for a full kitchen's worth of doors at once
Overlay and reveal gap are both adjustable, since they vary by cabinet hardware and personal preference rather than being fixed constants

Cons

Doesn't account for a partial overlay style, a middle ground between full overlay and inset that is common on older cabinetry with face frames. That style uses a different, smaller overlay amount than full overlay's typical 1/2 in.
Doesn't include hinge boring or hardware placement, which depends on the specific hinge system being used
Assumes a single uniform opening size for all doors in the quantity entered. A kitchen with different-sized cabinet openings needs each size calculated separately

Cabinet Door: What a Pro Checks

Check your actual hinge overlay spec before cutting. It commonly runs around 1/2 in. per side but ranges from about 3/8 to 5/8 in. depending on the hardware. Using the wrong overlay throws off both door dimensions.
Don't skip the reveal gap on an inset door. Even 1/8 in. per side matters, since a door cut exactly to the opening size binds and won't swing freely.
Measure older face-frame cabinets directly rather than assuming full overlay. Many use partial overlay, a smaller overlay amount than the full-overlay default here.

Frequently Asked Questions

How do I measure for a full overlay cabinet door?

Measure the cabinet opening's width and height, then add twice your overlay amount (commonly 1/2 in. per side) to each dimension. A 14 in. × 24 in. opening with a 1/2 in. overlay needs a 15 in. × 25 in. door.

How much smaller should an inset door be than its opening?

Subtract twice your reveal gap (commonly 1/8 in. per side) from each dimension. A 14 in. × 24 in. opening with a 1/8 in. gap needs a 13.75 in. × 23.75 in. door. It's smaller on all four sides to allow the door to swing freely without rubbing.

What is the difference between full overlay and inset cabinet doors?

A full overlay door sits on top of the cabinet box or face frame, covering the opening and extending slightly beyond it on all sides. It's the more common modern style. An inset door sits flush within the opening itself. It gives a more traditional, furniture-like look but requires more precise fitting.

What overlay amount is standard for cabinet doors?

1/2 in. per side is a very common default for full overlay doors, though it can range from about 3/8 in. to 5/8 in. depending on the hinge system and cabinet manufacturer. Check your specific hinges' overlay specification before finalizing door size.

What is partial overlay?

Partial overlay is a style common on older or traditional face-frame cabinetry where the door covers less of the face frame than a full overlay door would, leaving more of the frame visible between doors. It uses a smaller overlay amount than full overlay. This calculator's full overlay option can approximate it by entering your specific (smaller) overlay measurement.

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