Cabinet Door Calculator – Loan calculator

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Cabinet Door Size Calculator

Opening Width (Inches)

Opening Height (Inches)

Overlay Amount (Inches)

Number of Doors Single Door Double (Pair) Doors

Gap Between Doors (Inches)

Required Door Dimensions

Individual Door Width: 0″

Individual Door Height: 0″

Total Number of Doors: 0

Total Square Footage: 0 sq. ft.

How to Calculate Cabinet Door Sizes

Measuring for new cabinet doors is a critical step in any kitchen remodel or DIY furniture project. Whether you are building face-frame cabinets or frameless European-style cabinets, the math remains consistent based on your desired "overlay."

1. Measuring the Opening

Always measure the actual clear opening of the cabinet frame. Measure the width from the inside edge of the left stile to the inside edge of the right stile. Measure the height from the top rail to the bottom rail. Do not measure your old doors, as they may have been sized incorrectly for the current hardware.

2. Understanding Overlay

The "Overlay" is the amount the door overlaps the cabinet face frame. Common overlays include:

1/2″ Overlay: The door is 1 inch wider and 1 inch taller than the opening.
Full Overlay: The door covers almost the entire face frame (usually 1-1/4″ or more).
Inset: The door sits inside the opening. For inset doors, you actually subtract a gap (usually 3/32″) from the opening dimensions.

3. The Math for Single vs. Double Doors

For Single Doors:
Door Width = Opening Width + (Overlay x 2)
Door Height = Opening Height + (Overlay x 2)

For Double Doors (Pairs):
Door Width = ((Opening Width + (Overlay x 2)) – Reveal Gap) / 2
Door Height = Opening Height + (Overlay x 2)

Practical Example

If you have an opening that is 20″ wide and 30″ high, and you want a 1/2″ (0.5″) overlay with two doors and a 1/8″ (0.125″) gap between them:

Total Width including overlays: 20 + (0.5 * 2) = 21″
Subtract the gap: 21 – 0.125 = 20.875″
Divide for two doors: 20.875 / 2 = 10.4375″ per door.
Height: 30 + (0.5 * 2) = 31″ per door.

Common Mistakes to Avoid

Ensure you account for hinges. Some concealed hinges require a specific overlay to function correctly without hitting adjacent cabinets or walls. Always double-check your measurements in at least two places (top and bottom) to ensure the cabinet is square.