Free estimate — verify against local code before building
Cabinet Door Size Calculator
Convert cabinet openings into finished overlay or inset door dimensions, hinge count, material area, and optional cost.
What this calculator includes
This calculator turns a field-measured cabinet opening into one or two finished door sizes using an editable overlay or inset reveal and center gap. It also totals door area, sheet-material overage, hinge quantity, and optional door and hardware cost without claiming a universal hinge-boring or fabrication tolerance.
Next step in your project
Place the cabinet work in the complete kitchen budget
Add cabinet, countertop, flooring, backsplash, appliance, trade-work, permit, and contingency scenarios.
Open Kitchen Remodel Cost Calculator →How to use this cabinet door size calculator
- 01
Measure the actual opening
Measure width and height at several points and use the cabinet maker's method for an out-of-square opening.
- 02
Choose the fit
Select overlay when the door covers the face-frame or box edge, or inset when the door fits inside the opening.
- 03
Set reveals and pairs
Enter the approved overlay or reveal, choose one or two doors, and enter the intended center gap for a pair.
- 04
Verify the hardware
Confirm hinge cup, boring setback, opening angle, plate height, door thickness, and hinges per door before fabrication.
Worked example
Example: paired overlay doors on a 30-inch opening
A 30 in by 24 in opening with a 1/2 in overlay covers 31 in by 25 in. After a 1/8 in center gap, each of two doors is 15.4375 in wide by 25 in high. Two identical openings require four doors.
Practical buying and overage guidance
Create a labeled opening schedule and confirm whether the supplier wants finished door size or opening size. Verify grain direction, edge profile, finish, pair gap, hinge boring, pulls, and replacement-door return policy before ordering.
Continue the project
Frame & Finish a Room
Plan wall framing, insulation, drywall, paint, flooring, baseboard, trim, materials, supplies, and contractor pricing in one workflow.
Open the project workflow →Calculation sources and review
Primary references and formula assumptions are linked so you can verify them against the selected product, supplier, and adopted local requirements.
Internal formula review completed July 13, 2026. What this review covers
- Blum product and assembly resources (opens in a new tab)
Hardware maker resources illustrate product-specific boring, overlay, reveal, and hinge requirements.
- AWI standards resources (opens in a new tab)
Fabrication tolerances and quality requirements depend on the selected cabinet standard and shop.
Frequently asked questions
How is an overlay cabinet door size calculated?
For a full perimeter overlay, twice the entered overlay is added to both opening dimensions. Paired doors then split the covered width after subtracting the center gap.
How is an inset cabinet door size calculated?
Twice the reveal is subtracted from opening width and height. Paired doors also subtract the center gap before dividing the width in half.
Can I use one measurement for every cabinet?
No. Openings and face frames can vary or be out of square. Measure and label each opening, then follow the door supplier's required precision and tolerances.
Does this calculate hinge-boring locations?
No. Boring pattern, setback, plate height, hinge quantity, and clearance depend on the exact hinge, door thickness, weight, and cabinet construction.
Why is material overage separate from door count?
Door count is a finished-piece quantity. Sheet yield depends on grain direction, defects, kerf, nesting, edge treatment, and available stock sizes.