Cabinet door calculator

Size one cabinet door or a pair from the opening, overlay or inset, and meeting gap.

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Opening width

Opening height

More inputs and assumptions

Overlay at each outer edge (negative for inset)

Number of doors: 1 or 2

Meeting gap for a pair

Answer

…

Size one cabinet door or a pair from the opening, overlay or inset, and meeting gap.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Formula and assumptions

Width = (opening + two outer overlays − pair gap) ÷ door count; height = opening + two overlays. Negative overlay models inset clearance. Confirm hinge and cabinet specifications separately.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Cabinet door calculator

Size one cabinet door or a pair from the opening, overlay or inset, and meeting gap.

Width = (opening + two outer overlays − pair gap) ÷ door count; height = opening + two overlays. Negative overlay models inset clearance. Confirm hinge and cabinet specifications separately.

Next: Rectangle calculator

A worked example

Example inputs: opening width = 30, opening height = 20, overlay at each outer edge (negative for inset) = 0.5, number of doors: 1 or 2 = 2, meeting gap for a pair = 0.125. Door width = 15.4375.

Before you use the result

Width = (opening + two outer overlays − pair gap) ÷ door count; height = opening + two overlays. Negative overlay models inset clearance. Confirm hinge and cabinet specifications separately.

Example results for opening width

These examples use Opening height: 20; Overlay at each outer edge (negative for inset): 0.5; Number of doors: 1 or 2: 2; Meeting gap for a pair: 0.125. They are reference calculations, not recommended settings.

Opening width	Door width
15	7.9375
30	15.4375
60	30.4375

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