Cabinet Door Size Calculator

Calculate finished cabinet door dimensions for overlay-style mounting.

Door Size
— in (single)
Overlay style.

Usage Tip

Confirm your hinge style; full-overlay, half-overlay, and inset hinges each change how much the door should cover.

THE MATH
door width = opening width + 2 × overlay
door height = opening height + 2 × overlay
paired door = (door width − gap) ÷ 2
Overlay cabinet doors are larger than their opening so they cover the face frame. Each door grows by the overlay on both sides; a pair splits the width with a small gap between them.
Enter the opening width and height, the overlay per side (1/2 inch is common), and the gap for paired doors.
The single-door size is shown; the pair figure is each of two doors.
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.