免费门洞粗开口计算器

根据门的尺寸计算所需的粗开口尺寸。

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Rough Opening Width

38.00 in

RO Width in Feet3.17 ft
RO Height in Feet6.83 ft

Rough Opening Width vs Door Width

查看公式 →

公式

## How to Calculate a Door Rough Opening ### Formula **RO Width = Door Width + 2 x Side Gap** **RO Height = Door Height + Top Gap + Threshold Allowance** The side shim gap (typically 1 inch per side) gives room for the door jamb and shims. The top gap allows clearance for the head jamb. The threshold allowance accounts for the finished floor and threshold assembly. ### Standard Sizes Most interior doors are 80 inches tall. Common widths are 24, 28, 30, 32, and 36 inches. Exterior doors may be 36 inches wide and 80 or 96 inches tall.

计算示例

A standard 36-inch wide by 80-inch tall door with 1-inch side gaps, 0.5-inch top gap, and 1.5-inch threshold allowance.

  1. 01RO Width = 36 + 2 x 1 = 38 inches
  2. 02RO Height = 80 + 0.5 + 1.5 = 82 inches
  3. 03The framed opening should be 38 in wide by 82 in tall.