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A door size calculator determines rough opening dimensions, jamb sizes, and trim requirements for interior and exterior doors. Standard interior doors are 80×32 inches; exterior doors are typically 80×36 inches. Rough openings should be 2 inches wider and 2.5 inches taller than the door size.

Οδηγός βήμα προς βήμα

1. 1Input base values
2. 2System computes results

Worked Examples

Common Mistakes to Avoid

• ✕Precision loss
• ✕Ignoring variables

Frequently Asked Questions