1. What is a Wallpaper Calculator with Doors?

Definition: This calculator estimates the area of wallpaper needed for a wall while accounting for door space that won't be covered.

Purpose: It helps homeowners and interior designers accurately calculate wallpaper requirements, reducing waste and cost.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( A \) — Wallpaper area (square feet)
• \( H \) — Wall height (feet)
• \( W \) — Wall width (feet)
• \( Door_A \) — Door area (square feet)

Explanation: The total wall area is calculated first, then the door area is subtracted to get the actual wallpaper coverage area.

3. Importance of Accurate Wallpaper Calculation

Details: Proper calculation ensures you purchase the right amount of wallpaper, accounting for pattern repeats and minimizing waste.

4. Using the Calculator

Tips: Enter the wall height and width in feet, and door area (default 21 ft² for standard doors). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the standard door area?
A: Standard interior doors are about 21 ft² (3ft wide × 7ft tall), but measure your specific doors for accuracy.

Q2: Should I include windows in the calculation?
A: Yes, subtract window areas using the same method as doors for complete accuracy.

Q3: How much extra wallpaper should I buy?
A: Add 10-15% to the calculated area for pattern matching and mistakes.

Q4: What if my wall has multiple doors?
A: Sum the areas of all doors and enter the total in the door area field.

Q5: How do I measure wall height and width?
A: Measure from floor to ceiling for height, and the full length of the wall for width.