Wallpaper Calculator
Calculate rolls of wallpaper needed for your room.
Last updated: June 13, 2026
Calculator
Results
Includes 15% waste allowance
After subtracting openings
Before subtracting openings
How to Use This Calculator
- 1Enter the room length and width in feet.
- 2Enter the wall height (ceiling height).
- 3Enter number of doors and windows to subtract.
- 4Enter the wallpaper roll width and length.
- 5View total rolls needed including waste allowance.
Formula Explanation
Wall area minus openings, divided by the usable area per roll (accounting for pattern repeat waste), gives the number of rolls needed.
Variables:
Worked Examples
12×14 ft room, 8ft ceilings, 2 doors, 2 windows, standard rolls
- 1. Perimeter = 2×(12+14) = 52 ft
- 2. Wall area = 52 × 8 = 416 sq ft
- 3. Subtract openings: 2×21 + 2×15 = 72 sq ft
- 4. Net area = 344 sq ft
- 5. Standard roll covers ~28 sq ft usable
- 6. Rolls = 344 ÷ 28 = 12.3 → 13 rolls
Why Use This Calculator
- Avoid buying too many or too few rolls.
- Accounts for doors, windows, and waste.
- Save money by ordering the right quantity.
- Works with any roll size.
Tips & Best Practices
- Always buy 1-2 extra rolls for mistakes and future repairs.
- Wallpaper with patterns requires more material due to pattern matching.
- Order all rolls from the same batch/lot number to ensure color consistency.
- Measure twice before ordering — returns on opened rolls are rarely accepted.
Common Mistakes to Avoid
❌ Not accounting for pattern repeat waste.
✅ Patterned wallpaper can waste 15-25% of each roll for pattern matching. Add at least 10-15% extra to your order.
❌ Measuring only one wall and multiplying by 4.
✅ Rooms are rarely perfect squares. Measure each wall separately and calculate total perimeter for accuracy.
Frequently Asked Questions
How much does one roll of wallpaper cover?
Should I buy extra wallpaper rolls?
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<iframe src="https://redicalc.com/embed/home/wallpaper-calculator" width="100%" height="600" style="border:none;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,0.1);" title="Wallpaper Calculator — RediCalc.com" loading="lazy" allowtransparency="true"></iframe>Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.
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