How to Measure for Wallpaper
Accurate measurements are the key to a successful wallpaper project. Measure each wall individually rather than using room dimensions, because walls in the same room can vary in height due to uneven floors or ceilings.
- Measure wall width from corner to corner at the widest point. Round up to the nearest half foot.
- Measure wall height from floor to ceiling (or to where the wallpaper will stop). Include any extra for trimming — typically 2–4 inches top and bottom.
- Measure each opening — doors, windows, fireplaces, built-ins. Record width and height.
- Note the pattern repeat from the wallpaper label. This is the vertical distance before the pattern repeats.
Wallpaper Roll Sizes Explained
Wallpaper rolls come in several standard sizes. Understanding these helps you compare prices and calculate coverage accurately:
| Roll Type | Width | Length | Coverage |
|---|---|---|---|
| US Standard Single | 20.5" | 33 ft | 56.4 sq ft |
| US Standard Double | 20.5" | 66 ft | 112.8 sq ft |
| Euro Standard | 21" | 33 ft | 57.8 sq ft |
| Wide Width | 27" | 27 ft | 60.8 sq ft |
| Metric | 20.9" | 33 ft | 57.5 sq ft |
| Wide Metric | 27.6" | 33 ft | 75.9 sq ft |
Understanding Pattern Repeat
Pattern repeat is one of the most misunderstood aspects of wallpaper. It directly affects how much wallpaper you need:
No Repeat / Random
Solid colors, textures, or random patterns. No matching needed between strips. Most efficient — minimal waste.
Straight Match
Pattern aligns horizontally at the same height on each strip. Moderate waste — depends on repeat length.
Half-Drop Match
Pattern on adjacent strips is offset by half the repeat distance. More waste than straight match. Common in diamond and diagonal patterns.
Large Repeat (18"+)
Large-scale patterns with 18–24 inch repeats. Can waste 20–30% more wallpaper. Budget extra rolls accordingly.
DIY Wallpaper Installation Tips
- Prep the walls. Walls must be clean, smooth, and primed. Fill holes, sand rough spots, and apply wallpaper primer. This ensures proper adhesion and easier removal later.
- Start from a plumb line. Use a level to draw a perfectly vertical line on your starting wall. Don't trust corners — they're rarely perfectly plumb.
- Book the paste. After applying paste, fold the wallpaper paste-to-paste (called "booking") and let it rest 5–10 minutes. This allows the paper to expand evenly and prevents bubbles.
- Work from the center out. When smoothing each strip, start from the center and work outward with a wallpaper brush or smoother to push out air bubbles.
- Overlap at corners. Never try to wrap a full strip around a corner. Instead, cut the strip to wrap 1 inch around the corner, then start the next strip overlapping that inch.
- Use sharp blades. Change your razor blade every 2–3 cuts. A dull blade tears wet wallpaper and creates ragged edges.
Wallpaper Types & Materials
- Vinyl — Most durable and washable. Great for kitchens, bathrooms, and high-traffic areas. Easy to install and remove.
- Non-Woven — Breathable, tear-resistant, and paste-the-wall application. Strips come off cleanly. Excellent for DIY.
- Pre-Pasted — Adhesive is pre-applied. Just activate with water. Convenient but may not stick as well long-term.
- Peel-and-Stick — Removable and repositionable. Perfect for renters. No paste or water needed. Less durable than traditional options.
- Grasscloth — Natural woven fibers. Textured, eco-friendly, and luxurious. Harder to install and not washable.
- Flocked — Raised velvet-like texture. Dramatic and elegant. Delicate — not suitable for high-moisture areas.
Frequently Asked Questions
How many rolls of wallpaper do I need for a room?
Measure each wall's width and height in feet, multiply to get square footage, then subtract doors and windows. Divide the net area by the usable square footage per roll (typically 56 sq ft for a US single roll). Add 10% for waste. For example, a 12×10 room with 8-ft ceilings has about 352 sq ft of wall area. After subtracting openings (~50 sq ft), you'd need roughly 6 single rolls.
What is a pattern repeat and how does it affect wallpaper?
Pattern repeat is the vertical distance between where the pattern starts repeating. A larger repeat means more waste because you need to align patterns between strips. A 12-inch repeat can waste 10-15% more wallpaper, while a 24-inch repeat can waste 20-25% more. Random or no-match patterns have zero repeat waste.
What's the difference between a single and double roll?
A US single roll covers about 56 sq ft (20.5" wide × 33 ft long). A double roll covers about 113 sq ft (20.5" wide × 66 ft long). Most wallpaper is actually sold in double rolls but priced per single roll. Double rolls are more efficient because they produce less waste from fewer seams.
How much does wallpaper cost?
Wallpaper ranges from $20-40 per single roll for basic patterns, $40-80 for mid-range designer options, and $80-200+ for luxury or hand-printed wallpaper. Professional installation adds $25-75 per roll. Budget $1-3 per square foot for materials and $2-5 per square foot installed.
Should I buy extra wallpaper?
Always buy 10-15% extra. Wallpaper is produced in dye lots — if you run short, the next batch may have slight color differences. Extra rolls are also essential for future repairs. Most retailers allow returns of unopened rolls within 30-60 days.
Privacy and Performance
All wallpaper calculations run entirely in your browser. No data is sent to any server. Results update instantly as you adjust dimensions and options. This tool works on desktop, tablet, and mobile devices. Estimates are for planning purposes — always verify with your wallpaper supplier.