Wallpaper Calculator Guide: How Much Wallpaper Do You Need?
Are you ready to transform your room with fresh wallpaper, but unsure how many rolls you actually need? This guide will walk you through everything—from measuring your walls to calculating the right number of rolls, including practical tips for small bathrooms, feature walls, and more. Let’s make sure you order just the right amount—no waste, no frustration!
How to Calculate How Much Wallpaper You Need
Choosing the perfect wallpaper is only half the job—the other half is making sure you order the correct amount. Too little wallpaper can delay your project; too much wastes money and storage space. Here’s a step-by-step guide to help you get it right.
Step 1: Measure Your Walls
Use a tape measure to note the height and width of each wall you want to cover. Write these measurements down in metres (m) or feet (ft), depending on your preference.
- For all four walls: Add the widths of each wall together, then multiply by the height.
- For a feature wall: Only measure the width and height of the wall you want to cover.
Tip: Remember to subtract the area of large windows and doors if you want to be precise.
Step 2: Calculate Total Wall Area
Multiply the total width by the height to get the total area (in square metres or square feet).
- Example:
- Width: 10m (32.8ft)
- Height: 2.4m (7.87ft)
- Total area: 10m x 2.4m = 24m² (32.8ft x 7.87ft ≈ 258ft²)
Step 3: Check the Wallpaper Roll Coverage
Wallpaper rolls vary in size, but a standard roll typically covers about 5.2m² (56ft²). Always check the label for exact dimensions.
| Roll Size | Metric Coverage (approx) | Imperial Coverage (approx) |
|---|---|---|
| Standard UK Roll | 0.52m x 10m | 21in x 33ft |
| Coverage | 5.2m² | 56ft² |
Step 4: Divide Wall Area by Roll Coverage
Divide your total wall area by the coverage of one roll to find out how many rolls you need.
Formula:
Number of rolls = Total wall area ÷ Roll coverage
- Example continued:
- Wall area: 24m²
- Roll covers: 5.2m²
- 24 ÷ 5.2 = 4.62 rolls
- Always round up, so you’ll need 5 rolls.
Step 5: Account for Pattern Repeat and Wastage
If your wallpaper has a pattern repeat (where the design matches up), you will need extra to account for matching. Check the pattern repeat on the roll's label and add 10–15% extra, especially for large or bold patterns.
For plain or small-repeat designs, 10% extra is usually sufficient.
Step 6: Use a Wallpaper Calculator for Fast Results
If you’d rather avoid the maths, try our wallpaper calculator for quick, accurate results. Just enter your measurements and it will do the rest!
Worked Example (Metric and Imperial)
You want to wallpaper a room that is 12ft by 12ft (3.66m x 3.66m) with a standard 8ft ceiling (2.44m).
- Step 1: Find total wall width. Four walls, each 12ft wide = 48ft (or 4 x 3.66m = 14.64m)
- Step 2: Multiply by height. 48ft x 8ft = 384ft² (14.64m x 2.44m = 35.73m²)
- Step 3: Standard roll covers 56ft² (5.2m²)
- Step 4: 384 ÷ 56 = 6.86 rolls (35.73 ÷ 5.2 = 6.87 rolls)
- Step 5: Round up and allow for pattern repeat. Buy 8 rolls to be safe.
Tips for Different Room Types
- Small bathrooms: Subtract windows and doors. Add extra if walls are uneven.
- Feature walls: Only measure the wall you want to cover.
- Rooms with unusual shapes: Break your measurements into sections and add them up.
How Much Wallpaper Paste or Adhesive Do You Need?
Most wallpaper pastes will state the coverage per pack. As a rule, one standard packet covers 5–7 rolls, but always check the instructions for your chosen brand and type of wallpaper.
Questions People Are Actually Asking
How much wallpaper do I need?
Measure the total wall area (width x height), subtract windows/doors, then divide by the coverage per roll. Always round up to the nearest whole roll and add extra for pattern matching.
How much wallpaper for a small bathroom?
Measure each wall’s width and height, subtract the area of windows and large fixtures, then follow the main calculation steps. Bathrooms often need 2–4 rolls, but always check your measurements.
How much wallpaper paste do I need?
One standard packet of wallpaper paste usually covers 5–7 rolls. Check your wallpaper’s label and the paste brand’s guidance, as some heavy wallpapers may require more paste.
How much wallpaper adhesive do I need?
Adhesive requirements are similar to paste. For most rooms, one large tub or two small packets will suffice for a typical project of 5–8 rolls. Always check product instructions for coverage specifics.
How much wallpaper for one wall?
Measure the width and height of that wall, multiply to get the area, then divide by the coverage per roll. Most standard feature walls need 1–2 rolls, depending on size and pattern.
How much wallpaper for a 10x10 room?
A 10ft x 10ft room with an 8ft ceiling has a total wall area of 320ft² (29.6m²). With standard rolls covering 56ft² (5.2m²), you’ll need 6–7 rolls, plus a bit more for pattern matching.
How much wallpaper is in a roll?
A typical UK roll measures 0.52m x 10m (21in x 33ft), covering around 5.2m² (56ft²). Always check the packaging for exact measurements.
How much wallpaper for a 12x12 room?
A 12ft x 12ft room with an 8ft ceiling has a total wall area of 384ft² (35.7m²). This usually requires 7–8 rolls, allowing for pattern repeat and wastage.
Conclusion
Calculating wallpaper doesn’t need to be a headache. With a tape measure, a bit of maths, and the right tips, you can order exactly what you need—no more, no less. Ready to get started? Use our handy wallpaper calculator to check your measurements and order with confidence!
Free tools to put this into practice
Reading is one thing — working out your own numbers is what saves time and money. Here are the free HowMuchDoINeed calculators that pair best with this guide:
- Wallpaper Calculator — work out exactly how much you need and what it will cost.
- Paint Calculator — work out exactly how much you need and what it will cost.
- Retaining Wall Calculator — work out exactly how much you need and what it will cost.
Explore every free calculator on HowMuchDoINeed — no sign-up required.