Wallpaper Roll Calculator
Korean paper-backed rolls are 93 cm wide and silk 106 cm, at roughly 15.6 m per roll. The headline figure already includes a 10% allowance.
Your numbers
Rolls needed
3rolls
Area
16.54m²
Count
3rolls
Formula
Rolls needed = Area ÷ (Roll width (cm) ÷ 100 × Roll length (m))
Patterned paper wastes more because repeats must line up — allow 20% or more for large patterns.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Area (m²)The space a shape covers — length squared. | 45 | 0 and up |
| Roll width (cm)How wide one roll is — commonly 53 cm or 106 cm. | 106 | 10 and up |
| Roll length (m)How long one roll of wallpaper runs. | 15.6 | 0.5 and up |
Step by step
Quick reference table
Results when only Area (m²) changes and everything else stays put.
| Area (m²) | Rolls needed (rolls) | Area (m²) | Count (rolls) |
|---|---|---|---|
| 22.5 | 2 | 16.54 | 2 |
| 33.8 | 3 | 16.54 | 3 |
| 45 | 3 | 16.54 | 3 |
| 67.5 | 5 | 16.54 | 5 |
| 90 | 6 | 16.54 | 6 |
What each result means
| Result | At default values |
|---|---|
| Rolls needed (rolls)Rolls needed; matching a pattern eats more. | 3 |
| Area (m²)The space a shape covers — length squared. | 16.54 |
| Count (rolls)A plain count of items; it often ends up as the denominator. | 3 |
Common mistakes
Patterned paper wastes more because repeats must line up — allow 20% or more for large patterns.
Glossary
- Area
- The space a shape covers — length squared.
- Roll width (cm)
- How wide one roll is — commonly 53 cm or 106 cm.
- Roll length (m)
- How long one roll of wallpaper runs.
- Rolls needed
- Rolls needed; matching a pattern eats more.
- Count
- A plain count of items; it often ends up as the denominator.
Frequently asked questions
Q. How is Wallpaper Roll Calculator calculated?
Rolls needed = Area ÷ (Roll width (cm) ÷ 100 × Roll length (m)) — Korean paper-backed rolls are 93 cm wide and silk 106 cm, at roughly 15.6 m per roll. The headline figure already includes a 10% allowance.
Q. Can you walk through an example?
With Area 45m², Roll width (cm) 106, Roll length (m) 15.6, the answer is Rolls needed 3rolls.
Q. What do I need to enter?
Enter Area, Roll width (cm), Roll length (m). The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Area (m²) moves the answer to Area (m²) 22.5 → Rolls needed (rolls) 2 and Area (m²) 90 → Rolls needed (rolls) 6. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Patterned paper wastes more because repeats must line up — allow 20% or more for large patterns.
Related calculators
Keep your length units consistent across inputs — mixing centimetres and metres throws results far off.