To calculate how many rolls of wallpaper with the pattern you need, you need the following sizes:

- Height and width of the wall
- Width and length of the roll
- Length of the pattern

We will explain the calculation with the roll with design Savannah Palmtree.

- The wall is 390 cm long and 265 high.
- The roll is 70 cm wide and 10 meter long.
- The pattern length is 55,58 cm, this means that the pattern repeats itself every 55,58 cm.

**Step 1: Calculate the amount of lanes needed.**

To do this you have to calculate the width of the wall, divide by the width of the roll.

- Width wall: 360 cm
- Width roll: 70 cm

Always round up the result.

*360 cm (**width of the wall): 70 cm (**width of roll) = 5,14 **lane, rounded up you need 6 lanes. *

**Step 2: Calculate the pattern per roll**

Divide the length of the roll by the repeat of the pattern and round the outcome down.

*10 meter (=1000cm; len**gth rol**l) : 55,58 cm (**repeat of the pattern) =17,99 pa**tterns*

In this example you will therefore get 17 patterns from 1 roll of wallpaper.

**St****ep 3: ****Calculate amount of patterns per lane**

Divide the height of the wall by the repeat of the pattern. Round up the result.

260 cm (height wall): 55,58 cm (repeat of the pattern) = 4.67 pattern

Rounded up; it will be 5 patterns per lane.

**Step 4: The amount of lanes you get out of a roll.**

Divide the amount of patterns per roll (outcome of step 2) by the amount of patterns per lane (outcome step 3) and round down the result.

*17 patterns (on the roll): 5 patterns (per lane) = 3,4 lanes*

*So you get 3 lanes out of 1 roll.*

**Step 5: The amount of rolls needed = outcome**

We are now at the final step since we have the needed information.

You need 6 lanes for your wall (outcome step 1)

You get 3 lanes out of 1 roll (outcome step 4) * *

Divide the outcome of step 1 by the outcome of step 4 and round up the result. This will give you the correct amount off rolls.

6 lanes (total amount of lanes) : 3 lanes (amount of lanes per roll) = 2 rolls