Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Wallpaper Calculator (Rolls per Room)

Estimate how many rolls of wallpaper you need for a room, including a waste allowance for pattern match and trimming. Works with US double rolls and European standard rolls.

Total wall area (sq ft)

Waste allowance (%)

Coverage per roll (sq ft/roll)

Fill in the required fields to see your result.

Construction

Paint Coverage Calculator

Calculate how many litres of paint you need for a job, given the area to cover, the number of coats, and the spread rate of your specific paint. Lets you order the right amount without overspending on excess or running short mid-coat.

Total Surface Area (m²)

Number of Coats (coats)

Paint Coverage per Liter (m²/L)

Fill in the required fields to see your result.

Key differences

	Wallpaper Calculator (Rolls per Room)	Paint Coverage Calculator
Category	Construction	Construction
Inputs required	3	3
Result	Rolls needed (rolls)	Paint Required (liters)
What it does	Estimate how many rolls of wallpaper you need for a room, including a waste allowance for pattern match and trimming. Works with US double rolls and European standard rolls.	Calculate how many litres of paint you need for a job, given the area to cover, the number of coats, and the spread rate of your specific paint. Lets you order the right amount without overspending on excess or running short mid-coat.