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 the exact number of paint gallons required for any surface area, factoring in multiple coats and a configurable waste allowance. Useful for both DIY painters and professional contractors bidding jobs.

Total Wall Area (sq ft)

Doors & Windows Area (sq ft)

Number of Coats

Paint Coverage per Gallon

Waste Buffer

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	5
Result	Rolls needed (rolls)	Paint Needed (gallons)
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 the exact number of paint gallons required for any surface area, factoring in multiple coats and a configurable waste allowance. Useful for both DIY painters and professional contractors bidding jobs.