Drywall Texture Coverage Calculator

Drywall texture adds visual interest and hides imperfections in walls and ceilings. Different texture styles require different amounts of material and have different coverage rates.

Common texture styles and coverage rates:

One container means either a 20 kg (44 lb) bag of powder or a 5 US gallon bucket of premixed. That looks like a coincidence and it is not: a 20 kg bag of texture powder mixed to spray consistency makes roughly 5 gallons of material, which is why the two containers land on the same coverage figures. Buy whichever your store stocks. Powder is cheaper and keeps; premixed saves you a mixing paddle and a half hour.

Formula: Material needed = Total area / Coverage rate per container

What each variable means:

• Total area: wall or ceiling area to texture (subtract windows and doors)
• Texture style: determines how thickly material is applied
• Application method: spray covers differently than hand-trowel

When to use this calculator:

• Planning a texturing project for new construction or renovation
• Estimating material costs before starting
• Determining how many bags or buckets to purchase
• Comparing material needs across different texture styles

Practical example: A room measuring 4 m × 5 m (13 × 16 ft) with 2.5 m (8 ft) ceilings has a wall perimeter of 18 m, so 18 × 2.5 = 45 m² (485 ft²) of wall, minus about 4 m² (43 ft²) for a door and a window. Call it 41 m².

For knockdown by hand, at 18 m² per container: 41 × 1.10 for waste = 45.1 m², divided by 18 = 2.5, so 3 containers. Switch that to spray on a ceiling and coverage drops to 13.5 m² per container, and you are buying 4.

Tips:

• Always buy 10 to 15% extra material to account for waste and touch-ups.
• Practice your texture pattern on scrap drywall before doing the actual walls. This one is not optional advice. Knockdown in particular has a timing window of a few minutes, and the only way to learn it is to get it wrong on something that does not matter.
• Prime the drywall before texturing for better adhesion and uniform appearance.
• Temperature affects drying time. Apply between 10 and 30°C (50 to 86°F).
• Spray application is faster but uses noticeably more material, because a hopper gun throws some of every pass past the wall.
• Ceilings need more than walls. Gravity pulls a wet ceiling texture back at you, so you end up applying heavier to make it hold.