Drywall Mud Calculator

There are three main types of joint compound:

• All-Purpose (Pre-Mixed) - Best for DIYers. Ready to use, easy to sand, good for all coats. Dries by evaporation (24 hours between coats).
• Lightweight (Pre-Mixed) - Similar to all-purpose but 25-35% lighter. Easier to sand and less likely to shrink. Great for topcoats.
• Setting-Type (Powder) - Mix with water. Sets by chemical reaction in 20-90 minutes. Stronger bond, less shrinkage. Best for first coat and repairs.

The number of coats depends on the finish level desired:

• 2 coats - Minimum for basic finish. Tape coat plus one finish coat.
• 3 coats - Standard finish. Tape coat, filler coat, and skim coat. Suitable for most residential work.
• 4 coats - Level 5 finish. Adds full skim coat over entire surface. Required for glossy paints or critical lighting.

Each coat should be wider than the previous, feathering 2-3 inches beyond.

Both have their uses:

• Paper Tape - Stronger, less likely to crack. Best for corners and flat joints. Requires bedding compound underneath.
• Mesh Tape - Self-adhesive, faster to apply. Good for flat joints and repairs. Must be used with setting-type compound for best results.

Professionals typically prefer paper tape for durability, while mesh tape is popular for DIY projects due to ease of use.

This calculator estimates joints based on standard drywall patterns:

• Horizontal seams every 4 feet of wall height
• Vertical seams based on sheet width (4 ft)
• Additional for inside/outside corners

General rule: Expect about 1.5-2 linear feet of joints per square foot of drywall, including butt joints and factory edges.

Pre-mixed joint compound typically comes in these sizes:

• 1 gallon - Small repairs and touch-ups
• 3.5 gallon bucket - Most common, good for 1-2 rooms
• 5 gallon bucket - Larger projects, better value

This calculator recommends 3.5-gallon buckets as they're the most practical for most projects.